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<h2>Table of Contents</h2>
<ul>
<li><span class="stability_undefined"><a href="#errors_errors">Errors</a></span><ul>
<li><span class="stability_undefined"><a href="#errors_error_propagation_and_interception">Error Propagation and Interception</a></span><ul>
<li><span class="stability_undefined"><a href="#errors_error_first_callbacks">Error-first callbacks</a></span></li>
</ul>
</li>
<li><span class="stability_undefined"><a href="#errors_class_error">Class: Error</a></span><ul>
<li><span class="stability_undefined"><a href="#errors_new_error_message">new Error(message)</a></span></li>
<li><span class="stability_undefined"><a href="#errors_error_capturestacktrace_targetobject_constructoropt">Error.captureStackTrace(targetObject[, constructorOpt])</a></span></li>
<li><span class="stability_undefined"><a href="#errors_error_stacktracelimit">Error.stackTraceLimit</a></span></li>
<li><span class="stability_undefined"><a href="#errors_error_code">error.code</a></span></li>
<li><span class="stability_undefined"><a href="#errors_error_message">error.message</a></span></li>
<li><span class="stability_undefined"><a href="#errors_error_stack">error.stack</a></span></li>
</ul>
</li>
<li><span class="stability_undefined"><a href="#errors_class_assertionerror">Class: AssertionError</a></span></li>
<li><span class="stability_undefined"><a href="#errors_class_rangeerror">Class: RangeError</a></span></li>
<li><span class="stability_undefined"><a href="#errors_class_referenceerror">Class: ReferenceError</a></span></li>
<li><span class="stability_undefined"><a href="#errors_class_syntaxerror">Class: SyntaxError</a></span></li>
<li><span class="stability_undefined"><a href="#errors_class_typeerror">Class: TypeError</a></span></li>
<li><span class="stability_undefined"><a href="#errors_exceptions_vs_errors">Exceptions vs. Errors</a></span></li>
<li><span class="stability_undefined"><a href="#errors_system_errors">System Errors</a></span><ul>
<li><span class="stability_undefined"><a href="#errors_class_system_error">Class: System Error</a></span><ul>
<li><span class="stability_undefined"><a href="#errors_error_code_1">error.code</a></span></li>
<li><span class="stability_undefined"><a href="#errors_error_errno">error.errno</a></span></li>
<li><span class="stability_undefined"><a href="#errors_error_syscall">error.syscall</a></span></li>
<li><span class="stability_undefined"><a href="#errors_error_path">error.path</a></span></li>
<li><span class="stability_undefined"><a href="#errors_error_address">error.address</a></span></li>
<li><span class="stability_undefined"><a href="#errors_error_port">error.port</a></span></li>
</ul>
</li>
<li><span class="stability_undefined"><a href="#errors_common_system_errors">Common System Errors</a></span></li>
</ul>
</li>
<li><span class="stability_undefined"><a href="#errors_node_js_error_codes">Node.js Error Codes</a></span><ul>
<li><span class="stability_undefined"><a href="#errors_err_arg_not_iterable">ERR_ARG_NOT_ITERABLE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_async_callback">ERR_ASYNC_CALLBACK</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_async_type">ERR_ASYNC_TYPE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_encoding_invalid_encoded_data">ERR_ENCODING_INVALID_ENCODED_DATA</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_encoding_not_supported">ERR_ENCODING_NOT_SUPPORTED</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_falsy_value_rejection">ERR_FALSY_VALUE_REJECTION</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http_headers_sent">ERR_HTTP_HEADERS_SENT</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http_invalid_char">ERR_HTTP_INVALID_CHAR</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http_invalid_status_code">ERR_HTTP_INVALID_STATUS_CODE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http_trailer_invalid">ERR_HTTP_TRAILER_INVALID</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_already_shutdown">ERR_HTTP2_ALREADY_SHUTDOWN</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_altsvc_invalid_origin">ERR_HTTP2_ALTSVC_INVALID_ORIGIN</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_altsvc_length">ERR_HTTP2_ALTSVC_LENGTH</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_connect_authority">ERR_HTTP2_CONNECT_AUTHORITY</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_connect_path">ERR_HTTP2_CONNECT_PATH</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_connect_scheme">ERR_HTTP2_CONNECT_SCHEME</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_frame_error">ERR_HTTP2_FRAME_ERROR</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_goaway_session">ERR_HTTP2_GOAWAY_SESSION</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_header_required">ERR_HTTP2_HEADER_REQUIRED</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_header_single_value">ERR_HTTP2_HEADER_SINGLE_VALUE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_headers_after_respond">ERR_HTTP2_HEADERS_AFTER_RESPOND</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_headers_object">ERR_HTTP2_HEADERS_OBJECT</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_headers_sent">ERR_HTTP2_HEADERS_SENT</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_info_headers_after_respond">ERR_HTTP2_INFO_HEADERS_AFTER_RESPOND</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_info_status_not_allowed">ERR_HTTP2_INFO_STATUS_NOT_ALLOWED</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_invalid_connection_headers">ERR_HTTP2_INVALID_CONNECTION_HEADERS</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_invalid_header_value">ERR_HTTP2_INVALID_HEADER_VALUE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_invalid_info_status">ERR_HTTP2_INVALID_INFO_STATUS</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_invalid_origin">ERR_HTTP2_INVALID_ORIGIN</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_invalid_packed_settings_length">ERR_HTTP2_INVALID_PACKED_SETTINGS_LENGTH</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_invalid_pseudoheader">ERR_HTTP2_INVALID_PSEUDOHEADER</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_invalid_session">ERR_HTTP2_INVALID_SESSION</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_invalid_setting_value">ERR_HTTP2_INVALID_SETTING_VALUE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_invalid_stream">ERR_HTTP2_INVALID_STREAM</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_max_pending_settings_ack">ERR_HTTP2_MAX_PENDING_SETTINGS_ACK</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_nested_push">ERR_HTTP2_NESTED_PUSH</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_no_socket_manipulation">ERR_HTTP2_NO_SOCKET_MANIPULATION</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_origin_length">ERR_HTTP2_ORIGIN_LENGTH</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_out_of_streams">ERR_HTTP2_OUT_OF_STREAMS</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_payload_forbidden">ERR_HTTP2_PAYLOAD_FORBIDDEN</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_ping_cancel">ERR_HTTP2_PING_CANCEL</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_ping_length">ERR_HTTP2_PING_LENGTH</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_pseudoheader_not_allowed">ERR_HTTP2_PSEUDOHEADER_NOT_ALLOWED</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_push_disabled">ERR_HTTP2_PUSH_DISABLED</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_send_file">ERR_HTTP2_SEND_FILE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_session_error">ERR_HTTP2_SESSION_ERROR</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_settings_cancel">ERR_HTTP2_SETTINGS_CANCEL</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_socket_bound">ERR_HTTP2_SOCKET_BOUND</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_socket_unbound">ERR_HTTP2_SOCKET_UNBOUND</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_status_101">ERR_HTTP2_STATUS_101</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_status_invalid">ERR_HTTP2_STATUS_INVALID</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_stream_cancel">ERR_HTTP2_STREAM_CANCEL</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_stream_error">ERR_HTTP2_STREAM_ERROR</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_stream_self_dependency">ERR_HTTP2_STREAM_SELF_DEPENDENCY</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_trailers_already_sent">ERR_HTTP2_TRAILERS_ALREADY_SENT</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_trailers_not_ready">ERR_HTTP2_TRAILERS_NOT_READY</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_http2_unsupported_protocol">ERR_HTTP2_UNSUPPORTED_PROTOCOL</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_index_out_of_range">ERR_INDEX_OUT_OF_RANGE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_invalid_arg_type">ERR_INVALID_ARG_TYPE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_invalid_async_id">ERR_INVALID_ASYNC_ID</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_invalid_callback">ERR_INVALID_CALLBACK</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_invalid_file_url_host">ERR_INVALID_FILE_URL_HOST</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_invalid_file_url_path">ERR_INVALID_FILE_URL_PATH</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_invalid_handle_type">ERR_INVALID_HANDLE_TYPE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_invalid_opt_value">ERR_INVALID_OPT_VALUE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_invalid_performance_mark">ERR_INVALID_PERFORMANCE_MARK</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_invalid_protocol">ERR_INVALID_PROTOCOL</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_invalid_sync_fork_input">ERR_INVALID_SYNC_FORK_INPUT</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_invalid_this">ERR_INVALID_THIS</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_invalid_tuple">ERR_INVALID_TUPLE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_invalid_url">ERR_INVALID_URL</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_invalid_url_scheme">ERR_INVALID_URL_SCHEME</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_ipc_channel_closed">ERR_IPC_CHANNEL_CLOSED</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_ipc_disconnected">ERR_IPC_DISCONNECTED</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_ipc_one_pipe">ERR_IPC_ONE_PIPE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_ipc_sync_fork">ERR_IPC_SYNC_FORK</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_missing_args">ERR_MISSING_ARGS</a></span></li>
<li><span class="stability_1"><a href="#errors_err_missing_dynamic_instantiate_hook">ERR_MISSING_DYNAMIC_INSTANTIATE_HOOK</a></span></li>
<li><span class="stability_1"><a href="#errors_err_missing_module">ERR_MISSING_MODULE</a></span></li>
<li><span class="stability_1"><a href="#errors_err_module_resolution_legacy">ERR_MODULE_RESOLUTION_LEGACY</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_multiple_callback">ERR_MULTIPLE_CALLBACK</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_napi_cons_function">ERR_NAPI_CONS_FUNCTION</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_napi_cons_prototype_object">ERR_NAPI_CONS_PROTOTYPE_OBJECT</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_napi_invalid_dataview_args">ERR_NAPI_INVALID_DATAVIEW_ARGS</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_napi_invalid_typedarray_alignment">ERR_NAPI_INVALID_TYPEDARRAY_ALIGNMENT</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_napi_invalid_typedarray_length">ERR_NAPI_INVALID_TYPEDARRAY_LENGTH</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_napi_tsfn_call_js">ERR_NAPI_TSFN_CALL_JS</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_napi_tsfn_get_undefined">ERR_NAPI_TSFN_GET_UNDEFINED</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_napi_tsfn_start_idle_loop">ERR_NAPI_TSFN_START_IDLE_LOOP</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_napi_tsfn_stop_idle_loop">ERR_NAPI_TSFN_STOP_IDLE_LOOP</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_no_icu">ERR_NO_ICU</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_socket_already_bound">ERR_SOCKET_ALREADY_BOUND</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_socket_bad_port">ERR_SOCKET_BAD_PORT</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_socket_bad_type">ERR_SOCKET_BAD_TYPE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_socket_cannot_send">ERR_SOCKET_CANNOT_SEND</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_socket_closed">ERR_SOCKET_CLOSED</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_socket_dgram_not_running">ERR_SOCKET_DGRAM_NOT_RUNNING</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_stderr_close">ERR_STDERR_CLOSE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_stdout_close">ERR_STDOUT_CLOSE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_tls_cert_altname_invalid">ERR_TLS_CERT_ALTNAME_INVALID</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_tls_dh_param_size">ERR_TLS_DH_PARAM_SIZE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_tls_handshake_timeout">ERR_TLS_HANDSHAKE_TIMEOUT</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_tls_renegotiation_failed">ERR_TLS_RENEGOTIATION_FAILED</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_tls_required_server_name">ERR_TLS_REQUIRED_SERVER_NAME</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_tls_session_attack">ERR_TLS_SESSION_ATTACK</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_transform_already_transforming">ERR_TRANSFORM_ALREADY_TRANSFORMING</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_transform_with_length_0">ERR_TRANSFORM_WITH_LENGTH_0</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_unknown_signal">ERR_UNKNOWN_SIGNAL</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_unknown_stdin_type">ERR_UNKNOWN_STDIN_TYPE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_unknown_stream_type">ERR_UNKNOWN_STREAM_TYPE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_v8breakiterator">ERR_V8BREAKITERATOR</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_valid_performance_entry_type">ERR_VALID_PERFORMANCE_ENTRY_TYPE</a></span></li>
<li><span class="stability_undefined"><a href="#errors_err_value_out_of_range">ERR_VALUE_OUT_OF_RANGE</a></span></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
<div id="apicontent">
<h1>Errors<span><a class="mark" href="#errors_errors" id="errors_errors">#</a></span></h1>
<!--introduced_in=v4.0.0-->
<!--type=misc-->
<p>Applications running in Node.js will generally experience four categories of
errors:</p>
<ul>
<li>Standard JavaScript errors such as:<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/EvalError" class="type"><EvalError></a> : thrown when a call to <code>eval()</code> fails.</li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SyntaxError" class="type"><SyntaxError></a> : thrown in response to improper JavaScript language
syntax.</li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RangeError" class="type"><RangeError></a> : thrown when a value is not within an expected range</li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ReferenceError" class="type"><ReferenceError></a> : thrown when using undefined variables</li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypeError" class="type"><TypeError></a> : thrown when passing arguments of the wrong type</li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/URIError" class="type"><URIError></a> : thrown when a global URI handling function is misused.</li>
</ul>
</li>
<li>System errors triggered by underlying operating system constraints such
as attempting to open a file that does not exist, attempting to send data
over a closed socket, etc;</li>
<li>And User-specified errors triggered by application code.</li>
<li>Assertion Errors are a special class of error that can be triggered whenever
Node.js detects an exceptional logic violation that should never occur. These
are raised typically by the <code>assert</code> module.</li>
</ul>
<p>All JavaScript and System errors raised by Node.js inherit from, or are
instances of, the standard JavaScript <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error" class="type"><Error></a> class and are guaranteed
to provide <em>at least</em> the properties available on that class.</p>
<h2>Error Propagation and Interception<span><a class="mark" href="#errors_error_propagation_and_interception" id="errors_error_propagation_and_interception">#</a></span></h2>
<!--type=misc-->
<p>Node.js supports several mechanisms for propagating and handling errors that
occur while an application is running. How these errors are reported and
handled depends entirely on the type of Error and the style of the API that is
called.</p>
<p>All JavaScript errors are handled as exceptions that <em>immediately</em> generate
and throw an error using the standard JavaScript <code>throw</code> mechanism. These
are handled using the <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/try...catch"><code>try / catch</code> construct</a> provided by the
JavaScript language.</p>
<pre><code class="lang-js">// Throws with a ReferenceError because z is undefined
try {
const m = 1;
const n = m + z;
} catch (err) {
// Handle the error here.
}
</code></pre>
<p>Any use of the JavaScript <code>throw</code> mechanism will raise an exception that
<em>must</em> be handled using <code>try / catch</code> or the Node.js process will exit
immediately.</p>
<p>With few exceptions, <em>Synchronous</em> APIs (any blocking method that does not
accept a <code>callback</code> function, such as <a href="fs.html#fs_fs_readfilesync_path_options"><code>fs.readFileSync</code></a>), will use <code>throw</code>
to report errors.</p>
<p>Errors that occur within <em>Asynchronous APIs</em> may be reported in multiple ways:</p>
<ul>
<li>Most asynchronous methods that accept a <code>callback</code> function will accept an
<code>Error</code> object passed as the first argument to that function. If that first
argument is not <code>null</code> and is an instance of <code>Error</code>, then an error occurred
that should be handled.</li>
</ul>
<!-- eslint-disable no-useless-return -->
<pre><code class="lang-js"> const fs = require('fs');
fs.readFile('a file that does not exist', (err, data) => {
if (err) {
console.error('There was an error reading the file!', err);
return;
}
// Otherwise handle the data
});
</code></pre>
<ul>
<li><p>When an asynchronous method is called on an object that is an <code>EventEmitter</code>,
errors can be routed to that object's <code>'error'</code> event.</p>
<pre><code class="lang-js">const net = require('net');
const connection = net.connect('localhost');
// Adding an 'error' event handler to a stream:
connection.on('error', (err) => {
// If the connection is reset by the server, or if it can't
// connect at all, or on any sort of error encountered by
// the connection, the error will be sent here.
console.error(err);
});
connection.pipe(process.stdout);
</code></pre>
</li>
<li><p>A handful of typically asynchronous methods in the Node.js API may still
use the <code>throw</code> mechanism to raise exceptions that must be handled using
<code>try / catch</code>. There is no comprehensive list of such methods; please
refer to the documentation of each method to determine the appropriate
error handling mechanism required.</p>
</li>
</ul>
<p>The use of the <code>'error'</code> event mechanism is most common for <a href="stream.html">stream-based</a>
and <a href="events.html#events_class_eventemitter">event emitter-based</a> APIs, which themselves represent a series of
asynchronous operations over time (as opposed to a single operation that may
pass or fail).</p>
<p>For <em>all</em> <code>EventEmitter</code> objects, if an <code>'error'</code> event handler is not
provided, the error will be thrown, causing the Node.js process to report an
unhandled exception and crash unless either: The <a href="domain.html"><code>domain</code></a> module is
used appropriately or a handler has been registered for the
<a href="process.html#process_event_uncaughtexception"><code>process.on('uncaughtException')</code></a> event.</p>
<pre><code class="lang-js">const EventEmitter = require('events');
const ee = new EventEmitter();
setImmediate(() => {
// This will crash the process because no 'error' event
// handler has been added.
ee.emit('error', new Error('This will crash'));
});
</code></pre>
<p>Errors generated in this way <em>cannot</em> be intercepted using <code>try / catch</code> as
they are thrown <em>after</em> the calling code has already exited.</p>
<p>Developers must refer to the documentation for each method to determine
exactly how errors raised by those methods are propagated.</p>
<h3>Error-first callbacks<span><a class="mark" href="#errors_error_first_callbacks" id="errors_error_first_callbacks">#</a></span></h3>
<!--type=misc-->
<p>Most asynchronous methods exposed by the Node.js core API follow an idiomatic
pattern referred to as an <em>error-first callback</em> (sometimes referred to as
a <em>Node.js style callback</em>). With this pattern, a callback function is passed
to the method as an argument. When the operation either completes or an error
is raised, the callback function is called with
the Error object (if any) passed as the first argument. If no error was
raised, the first argument will be passed as <code>null</code>.</p>
<pre><code class="lang-js">const fs = require('fs');
function errorFirstCallback(err, data) {
if (err) {
console.error('There was an error', err);
return;
}
console.log(data);
}
fs.readFile('/some/file/that/does-not-exist', errorFirstCallback);
fs.readFile('/some/file/that/does-exist', errorFirstCallback);
</code></pre>
<p>The JavaScript <code>try / catch</code> mechanism <strong>cannot</strong> be used to intercept errors
generated by asynchronous APIs. A common mistake for beginners is to try to
use <code>throw</code> inside an error-first callback:</p>
<pre><code class="lang-js">// THIS WILL NOT WORK:
const fs = require('fs');
try {
fs.readFile('/some/file/that/does-not-exist', (err, data) => {
// mistaken assumption: throwing here...
if (err) {
throw err;
}
});
} catch (err) {
// This will not catch the throw!
console.error(err);
}
</code></pre>
<p>This will not work because the callback function passed to <code>fs.readFile()</code> is
called asynchronously. By the time the callback has been called, the
surrounding code (including the <code>try { } catch (err) { }</code> block will have
already exited. Throwing an error inside the callback <strong>can crash the Node.js
process</strong> in most cases. If <a href="domain.html">domains</a> are enabled, or a handler has been
registered with <code>process.on('uncaughtException')</code>, such errors can be
intercepted.</p>
<h2>Class: Error<span><a class="mark" href="#errors_class_error" id="errors_class_error">#</a></span></h2>
<!--type=class-->
<p>A generic JavaScript <code>Error</code> object that does not denote any specific
circumstance of why the error occurred. <code>Error</code> objects capture a "stack trace"
detailing the point in the code at which the <code>Error</code> was instantiated, and may
provide a text description of the error.</p>
<p>For crypto only, <code>Error</code> objects will include the OpenSSL error stack in a
separate property called <code>opensslErrorStack</code> if it is available when the error
is thrown.</p>
<p>All errors generated by Node.js, including all System and JavaScript errors,
will either be instances of, or inherit from, the <code>Error</code> class.</p>
<h3>new Error(message)<span><a class="mark" href="#errors_new_error_message" id="errors_new_error_message">#</a></span></h3>
<div class="signature"><ul>
<li><code>message</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li>
</ul>
</div><p>Creates a new <code>Error</code> object and sets the <code>error.message</code> property to the
provided text message. If an object is passed as <code>message</code>, the text message
is generated by calling <code>message.toString()</code>. The <code>error.stack</code> property will
represent the point in the code at which <code>new Error()</code> was called. Stack traces
are dependent on <a href="https://github.com/v8/v8/wiki/Stack-Trace-API">V8's stack trace API</a>. Stack traces extend only to either
(a) the beginning of <em>synchronous code execution</em>, or (b) the number of frames
given by the property <code>Error.stackTraceLimit</code>, whichever is smaller.</p>
<h3>Error.captureStackTrace(targetObject[, constructorOpt])<span><a class="mark" href="#errors_error_capturestacktrace_targetobject_constructoropt" id="errors_error_capturestacktrace_targetobject_constructoropt">#</a></span></h3>
<div class="signature"><ul>
<li><code>targetObject</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a></li>
<li><code>constructorOpt</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function" class="type"><Function></a></li>
</ul>
</div><p>Creates a <code>.stack</code> property on <code>targetObject</code>, which when accessed returns
a string representing the location in the code at which
<code>Error.captureStackTrace()</code> was called.</p>
<pre><code class="lang-js">const myObject = {};
Error.captureStackTrace(myObject);
myObject.stack; // similar to `new Error().stack`
</code></pre>
<p>The first line of the trace will be prefixed with <code>${myObject.name}: ${myObject.message}</code>.</p>
<p>The optional <code>constructorOpt</code> argument accepts a function. If given, all frames
above <code>constructorOpt</code>, including <code>constructorOpt</code>, will be omitted from the
generated stack trace.</p>
<p>The <code>constructorOpt</code> argument is useful for hiding implementation
details of error generation from an end user. For instance:</p>
<pre><code class="lang-js">function MyError() {
Error.captureStackTrace(this, MyError);
}
// Without passing MyError to captureStackTrace, the MyError
// frame would show up in the .stack property. By passing
// the constructor, we omit that frame, and retain all frames below it.
new MyError().stack;
</code></pre>
<h3>Error.stackTraceLimit<span><a class="mark" href="#errors_error_stacktracelimit" id="errors_error_stacktracelimit">#</a></span></h3>
<div class="signature"><ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a></li>
</ul>
</div><p>The <code>Error.stackTraceLimit</code> property specifies the number of stack frames
collected by a stack trace (whether generated by <code>new Error().stack</code> or
<code>Error.captureStackTrace(obj)</code>).</p>
<p>The default value is <code>10</code> but may be set to any valid JavaScript number. Changes
will affect any stack trace captured <em>after</em> the value has been changed.</p>
<p>If set to a non-number value, or set to a negative number, stack traces will
not capture any frames.</p>
<h3>error.code<span><a class="mark" href="#errors_error_code" id="errors_error_code">#</a></span></h3>
<div class="signature"><ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li>
</ul>
</div><p>The <code>error.code</code> property is a string label that identifies the kind of error.
See <a href="#nodejs-error-codes">Node.js Error Codes</a> for details about specific codes.</p>
<h3>error.message<span><a class="mark" href="#errors_error_message" id="errors_error_message">#</a></span></h3>
<div class="signature"><ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li>
</ul>
</div><p>The <code>error.message</code> property is the string description of the error as set by
calling <code>new Error(message)</code>. The <code>message</code> passed to the constructor will also
appear in the first line of the stack trace of the <code>Error</code>, however changing
this property after the <code>Error</code> object is created <em>may not</em> change the first
line of the stack trace (for example, when <code>error.stack</code> is read before this
property is changed).</p>
<pre><code class="lang-js">const err = new Error('The message');
console.error(err.message);
// Prints: The message
</code></pre>
<h3>error.stack<span><a class="mark" href="#errors_error_stack" id="errors_error_stack">#</a></span></h3>
<div class="signature"><ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li>
</ul>
</div><p>The <code>error.stack</code> property is a string describing the point in the code at which
the <code>Error</code> was instantiated.</p>
<p>For example:</p>
<pre><code class="lang-txt">Error: Things keep happening!
at /home/gbusey/file.js:525:2
at Frobnicator.refrobulate (/home/gbusey/business-logic.js:424:21)
at Actor.<anonymous> (/home/gbusey/actors.js:400:8)
at increaseSynergy (/home/gbusey/actors.js:701:6)
</code></pre>
<p>The first line is formatted as <code><error class name>: <error message></code>, and
is followed by a series of stack frames (each line beginning with "at ").
Each frame describes a call site within the code that lead to the error being
generated. V8 attempts to display a name for each function (by variable name,
function name, or object method name), but occasionally it will not be able to
find a suitable name. If V8 cannot determine a name for the function, only
location information will be displayed for that frame. Otherwise, the
determined function name will be displayed with location information appended
in parentheses.</p>
<p>Frames are only generated for JavaScript functions. If, for example, execution
synchronously passes through a C++ addon function called <code>cheetahify</code> which
itself calls a JavaScript function, the frame representing the <code>cheetahify</code> call
will not be present in the stack traces:</p>
<pre><code class="lang-js">const cheetahify = require('./native-binding.node');
function makeFaster() {
// cheetahify *synchronously* calls speedy.
cheetahify(function speedy() {
throw new Error('oh no!');
});
}
makeFaster();
// will throw:
// /home/gbusey/file.js:6
// throw new Error('oh no!');
// ^
// Error: oh no!
// at speedy (/home/gbusey/file.js:6:11)
// at makeFaster (/home/gbusey/file.js:5:3)
// at Object.<anonymous> (/home/gbusey/file.js:10:1)
// at Module._compile (module.js:456:26)
// at Object.Module._extensions..js (module.js:474:10)
// at Module.load (module.js:356:32)
// at Function.Module._load (module.js:312:12)
// at Function.Module.runMain (module.js:497:10)
// at startup (node.js:119:16)
// at node.js:906:3
</code></pre>
<p>The location information will be one of:</p>
<ul>
<li><code>native</code>, if the frame represents a call internal to V8 (as in <code>[].forEach</code>).</li>
<li><code>plain-filename.js:line:column</code>, if the frame represents a call internal
to Node.js.</li>
<li><code>/absolute/path/to/file.js:line:column</code>, if the frame represents a call in
a user program, or its dependencies.</li>
</ul>
<p>The string representing the stack trace is lazily generated when the
<code>error.stack</code> property is <strong>accessed</strong>.</p>
<p>The number of frames captured by the stack trace is bounded by the smaller of
<code>Error.stackTraceLimit</code> or the number of available frames on the current event
loop tick.</p>
<p>System-level errors are generated as augmented <code>Error</code> instances, which are
detailed <a href="#errors_system_errors">here</a>.</p>
<h2>Class: AssertionError<span><a class="mark" href="#errors_class_assertionerror" id="errors_class_assertionerror">#</a></span></h2>
<p>A subclass of <code>Error</code> that indicates the failure of an assertion. Such errors
commonly indicate inequality of actual and expected value.</p>
<p>For example:</p>
<pre><code class="lang-js">assert.strictEqual(1, 2);
// AssertionError [ERR_ASSERTION]: 1 === 2
</code></pre>
<h2>Class: RangeError<span><a class="mark" href="#errors_class_rangeerror" id="errors_class_rangeerror">#</a></span></h2>
<p>A subclass of <code>Error</code> that indicates that a provided argument was not within the
set or range of acceptable values for a function; whether that is a numeric
range, or outside the set of options for a given function parameter.</p>
<p>For example:</p>
<pre><code class="lang-js">require('net').connect(-1);
// throws "RangeError: "port" option should be >= 0 and < 65536: -1"
</code></pre>
<p>Node.js will generate and throw <code>RangeError</code> instances <em>immediately</em> as a form
of argument validation.</p>
<h2>Class: ReferenceError<span><a class="mark" href="#errors_class_referenceerror" id="errors_class_referenceerror">#</a></span></h2>
<p>A subclass of <code>Error</code> that indicates that an attempt is being made to access a
variable that is not defined. Such errors commonly indicate typos in code, or
an otherwise broken program.</p>
<p>While client code may generate and propagate these errors, in practice, only V8
will do so.</p>
<pre><code class="lang-js">doesNotExist;
// throws ReferenceError, doesNotExist is not a variable in this program.
</code></pre>
<p>Unless an application is dynamically generating and running code,
<code>ReferenceError</code> instances should always be considered a bug in the code
or its dependencies.</p>
<h2>Class: SyntaxError<span><a class="mark" href="#errors_class_syntaxerror" id="errors_class_syntaxerror">#</a></span></h2>
<p>A subclass of <code>Error</code> that indicates that a program is not valid JavaScript.
These errors may only be generated and propagated as a result of code
evaluation. Code evaluation may happen as a result of <code>eval</code>, <code>Function</code>,
<code>require</code>, or <a href="vm.html">vm</a>. These errors are almost always indicative of a broken
program.</p>
<pre><code class="lang-js">try {
require('vm').runInThisContext('binary ! isNotOk');
} catch (err) {
// err will be a SyntaxError
}
</code></pre>
<p><code>SyntaxError</code> instances are unrecoverable in the context that created them –
they may only be caught by other contexts.</p>
<h2>Class: TypeError<span><a class="mark" href="#errors_class_typeerror" id="errors_class_typeerror">#</a></span></h2>
<p>A subclass of <code>Error</code> that indicates that a provided argument is not an
allowable type. For example, passing a function to a parameter which expects a
string would be considered a TypeError.</p>
<pre><code class="lang-js">require('url').parse(() => { });
// throws TypeError, since it expected a string
</code></pre>
<p>Node.js will generate and throw <code>TypeError</code> instances <em>immediately</em> as a form
of argument validation.</p>
<h2>Exceptions vs. Errors<span><a class="mark" href="#errors_exceptions_vs_errors" id="errors_exceptions_vs_errors">#</a></span></h2>
<!--type=misc-->
<p>A JavaScript exception is a value that is thrown as a result of an invalid
operation or as the target of a <code>throw</code> statement. While it is not required
that these values are instances of <code>Error</code> or classes which inherit from
<code>Error</code>, all exceptions thrown by Node.js or the JavaScript runtime <em>will</em> be
instances of Error.</p>
<p>Some exceptions are <em>unrecoverable</em> at the JavaScript layer. Such exceptions
will <em>always</em> cause the Node.js process to crash. Examples include <code>assert()</code>
checks or <code>abort()</code> calls in the C++ layer.</p>
<h2>System Errors<span><a class="mark" href="#errors_system_errors" id="errors_system_errors">#</a></span></h2>
<p>System errors are generated when exceptions occur within the program's
runtime environment. Typically, these are operational errors that occur
when an application violates an operating system constraint such as attempting
to read a file that does not exist or when the user does not have sufficient
permissions.</p>
<p>System errors are typically generated at the syscall level: an exhaustive list
of error codes and their meanings is available by running <code>man 2 intro</code> or
<code>man 3 errno</code> on most Unices; or <a href="http://man7.org/linux/man-pages/man3/errno.3.html">online</a>.</p>
<p>In Node.js, system errors are represented as augmented <code>Error</code> objects with
added properties.</p>
<h3>Class: System Error<span><a class="mark" href="#errors_class_system_error" id="errors_class_system_error">#</a></span></h3>
<h4>error.code<span><a class="mark" href="#errors_error_code_1" id="errors_error_code_1">#</a></span></h4>
<div class="signature"><ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li>
</ul>
</div><p>The <code>error.code</code> property is a string representing the error code, which is
typically <code>E</code> followed by a sequence of capital letters.</p>
<h4>error.errno<span><a class="mark" href="#errors_error_errno" id="errors_error_errno">#</a></span></h4>
<div class="signature"><ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> | <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a></li>
</ul>
</div><p>The <code>error.errno</code> property is a number or a string.
The number is a <strong>negative</strong> value which corresponds to the error code defined
in <a href="http://docs.libuv.org/en/v1.x/errors.html"><code>libuv Error handling</code></a>. See uv-errno.h header file
(<code>deps/uv/include/uv-errno.h</code> in the Node.js source tree) for details. In case
of a string, it is the same as <code>error.code</code>.</p>
<h4>error.syscall<span><a class="mark" href="#errors_error_syscall" id="errors_error_syscall">#</a></span></h4>
<div class="signature"><ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li>
</ul>
</div><p>The <code>error.syscall</code> property is a string describing the <a href="http://man7.org/linux/man-pages/man2/syscall.2.html">syscall</a> that failed.</p>
<h4>error.path<span><a class="mark" href="#errors_error_path" id="errors_error_path">#</a></span></h4>
<div class="signature"><ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li>
</ul>
</div><p>When present (e.g. in <code>fs</code> or <code>child_process</code>), the <code>error.path</code> property is a
string containing a relevant invalid pathname.</p>
<h4>error.address<span><a class="mark" href="#errors_error_address" id="errors_error_address">#</a></span></h4>
<div class="signature"><ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li>
</ul>
</div><p>When present (e.g. in <code>net</code> or <code>dgram</code>), the <code>error.address</code> property is a
string describing the address to which the connection failed.</p>
<h4>error.port<span><a class="mark" href="#errors_error_port" id="errors_error_port">#</a></span></h4>
<div class="signature"><ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a></li>
</ul>
</div><p>When present (e.g. in <code>net</code> or <code>dgram</code>), the <code>error.port</code> property is a number
representing the connection's port that is not available.</p>
<h3>Common System Errors<span><a class="mark" href="#errors_common_system_errors" id="errors_common_system_errors">#</a></span></h3>
<p>This list is <strong>not exhaustive</strong>, but enumerates many of the common system
errors encountered when writing a Node.js program. An exhaustive list may be
found <a href="http://man7.org/linux/man-pages/man3/errno.3.html">here</a>.</p>
<ul>
<li><p><code>EACCES</code> (Permission denied): An attempt was made to access a file in a way
forbidden by its file access permissions.</p>
</li>
<li><p><code>EADDRINUSE</code> (Address already in use): An attempt to bind a server
(<a href="net.html"><code>net</code></a>, <a href="http.html"><code>http</code></a>, or <a href="https.html"><code>https</code></a>) to a local address failed due to
another server on the local system already occupying that address.</p>
</li>
<li><p><code>ECONNREFUSED</code> (Connection refused): No connection could be made because the
target machine actively refused it. This usually results from trying to
connect to a service that is inactive on the foreign host.</p>
</li>
<li><p><code>ECONNRESET</code> (Connection reset by peer): A connection was forcibly closed by
a peer. This normally results from a loss of the connection on the remote
socket due to a timeout or reboot. Commonly encountered via the <a href="http.html"><code>http</code></a>
and <a href="net.html"><code>net</code></a> modules.</p>
</li>
<li><p><code>EEXIST</code> (File exists): An existing file was the target of an operation that
required that the target not exist.</p>
</li>
<li><p><code>EISDIR</code> (Is a directory): An operation expected a file, but the given
pathname was a directory.</p>
</li>
<li><p><code>EMFILE</code> (Too many open files in system): Maximum number of
<a href="https://en.wikipedia.org/wiki/File_descriptor">file descriptors</a> allowable on the system has been reached, and
requests for another descriptor cannot be fulfilled until at least one
has been closed. This is encountered when opening many files at once in
parallel, especially on systems (in particular, macOS) where there is a low
file descriptor limit for processes. To remedy a low limit, run
<code>ulimit -n 2048</code> in the same shell that will run the Node.js process.</p>
</li>
<li><p><code>ENOENT</code> (No such file or directory): Commonly raised by <a href="fs.html"><code>fs</code></a> operations
to indicate that a component of the specified pathname does not exist — no
entity (file or directory) could be found by the given path.</p>
</li>
<li><p><code>ENOTDIR</code> (Not a directory): A component of the given pathname existed, but
was not a directory as expected. Commonly raised by <a href="fs.html#fs_fs_readdir_path_options_callback"><code>fs.readdir</code></a>.</p>
</li>
<li><p><code>ENOTEMPTY</code> (Directory not empty): A directory with entries was the target
of an operation that requires an empty directory — usually <a href="fs.html#fs_fs_unlink_path_callback"><code>fs.unlink</code></a>.</p>
</li>
<li><p><code>EPERM</code> (Operation not permitted): An attempt was made to perform an
operation that requires elevated privileges.</p>
</li>
<li><p><code>EPIPE</code> (Broken pipe): A write on a pipe, socket, or FIFO for which there is
no process to read the data. Commonly encountered at the <a href="net.html"><code>net</code></a> and
<a href="http.html"><code>http</code></a> layers, indicative that the remote side of the stream being
written to has been closed.</p>
</li>
<li><p><code>ETIMEDOUT</code> (Operation timed out): A connect or send request failed because
the connected party did not properly respond after a period of time. Usually
encountered by <a href="http.html"><code>http</code></a> or <a href="net.html"><code>net</code></a> — often a sign that a <code>socket.end()</code>
was not properly called.</p>
</li>
</ul>
<p><a id="nodejs-error-codes"></a></p>
<h2>Node.js Error Codes<span><a class="mark" href="#errors_node_js_error_codes" id="errors_node_js_error_codes">#</a></span></h2>
<p><a id="ERR_ARG_NOT_ITERABLE"></a></p>
<h3>ERR_ARG_NOT_ITERABLE<span><a class="mark" href="#errors_err_arg_not_iterable" id="errors_err_arg_not_iterable">#</a></span><span><a class="mark" href="#ERR_ARG_NOT_ITERABLE" id="ERR_ARG_NOT_ITERABLE">#</a></span></h3>
<p>An iterable argument (i.e. a value that works with <code>for...of</code> loops) was
required, but not provided to a Node.js API.</p>
<p><a id="ERR_ASYNC_CALLBACK"></a></p>
<h3>ERR_ASYNC_CALLBACK<span><a class="mark" href="#errors_err_async_callback" id="errors_err_async_callback">#</a></span><span><a class="mark" href="#ERR_ASYNC_CALLBACK" id="ERR_ASYNC_CALLBACK">#</a></span></h3>
<p>An attempt was made to register something that is not a function as an
<code>AsyncHooks</code> callback.</p>
<p><a id="ERR_ASYNC_TYPE"></a></p>
<h3>ERR_ASYNC_TYPE<span><a class="mark" href="#errors_err_async_type" id="errors_err_async_type">#</a></span><span><a class="mark" href="#ERR_ASYNC_TYPE" id="ERR_ASYNC_TYPE">#</a></span></h3>
<p>The type of an asynchronous resource was invalid. Note that users are also able
to define their own types if using the public embedder API.</p>
<p><a id="ERR_ENCODING_INVALID_ENCODED_DATA"></a></p>
<h3>ERR_ENCODING_INVALID_ENCODED_DATA<span><a class="mark" href="#errors_err_encoding_invalid_encoded_data" id="errors_err_encoding_invalid_encoded_data">#</a></span><span><a class="mark" href="#ERR_ENCODING_INVALID_ENCODED_DATA" id="ERR_ENCODING_INVALID_ENCODED_DATA">#</a></span></h3>
<p>Data provided to <code>util.TextDecoder()</code> API was invalid according to the encoding
provided.</p>
<p><a id="ERR_ENCODING_NOT_SUPPORTED"></a></p>
<h3>ERR_ENCODING_NOT_SUPPORTED<span><a class="mark" href="#errors_err_encoding_not_supported" id="errors_err_encoding_not_supported">#</a></span><span><a class="mark" href="#ERR_ENCODING_NOT_SUPPORTED" id="ERR_ENCODING_NOT_SUPPORTED">#</a></span></h3>
<p>Encoding provided to <code>util.TextDecoder()</code> API was not one of the
<a href="util.md#whatwg-supported-encodings">WHATWG Supported Encodings</a>.</p>
<p><a id="ERR_FALSY_VALUE_REJECTION"></a></p>
<h3>ERR_FALSY_VALUE_REJECTION<span><a class="mark" href="#errors_err_falsy_value_rejection" id="errors_err_falsy_value_rejection">#</a></span><span><a class="mark" href="#ERR_FALSY_VALUE_REJECTION" id="ERR_FALSY_VALUE_REJECTION">#</a></span></h3>
<p>A <code>Promise</code> that was callbackified via <code>util.callbackify()</code> was rejected with a
falsy value.</p>
<p><a id="ERR_HTTP_HEADERS_SENT"></a></p>
<h3>ERR_HTTP_HEADERS_SENT<span><a class="mark" href="#errors_err_http_headers_sent" id="errors_err_http_headers_sent">#</a></span><span><a class="mark" href="#ERR_HTTP_HEADERS_SENT" id="ERR_HTTP_HEADERS_SENT">#</a></span></h3>
<p>An attempt was made to add more headers after the headers had already been sent.</p>
<p><a id="ERR_HTTP_INVALID_CHAR"></a></p>
<h3>ERR_HTTP_INVALID_CHAR<span><a class="mark" href="#errors_err_http_invalid_char" id="errors_err_http_invalid_char">#</a></span><span><a class="mark" href="#ERR_HTTP_INVALID_CHAR" id="ERR_HTTP_INVALID_CHAR">#</a></span></h3>
<p>An invalid character was found in an HTTP response status message (reason
phrase).</p>
<p><a id="ERR_HTTP_INVALID_STATUS_CODE"></a></p>
<h3>ERR_HTTP_INVALID_STATUS_CODE<span><a class="mark" href="#errors_err_http_invalid_status_code" id="errors_err_http_invalid_status_code">#</a></span><span><a class="mark" href="#ERR_HTTP_INVALID_STATUS_CODE" id="ERR_HTTP_INVALID_STATUS_CODE">#</a></span></h3>
<p>Status code was outside the regular status code range (100-999).</p>
<p><a id="ERR_HTTP_TRAILER_INVALID"></a></p>
<h3>ERR_HTTP_TRAILER_INVALID<span><a class="mark" href="#errors_err_http_trailer_invalid" id="errors_err_http_trailer_invalid">#</a></span><span><a class="mark" href="#ERR_HTTP_TRAILER_INVALID" id="ERR_HTTP_TRAILER_INVALID">#</a></span></h3>
<p>The <code>Trailer</code> header was set even though the transfer encoding does not support
that.</p>
<p><a id="ERR_HTTP2_ALREADY_SHUTDOWN"></a></p>
<h3>ERR_HTTP2_ALREADY_SHUTDOWN<span><a class="mark" href="#errors_err_http2_already_shutdown" id="errors_err_http2_already_shutdown">#</a></span><span><a class="mark" href="#ERR_HTTP2_ALREADY_SHUTDOWN" id="ERR_HTTP2_ALREADY_SHUTDOWN">#</a></span></h3>
<p>Occurs with multiple attempts to shutdown an HTTP/2 session.</p>
<p><a id="ERR_HTTP2_ALTSVC_INVALID_ORIGIN"></a></p>
<h3>ERR_HTTP2_ALTSVC_INVALID_ORIGIN<span><a class="mark" href="#errors_err_http2_altsvc_invalid_origin" id="errors_err_http2_altsvc_invalid_origin">#</a></span><span><a class="mark" href="#ERR_HTTP2_ALTSVC_INVALID_ORIGIN" id="ERR_HTTP2_ALTSVC_INVALID_ORIGIN">#</a></span></h3>
<p>HTTP/2 ALTSVC frames require a valid origin.</p>
<p><a id="ERR_HTTP2_ALTSVC_LENGTH"></a></p>
<h3>ERR_HTTP2_ALTSVC_LENGTH<span><a class="mark" href="#errors_err_http2_altsvc_length" id="errors_err_http2_altsvc_length">#</a></span><span><a class="mark" href="#ERR_HTTP2_ALTSVC_LENGTH" id="ERR_HTTP2_ALTSVC_LENGTH">#</a></span></h3>
<p>HTTP/2 ALTSVC frames are limited to a maximum of 16,382 payload bytes.</p>
<p><a id="ERR_HTTP2_CONNECT_AUTHORITY"></a></p>
<h3>ERR_HTTP2_CONNECT_AUTHORITY<span><a class="mark" href="#errors_err_http2_connect_authority" id="errors_err_http2_connect_authority">#</a></span><span><a class="mark" href="#ERR_HTTP2_CONNECT_AUTHORITY" id="ERR_HTTP2_CONNECT_AUTHORITY">#</a></span></h3>
<p>For HTTP/2 requests using the <code>CONNECT</code> method, the <code>:authority</code> pseudo-header
is required.</p>
<p><a id="ERR_HTTP2_CONNECT_PATH"></a></p>
<h3>ERR_HTTP2_CONNECT_PATH<span><a class="mark" href="#errors_err_http2_connect_path" id="errors_err_http2_connect_path">#</a></span><span><a class="mark" href="#ERR_HTTP2_CONNECT_PATH" id="ERR_HTTP2_CONNECT_PATH">#</a></span></h3>
<p>For HTTP/2 requests using the <code>CONNECT</code> method, the <code>:path</code> pseudo-header is
forbidden.</p>
<p><a id="ERR_HTTP2_CONNECT_SCHEME"></a></p>
<h3>ERR_HTTP2_CONNECT_SCHEME<span><a class="mark" href="#errors_err_http2_connect_scheme" id="errors_err_http2_connect_scheme">#</a></span><span><a class="mark" href="#ERR_HTTP2_CONNECT_SCHEME" id="ERR_HTTP2_CONNECT_SCHEME">#</a></span></h3>
<p>For HTTP/2 requests using the <code>CONNECT</code> method, the <code>:scheme</code> pseudo-header is
forbidden.</p>
<p><a id="ERR_HTTP2_FRAME_ERROR"></a></p>
<h3>ERR_HTTP2_FRAME_ERROR<span><a class="mark" href="#errors_err_http2_frame_error" id="errors_err_http2_frame_error">#</a></span><span><a class="mark" href="#ERR_HTTP2_FRAME_ERROR" id="ERR_HTTP2_FRAME_ERROR">#</a></span></h3>
<p>A failure occurred sending an individual frame on the HTTP/2 session.</p>
<p><a id="ERR_HTTP2_GOAWAY_SESSION"></a></p>
<h3>ERR_HTTP2_GOAWAY_SESSION<span><a class="mark" href="#errors_err_http2_goaway_session" id="errors_err_http2_goaway_session">#</a></span><span><a class="mark" href="#ERR_HTTP2_GOAWAY_SESSION" id="ERR_HTTP2_GOAWAY_SESSION">#</a></span></h3>
<p>New HTTP/2 Streams may not be opened after the <code>Http2Session</code> has received a
<code>GOAWAY</code> frame from the connected peer.</p>
<p><a id="ERR_HTTP2_HEADER_REQUIRED"></a></p>
<h3>ERR_HTTP2_HEADER_REQUIRED<span><a class="mark" href="#errors_err_http2_header_required" id="errors_err_http2_header_required">#</a></span><span><a class="mark" href="#ERR_HTTP2_HEADER_REQUIRED" id="ERR_HTTP2_HEADER_REQUIRED">#</a></span></h3>
<p>A required header was missing in an HTTP/2 message.</p>
<p><a id="ERR_HTTP2_HEADER_SINGLE_VALUE"></a></p>
<h3>ERR_HTTP2_HEADER_SINGLE_VALUE<span><a class="mark" href="#errors_err_http2_header_single_value" id="errors_err_http2_header_single_value">#</a></span><span><a class="mark" href="#ERR_HTTP2_HEADER_SINGLE_VALUE" id="ERR_HTTP2_HEADER_SINGLE_VALUE">#</a></span></h3>
<p>Multiple values were provided for an HTTP/2 header field that was required to
have only a single value.</p>
<p><a id="ERR_HTTP2_HEADERS_AFTER_RESPOND"></a></p>
<h3>ERR_HTTP2_HEADERS_AFTER_RESPOND<span><a class="mark" href="#errors_err_http2_headers_after_respond" id="errors_err_http2_headers_after_respond">#</a></span><span><a class="mark" href="#ERR_HTTP2_HEADERS_AFTER_RESPOND" id="ERR_HTTP2_HEADERS_AFTER_RESPOND">#</a></span></h3>
<p>An additional headers was specified after an HTTP/2 response was initiated.</p>
<p><a id="ERR_HTTP2_HEADERS_OBJECT"></a></p>
<h3>ERR_HTTP2_HEADERS_OBJECT<span><a class="mark" href="#errors_err_http2_headers_object" id="errors_err_http2_headers_object">#</a></span><span><a class="mark" href="#ERR_HTTP2_HEADERS_OBJECT" id="ERR_HTTP2_HEADERS_OBJECT">#</a></span></h3>
<p>An HTTP/2 Headers Object was expected.</p>
<p><a id="ERR_HTTP2_HEADERS_SENT"></a></p>
<h3>ERR_HTTP2_HEADERS_SENT<span><a class="mark" href="#errors_err_http2_headers_sent" id="errors_err_http2_headers_sent">#</a></span><span><a class="mark" href="#ERR_HTTP2_HEADERS_SENT" id="ERR_HTTP2_HEADERS_SENT">#</a></span></h3>
<p>An attempt was made to send multiple response headers.</p>
<p><a id="ERR_HTTP2_INFO_HEADERS_AFTER_RESPOND"></a></p>
<h3>ERR_HTTP2_INFO_HEADERS_AFTER_RESPOND<span><a class="mark" href="#errors_err_http2_info_headers_after_respond" id="errors_err_http2_info_headers_after_respond">#</a></span><span><a class="mark" href="#ERR_HTTP2_INFO_HEADERS_AFTER_RESPOND" id="ERR_HTTP2_INFO_HEADERS_AFTER_RESPOND">#</a></span></h3>
<p>HTTP/2 Informational headers must only be sent <em>prior</em> to calling the
<code>Http2Stream.prototype.respond()</code> method.</p>
<p><a id="ERR_HTTP2_INFO_STATUS_NOT_ALLOWED"></a></p>
<h3>ERR_HTTP2_INFO_STATUS_NOT_ALLOWED<span><a class="mark" href="#errors_err_http2_info_status_not_allowed" id="errors_err_http2_info_status_not_allowed">#</a></span><span><a class="mark" href="#ERR_HTTP2_INFO_STATUS_NOT_ALLOWED" id="ERR_HTTP2_INFO_STATUS_NOT_ALLOWED">#</a></span></h3>
<p>Informational HTTP status codes (<code>1xx</code>) may not be set as the response status
code on HTTP/2 responses.</p>
<p><a id="ERR_HTTP2_INVALID_CONNECTION_HEADERS"></a></p>
<h3>ERR_HTTP2_INVALID_CONNECTION_HEADERS<span><a class="mark" href="#errors_err_http2_invalid_connection_headers" id="errors_err_http2_invalid_connection_headers">#</a></span><span><a class="mark" href="#ERR_HTTP2_INVALID_CONNECTION_HEADERS" id="ERR_HTTP2_INVALID_CONNECTION_HEADERS">#</a></span></h3>
<p>HTTP/1 connection specific headers are forbidden to be used in HTTP/2
requests and responses.</p>
<p><a id="ERR_HTTP2_INVALID_HEADER_VALUE"></a></p>
<h3>ERR_HTTP2_INVALID_HEADER_VALUE<span><a class="mark" href="#errors_err_http2_invalid_header_value" id="errors_err_http2_invalid_header_value">#</a></span><span><a class="mark" href="#ERR_HTTP2_INVALID_HEADER_VALUE" id="ERR_HTTP2_INVALID_HEADER_VALUE">#</a></span></h3>
<p>An invalid HTTP/2 header value was specified.</p>
<p><a id="ERR_HTTP2_INVALID_INFO_STATUS"></a></p>
<h3>ERR_HTTP2_INVALID_INFO_STATUS<span><a class="mark" href="#errors_err_http2_invalid_info_status" id="errors_err_http2_invalid_info_status">#</a></span><span><a class="mark" href="#ERR_HTTP2_INVALID_INFO_STATUS" id="ERR_HTTP2_INVALID_INFO_STATUS">#</a></span></h3>
<p>An invalid HTTP informational status code has been specified. Informational
status codes must be an integer between <code>100</code> and <code>199</code> (inclusive).</p>
<p><a id="ERR_HTTP2_INVALID_ORIGIN"></a></p>
<h3>ERR_HTTP2_INVALID_ORIGIN<span><a class="mark" href="#errors_err_http2_invalid_origin" id="errors_err_http2_invalid_origin">#</a></span><span><a class="mark" href="#ERR_HTTP2_INVALID_ORIGIN" id="ERR_HTTP2_INVALID_ORIGIN">#</a></span></h3>
<p>HTTP/2 <code>ORIGIN</code> frames require a valid origin.</p>
<p><a id="ERR_HTTP2_INVALID_PACKED_SETTINGS_LENGTH"></a></p>
<h3>ERR_HTTP2_INVALID_PACKED_SETTINGS_LENGTH<span><a class="mark" href="#errors_err_http2_invalid_packed_settings_length" id="errors_err_http2_invalid_packed_settings_length">#</a></span><span><a class="mark" href="#ERR_HTTP2_INVALID_PACKED_SETTINGS_LENGTH" id="ERR_HTTP2_INVALID_PACKED_SETTINGS_LENGTH">#</a></span></h3>
<p>Input <code>Buffer</code> and <code>Uint8Array</code> instances passed to the
<code>http2.getUnpackedSettings()</code> API must have a length that is a multiple of
six.</p>
<p><a id="ERR_HTTP2_INVALID_PSEUDOHEADER"></a></p>
<h3>ERR_HTTP2_INVALID_PSEUDOHEADER<span><a class="mark" href="#errors_err_http2_invalid_pseudoheader" id="errors_err_http2_invalid_pseudoheader">#</a></span><span><a class="mark" href="#ERR_HTTP2_INVALID_PSEUDOHEADER" id="ERR_HTTP2_INVALID_PSEUDOHEADER">#</a></span></h3>
<p>Only valid HTTP/2 pseudoheaders (<code>:status</code>, <code>:path</code>, <code>:authority</code>, <code>:scheme</code>,
and <code>:method</code>) may be used.</p>
<p><a id="ERR_HTTP2_INVALID_SESSION"></a></p>
<h3>ERR_HTTP2_INVALID_SESSION<span><a class="mark" href="#errors_err_http2_invalid_session" id="errors_err_http2_invalid_session">#</a></span><span><a class="mark" href="#ERR_HTTP2_INVALID_SESSION" id="ERR_HTTP2_INVALID_SESSION">#</a></span></h3>
<p>An action was performed on an <code>Http2Session</code> object that had already been
destroyed.</p>
<p><a id="ERR_HTTP2_INVALID_SETTING_VALUE"></a></p>
<h3>ERR_HTTP2_INVALID_SETTING_VALUE<span><a class="mark" href="#errors_err_http2_invalid_setting_value" id="errors_err_http2_invalid_setting_value">#</a></span><span><a class="mark" href="#ERR_HTTP2_INVALID_SETTING_VALUE" id="ERR_HTTP2_INVALID_SETTING_VALUE">#</a></span></h3>
<p>An invalid value has been specified for an HTTP/2 setting.</p>
<p><a id="ERR_HTTP2_INVALID_STREAM"></a></p>
<h3>ERR_HTTP2_INVALID_STREAM<span><a class="mark" href="#errors_err_http2_invalid_stream" id="errors_err_http2_invalid_stream">#</a></span><span><a class="mark" href="#ERR_HTTP2_INVALID_STREAM" id="ERR_HTTP2_INVALID_STREAM">#</a></span></h3>
<p>An operation was performed on a stream that had already been destroyed.</p>
<p><a id="ERR_HTTP2_MAX_PENDING_SETTINGS_ACK"></a></p>
<h3>ERR_HTTP2_MAX_PENDING_SETTINGS_ACK<span><a class="mark" href="#errors_err_http2_max_pending_settings_ack" id="errors_err_http2_max_pending_settings_ack">#</a></span><span><a class="mark" href="#ERR_HTTP2_MAX_PENDING_SETTINGS_ACK" id="ERR_HTTP2_MAX_PENDING_SETTINGS_ACK">#</a></span></h3>
<p>Whenever an HTTP/2 <code>SETTINGS</code> frame is sent to a connected peer, the peer is
required to send an acknowledgment that it has received and applied the new
<code>SETTINGS</code>. By default, a maximum number of unacknowledged <code>SETTINGS</code> frames may
be sent at any given time. This error code is used when that limit has been
reached.</p>
<p><a id="ERR_HTTP2_NESTED_PUSH"></a></p>
<h3>ERR_HTTP2_NESTED_PUSH<span><a class="mark" href="#errors_err_http2_nested_push" id="errors_err_http2_nested_push">#</a></span><span><a class="mark" href="#ERR_HTTP2_NESTED_PUSH" id="ERR_HTTP2_NESTED_PUSH">#</a></span></h3>
<p>An attempt was made to initiate a new push stream from within a push stream.
Nested push streams are not permitted.</p>
<p><a id="ERR_HTTP2_NO_SOCKET_MANIPULATION"></a></p>
<h3>ERR_HTTP2_NO_SOCKET_MANIPULATION<span><a class="mark" href="#errors_err_http2_no_socket_manipulation" id="errors_err_http2_no_socket_manipulation">#</a></span><span><a class="mark" href="#ERR_HTTP2_NO_SOCKET_MANIPULATION" id="ERR_HTTP2_NO_SOCKET_MANIPULATION">#</a></span></h3>
<p>An attempt was made to directly manipulate (read, write, pause, resume, etc.) a
socket attached to an <code>Http2Session</code>.</p>
<p><a id="ERR_HTTP2_ORIGIN_LENGTH"></a></p>
<h3>ERR_HTTP2_ORIGIN_LENGTH<span><a class="mark" href="#errors_err_http2_origin_length" id="errors_err_http2_origin_length">#</a></span><span><a class="mark" href="#ERR_HTTP2_ORIGIN_LENGTH" id="ERR_HTTP2_ORIGIN_LENGTH">#</a></span></h3>
<p>HTTP/2 <code>ORIGIN</code> frames are limited to a length of 16382 bytes.</p>
<p><a id="ERR_HTTP2_OUT_OF_STREAMS"></a></p>
<h3>ERR_HTTP2_OUT_OF_STREAMS<span><a class="mark" href="#errors_err_http2_out_of_streams" id="errors_err_http2_out_of_streams">#</a></span><span><a class="mark" href="#ERR_HTTP2_OUT_OF_STREAMS" id="ERR_HTTP2_OUT_OF_STREAMS">#</a></span></h3>
<p>The number of streams created on a single HTTP/2 session reached the maximum
limit.</p>
<p><a id="ERR_HTTP2_PAYLOAD_FORBIDDEN"></a></p>
<h3>ERR_HTTP2_PAYLOAD_FORBIDDEN<span><a class="mark" href="#errors_err_http2_payload_forbidden" id="errors_err_http2_payload_forbidden">#</a></span><span><a class="mark" href="#ERR_HTTP2_PAYLOAD_FORBIDDEN" id="ERR_HTTP2_PAYLOAD_FORBIDDEN">#</a></span></h3>
<p>A message payload was specified for an HTTP response code for which a payload is
forbidden.</p>
<p><a id="ERR_HTTP2_PING_CANCEL"></a></p>
<h3>ERR_HTTP2_PING_CANCEL<span><a class="mark" href="#errors_err_http2_ping_cancel" id="errors_err_http2_ping_cancel">#</a></span><span><a class="mark" href="#ERR_HTTP2_PING_CANCEL" id="ERR_HTTP2_PING_CANCEL">#</a></span></h3>
<p>An HTTP/2 ping was canceled.</p>
<p><a id="ERR_HTTP2_PING_LENGTH"></a></p>
<h3>ERR_HTTP2_PING_LENGTH<span><a class="mark" href="#errors_err_http2_ping_length" id="errors_err_http2_ping_length">#</a></span><span><a class="mark" href="#ERR_HTTP2_PING_LENGTH" id="ERR_HTTP2_PING_LENGTH">#</a></span></h3>
<p>HTTP/2 ping payloads must be exactly 8 bytes in length.</p>
<p><a id="ERR_HTTP2_PSEUDOHEADER_NOT_ALLOWED"></a></p>
<h3>ERR_HTTP2_PSEUDOHEADER_NOT_ALLOWED<span><a class="mark" href="#errors_err_http2_pseudoheader_not_allowed" id="errors_err_http2_pseudoheader_not_allowed">#</a></span><span><a class="mark" href="#ERR_HTTP2_PSEUDOHEADER_NOT_ALLOWED" id="ERR_HTTP2_PSEUDOHEADER_NOT_ALLOWED">#</a></span></h3>
<p>An HTTP/2 pseudo-header has been used inappropriately. Pseudo-headers are header
key names that begin with the <code>:</code> prefix.</p>
<p><a id="ERR_HTTP2_PUSH_DISABLED"></a></p>
<h3>ERR_HTTP2_PUSH_DISABLED<span><a class="mark" href="#errors_err_http2_push_disabled" id="errors_err_http2_push_disabled">#</a></span><span><a class="mark" href="#ERR_HTTP2_PUSH_DISABLED" id="ERR_HTTP2_PUSH_DISABLED">#</a></span></h3>
<p>An attempt was made to create a push stream, which had been disabled by the
client.</p>
<p><a id="ERR_HTTP2_SEND_FILE"></a></p>
<h3>ERR_HTTP2_SEND_FILE<span><a class="mark" href="#errors_err_http2_send_file" id="errors_err_http2_send_file">#</a></span><span><a class="mark" href="#ERR_HTTP2_SEND_FILE" id="ERR_HTTP2_SEND_FILE">#</a></span></h3>
<p>An attempt was made to use the <code>Http2Stream.prototype.responseWithFile()</code> API to
send something other than a regular file.</p>
<p><a id="ERR_HTTP2_SESSION_ERROR"></a></p>
<h3>ERR_HTTP2_SESSION_ERROR<span><a class="mark" href="#errors_err_http2_session_error" id="errors_err_http2_session_error">#</a></span><span><a class="mark" href="#ERR_HTTP2_SESSION_ERROR" id="ERR_HTTP2_SESSION_ERROR">#</a></span></h3>
<p>The <code>Http2Session</code> closed with a non-zero error code.</p>
<p><a id="ERR_HTTP2_SETTINGS_CANCEL"></a></p>
<h3>ERR_HTTP2_SETTINGS_CANCEL<span><a class="mark" href="#errors_err_http2_settings_cancel" id="errors_err_http2_settings_cancel">#</a></span><span><a class="mark" href="#ERR_HTTP2_SETTINGS_CANCEL" id="ERR_HTTP2_SETTINGS_CANCEL">#</a></span></h3>
<p>The <code>Http2Session</code> settings canceled.</p>
<p><a id="ERR_HTTP2_SOCKET_BOUND"></a></p>
<h3>ERR_HTTP2_SOCKET_BOUND<span><a class="mark" href="#errors_err_http2_socket_bound" id="errors_err_http2_socket_bound">#</a></span><span><a class="mark" href="#ERR_HTTP2_SOCKET_BOUND" id="ERR_HTTP2_SOCKET_BOUND">#</a></span></h3>
<p>An attempt was made to connect a <code>Http2Session</code> object to a <code>net.Socket</code> or
<code>tls.TLSSocket</code> that had already been bound to another <code>Http2Session</code> object.</p>
<p><a id="ERR_HTTP2_SOCKET_UNBOUND"></a></p>
<h3>ERR_HTTP2_SOCKET_UNBOUND<span><a class="mark" href="#errors_err_http2_socket_unbound" id="errors_err_http2_socket_unbound">#</a></span><span><a class="mark" href="#ERR_HTTP2_SOCKET_UNBOUND" id="ERR_HTTP2_SOCKET_UNBOUND">#</a></span></h3>
<p>An attempt was made to use the <code>socket</code> property of an <code>Http2Session</code> that
has already been closed.</p>
<p><a id="ERR_HTTP2_STATUS_101"></a></p>
<h3>ERR_HTTP2_STATUS_101<span><a class="mark" href="#errors_err_http2_status_101" id="errors_err_http2_status_101">#</a></span><span><a class="mark" href="#ERR_HTTP2_STATUS_101" id="ERR_HTTP2_STATUS_101">#</a></span></h3>
<p>Use of the <code>101</code> Informational status code is forbidden in HTTP/2.</p>
<p><a id="ERR_HTTP2_STATUS_INVALID"></a></p>
<h3>ERR_HTTP2_STATUS_INVALID<span><a class="mark" href="#errors_err_http2_status_invalid" id="errors_err_http2_status_invalid">#</a></span><span><a class="mark" href="#ERR_HTTP2_STATUS_INVALID" id="ERR_HTTP2_STATUS_INVALID">#</a></span></h3>
<p>An invalid HTTP status code has been specified. Status codes must be an integer
between <code>100</code> and <code>599</code> (inclusive).</p>
<p><a id="ERR_HTTP2_STREAM_CANCEL"></a></p>
<h3>ERR_HTTP2_STREAM_CANCEL<span><a class="mark" href="#errors_err_http2_stream_cancel" id="errors_err_http2_stream_cancel">#</a></span><span><a class="mark" href="#ERR_HTTP2_STREAM_CANCEL" id="ERR_HTTP2_STREAM_CANCEL">#</a></span></h3>
<p>An <code>Http2Stream</code> was destroyed before any data was transmitted to the connected
peer.</p>
<p><a id="ERR_HTTP2_STREAM_ERROR"></a></p>
<h3>ERR_HTTP2_STREAM_ERROR<span><a class="mark" href="#errors_err_http2_stream_error" id="errors_err_http2_stream_error">#</a></span><span><a class="mark" href="#ERR_HTTP2_STREAM_ERROR" id="ERR_HTTP2_STREAM_ERROR">#</a></span></h3>
<p>A non-zero error code was been specified in an <code>RST_STREAM</code> frame.</p>
<p><a id="ERR_HTTP2_STREAM_SELF_DEPENDENCY"></a></p>
<h3>ERR_HTTP2_STREAM_SELF_DEPENDENCY<span><a class="mark" href="#errors_err_http2_stream_self_dependency" id="errors_err_http2_stream_self_dependency">#</a></span><span><a class="mark" href="#ERR_HTTP2_STREAM_SELF_DEPENDENCY" id="ERR_HTTP2_STREAM_SELF_DEPENDENCY">#</a></span></h3>
<p>When setting the priority for an HTTP/2 stream, the stream may be marked as
a dependency for a parent stream. This error code is used when an attempt is
made to mark a stream and dependent of itself.</p>
<p><a id="ERR_HTTP2_TRAILERS_ALREADY_SENT"></a></p>
<h3>ERR_HTTP2_TRAILERS_ALREADY_SENT<span><a class="mark" href="#errors_err_http2_trailers_already_sent" id="errors_err_http2_trailers_already_sent">#</a></span><span><a class="mark" href="#ERR_HTTP2_TRAILERS_ALREADY_SENT" id="ERR_HTTP2_TRAILERS_ALREADY_SENT">#</a></span></h3>
<p>Trailing headers have already been sent on the <code>Http2Stream</code>.</p>
<p><a id="ERR_HTTP2_TRAILERS_NOT_READY"></a></p>
<h3>ERR_HTTP2_TRAILERS_NOT_READY<span><a class="mark" href="#errors_err_http2_trailers_not_ready" id="errors_err_http2_trailers_not_ready">#</a></span><span><a class="mark" href="#ERR_HTTP2_TRAILERS_NOT_READY" id="ERR_HTTP2_TRAILERS_NOT_READY">#</a></span></h3>
<p>The <code>http2stream.sendTrailers()</code> method cannot be called until after the
<code>'wantTrailers'</code> event is emitted on an <code>Http2Stream</code> object. The
<code>'wantTrailers'</code> event will only be emitted if the <code>waitForTrailers</code> option
is set for the <code>Http2Stream</code>.</p>
<p><a id="ERR_HTTP2_UNSUPPORTED_PROTOCOL"></a></p>
<h3>ERR_HTTP2_UNSUPPORTED_PROTOCOL<span><a class="mark" href="#errors_err_http2_unsupported_protocol" id="errors_err_http2_unsupported_protocol">#</a></span><span><a class="mark" href="#ERR_HTTP2_UNSUPPORTED_PROTOCOL" id="ERR_HTTP2_UNSUPPORTED_PROTOCOL">#</a></span></h3>
<p><code>http2.connect()</code> was passed a URL that uses any protocol other than <code>http:</code> or
<code>https:</code>.</p>
<p><a id="ERR_INDEX_OUT_OF_RANGE"></a></p>
<h3>ERR_INDEX_OUT_OF_RANGE<span><a class="mark" href="#errors_err_index_out_of_range" id="errors_err_index_out_of_range">#</a></span><span><a class="mark" href="#ERR_INDEX_OUT_OF_RANGE" id="ERR_INDEX_OUT_OF_RANGE">#</a></span></h3>
<p>A given index was out of the accepted range (e.g. negative offsets).</p>
<p><a id="ERR_INVALID_ARG_TYPE"></a></p>
<h3>ERR_INVALID_ARG_TYPE<span><a class="mark" href="#errors_err_invalid_arg_type" id="errors_err_invalid_arg_type">#</a></span><span><a class="mark" href="#ERR_INVALID_ARG_TYPE" id="ERR_INVALID_ARG_TYPE">#</a></span></h3>
<p>An argument of the wrong type was passed to a Node.js API.</p>
<p><a id="ERR_INVALID_ASYNC_ID"></a></p>
<h3>ERR_INVALID_ASYNC_ID<span><a class="mark" href="#errors_err_invalid_async_id" id="errors_err_invalid_async_id">#</a></span><span><a class="mark" href="#ERR_INVALID_ASYNC_ID" id="ERR_INVALID_ASYNC_ID">#</a></span></h3>
<p>An invalid <code>asyncId</code> or <code>triggerAsyncId</code> was passed using <code>AsyncHooks</code>. An id
less than -1 should never happen.</p>
<p><a id="ERR_INVALID_CALLBACK"></a></p>
<h3>ERR_INVALID_CALLBACK<span><a class="mark" href="#errors_err_invalid_callback" id="errors_err_invalid_callback">#</a></span><span><a class="mark" href="#ERR_INVALID_CALLBACK" id="ERR_INVALID_CALLBACK">#</a></span></h3>
<p>A callback function was required but was not been provided to a Node.js API.</p>
<p><a id="ERR_INVALID_FILE_URL_HOST"></a></p>
<h3>ERR_INVALID_FILE_URL_HOST<span><a class="mark" href="#errors_err_invalid_file_url_host" id="errors_err_invalid_file_url_host">#</a></span><span><a class="mark" href="#ERR_INVALID_FILE_URL_HOST" id="ERR_INVALID_FILE_URL_HOST">#</a></span></h3>
<p>A Node.js API that consumes <code>file:</code> URLs (such as certain functions in the
<a href="fs.html"><code>fs</code></a> module) encountered a file URL with an incompatible host. This
situation can only occur on Unix-like systems where only <code>localhost</code> or an empty
host is supported.</p>
<p><a id="ERR_INVALID_FILE_URL_PATH"></a></p>
<h3>ERR_INVALID_FILE_URL_PATH<span><a class="mark" href="#errors_err_invalid_file_url_path" id="errors_err_invalid_file_url_path">#</a></span><span><a class="mark" href="#ERR_INVALID_FILE_URL_PATH" id="ERR_INVALID_FILE_URL_PATH">#</a></span></h3>
<p>A Node.js API that consumes <code>file:</code> URLs (such as certain functions in the
<a href="fs.html"><code>fs</code></a> module) encountered a file URL with an incompatible path. The exact
semantics for determining whether a path can be used is platform-dependent.</p>
<p><a id="ERR_INVALID_HANDLE_TYPE"></a></p>
<h3>ERR_INVALID_HANDLE_TYPE<span><a class="mark" href="#errors_err_invalid_handle_type" id="errors_err_invalid_handle_type">#</a></span><span><a class="mark" href="#ERR_INVALID_HANDLE_TYPE" id="ERR_INVALID_HANDLE_TYPE">#</a></span></h3>
<p>An attempt was made to send an unsupported "handle" over an IPC communication
channel to a child process. See <a href="child_process.html#child_process_subprocess_send_message_sendhandle_options_callback"><code>subprocess.send()</code></a> and <a href="process.html#process_process_send_message_sendhandle_options_callback"><code>process.send()</code></a> for
more information.</p>
<p><a id="ERR_INVALID_OPT_VALUE"></a></p>
<h3>ERR_INVALID_OPT_VALUE<span><a class="mark" href="#errors_err_invalid_opt_value" id="errors_err_invalid_opt_value">#</a></span><span><a class="mark" href="#ERR_INVALID_OPT_VALUE" id="ERR_INVALID_OPT_VALUE">#</a></span></h3>
<p>An invalid or unexpected value was passed in an options object.</p>
<p><a id="ERR_INVALID_PERFORMANCE_MARK"></a></p>
<h3>ERR_INVALID_PERFORMANCE_MARK<span><a class="mark" href="#errors_err_invalid_performance_mark" id="errors_err_invalid_performance_mark">#</a></span><span><a class="mark" href="#ERR_INVALID_PERFORMANCE_MARK" id="ERR_INVALID_PERFORMANCE_MARK">#</a></span></h3>
<p>While using the Performance Timing API (<code>perf_hooks</code>), a performance mark is
invalid.</p>
<p><a id="ERR_INVALID_PROTOCOL"></a></p>
<h3>ERR_INVALID_PROTOCOL<span><a class="mark" href="#errors_err_invalid_protocol" id="errors_err_invalid_protocol">#</a></span><span><a class="mark" href="#ERR_INVALID_PROTOCOL" id="ERR_INVALID_PROTOCOL">#</a></span></h3>
<p>An invalid <code>options.protocol</code> was passed.</p>
<p><a id="ERR_INVALID_SYNC_FORK_INPUT"></a></p>
<h3>ERR_INVALID_SYNC_FORK_INPUT<span><a class="mark" href="#errors_err_invalid_sync_fork_input" id="errors_err_invalid_sync_fork_input">#</a></span><span><a class="mark" href="#ERR_INVALID_SYNC_FORK_INPUT" id="ERR_INVALID_SYNC_FORK_INPUT">#</a></span></h3>
<p>A <code>Buffer</code>, <code>Uint8Array</code> or <code>string</code> was provided as stdio input to a
synchronous fork. See the documentation for the
<a href="child_process.html"><code>child_process</code></a> module for more information.</p>
<p><a id="ERR_INVALID_THIS"></a></p>
<h3>ERR_INVALID_THIS<span><a class="mark" href="#errors_err_invalid_this" id="errors_err_invalid_this">#</a></span><span><a class="mark" href="#ERR_INVALID_THIS" id="ERR_INVALID_THIS">#</a></span></h3>
<p>A Node.js API function was called with an incompatible <code>this</code> value.</p>
<p>Example:</p>
<pre><code class="lang-js">const { URLSearchParams } = require('url');
const urlSearchParams = new URLSearchParams('foo=bar&baz=new');
const buf = Buffer.alloc(1);
urlSearchParams.has.call(buf, 'foo');
// Throws a TypeError with code 'ERR_INVALID_THIS'
</code></pre>
<p><a id="ERR_INVALID_TUPLE"></a></p>
<h3>ERR_INVALID_TUPLE<span><a class="mark" href="#errors_err_invalid_tuple" id="errors_err_invalid_tuple">#</a></span><span><a class="mark" href="#ERR_INVALID_TUPLE" id="ERR_INVALID_TUPLE">#</a></span></h3>
<p>An element in the <code>iterable</code> provided to the <a href="url.html#url_the_whatwg_url_api">WHATWG</a>
<a href="url.html#url_constructor_new_urlsearchparams_iterable"><code>URLSearchParams</code> constructor</a> did not
represent a <code>[name, value]</code> tuple – that is, if an element is not iterable, or
does not consist of exactly two elements.</p>
<p><a id="ERR_INVALID_URL"></a></p>
<h3>ERR_INVALID_URL<span><a class="mark" href="#errors_err_invalid_url" id="errors_err_invalid_url">#</a></span><span><a class="mark" href="#ERR_INVALID_URL" id="ERR_INVALID_URL">#</a></span></h3>
<p>An invalid URL was passed to the <a href="url.html#url_the_whatwg_url_api">WHATWG</a>
<a href="url.html#url_constructor_new_url_input_base"><code>URL</code> constructor</a> to be parsed. The thrown error object
typically has an additional property <code>'input'</code> that contains the URL that failed
to parse.</p>
<p><a id="ERR_INVALID_URL_SCHEME"></a></p>
<h3>ERR_INVALID_URL_SCHEME<span><a class="mark" href="#errors_err_invalid_url_scheme" id="errors_err_invalid_url_scheme">#</a></span><span><a class="mark" href="#ERR_INVALID_URL_SCHEME" id="ERR_INVALID_URL_SCHEME">#</a></span></h3>
<p>An attempt was made to use a URL of an incompatible scheme (protocol) for a
specific purpose. It is only used in the <a href="url.html#url_the_whatwg_url_api">WHATWG URL API</a> support in the
<a href="fs.html"><code>fs</code></a> module (which only accepts URLs with <code>'file'</code> scheme), but may be used
in other Node.js APIs as well in the future.</p>
<p><a id="ERR_IPC_CHANNEL_CLOSED"></a></p>
<h3>ERR_IPC_CHANNEL_CLOSED<span><a class="mark" href="#errors_err_ipc_channel_closed" id="errors_err_ipc_channel_closed">#</a></span><span><a class="mark" href="#ERR_IPC_CHANNEL_CLOSED" id="ERR_IPC_CHANNEL_CLOSED">#</a></span></h3>
<p>An attempt was made to use an IPC communication channel that was already closed.</p>
<p><a id="ERR_IPC_DISCONNECTED"></a></p>
<h3>ERR_IPC_DISCONNECTED<span><a class="mark" href="#errors_err_ipc_disconnected" id="errors_err_ipc_disconnected">#</a></span><span><a class="mark" href="#ERR_IPC_DISCONNECTED" id="ERR_IPC_DISCONNECTED">#</a></span></h3>
<p>An attempt was made to disconnect an IPC communication channel that was already
disconnected. See the documentation for the
<a href="child_process.html"><code>child_process</code></a> module for more information.</p>
<p><a id="ERR_IPC_ONE_PIPE"></a></p>
<h3>ERR_IPC_ONE_PIPE<span><a class="mark" href="#errors_err_ipc_one_pipe" id="errors_err_ipc_one_pipe">#</a></span><span><a class="mark" href="#ERR_IPC_ONE_PIPE" id="ERR_IPC_ONE_PIPE">#</a></span></h3>
<p>An attempt was made to create a child Node.js process using more than one IPC
communication channel. See the documentation for the
<a href="child_process.html"><code>child_process</code></a> module for more information.</p>
<p><a id="ERR_IPC_SYNC_FORK"></a></p>
<h3>ERR_IPC_SYNC_FORK<span><a class="mark" href="#errors_err_ipc_sync_fork" id="errors_err_ipc_sync_fork">#</a></span><span><a class="mark" href="#ERR_IPC_SYNC_FORK" id="ERR_IPC_SYNC_FORK">#</a></span></h3>
<p>An attempt was made to open an IPC communication channel with a synchronously
forked Node.js process. See the documentation for the
<a href="child_process.html"><code>child_process</code></a> module for more information.</p>
<p><a id="ERR_MISSING_ARGS"></a></p>
<h3>ERR_MISSING_ARGS<span><a class="mark" href="#errors_err_missing_args" id="errors_err_missing_args">#</a></span><span><a class="mark" href="#ERR_MISSING_ARGS" id="ERR_MISSING_ARGS">#</a></span></h3>
<p>A required argument of a Node.js API was not passed. This is only used for
strict compliance with the API specification (which in some cases may accept
<code>func(undefined)</code> but not <code>func()</code>). In most native Node.js APIs,
<code>func(undefined)</code> and <code>func()</code> are treated identically, and the
<a href="#ERR_INVALID_ARG_TYPE"><code>ERR_INVALID_ARG_TYPE</code></a> error code may be used instead.</p>
<p><a id="ERR_MISSING_DYNAMIC_INSTANTIATE_HOOK"></a></p>
<h3>ERR_MISSING_DYNAMIC_INSTANTIATE_HOOK<span><a class="mark" href="#errors_err_missing_dynamic_instantiate_hook" id="errors_err_missing_dynamic_instantiate_hook">#</a></span><span><a class="mark" href="#ERR_MISSING_DYNAMIC_INSTANTIATE_HOOK" id="ERR_MISSING_DYNAMIC_INSTANTIATE_HOOK">#</a></span></h3>
<div class="api_stability api_stability_1"><a href="documentation.html#documentation_stability_index">Stability: 1</a> - Experimental</div><p>Used when an [ES6 module][] loader hook specifies <code>format: 'dynamic</code> but does
not provide a <code>dynamicInstantiate</code> hook.</p>
<p><a id="ERR_MISSING_MODULE"></a></p>
<h3>ERR_MISSING_MODULE<span><a class="mark" href="#errors_err_missing_module" id="errors_err_missing_module">#</a></span><span><a class="mark" href="#ERR_MISSING_MODULE" id="ERR_MISSING_MODULE">#</a></span></h3>
<div class="api_stability api_stability_1"><a href="documentation.html#documentation_stability_index">Stability: 1</a> - Experimental</div><p>Used when an [ES6 module][] cannot be resolved.</p>
<p><a id="ERR_MODULE_RESOLUTION_LEGACY"></a></p>
<h3>ERR_MODULE_RESOLUTION_LEGACY<span><a class="mark" href="#errors_err_module_resolution_legacy" id="errors_err_module_resolution_legacy">#</a></span><span><a class="mark" href="#ERR_MODULE_RESOLUTION_LEGACY" id="ERR_MODULE_RESOLUTION_LEGACY">#</a></span></h3>
<div class="api_stability api_stability_1"><a href="documentation.html#documentation_stability_index">Stability: 1</a> - Experimental</div><p>Used when a failure occurred resolving imports in an [ES6 module][].</p>
<p><a id="ERR_MULTIPLE_CALLBACK"></a></p>
<h3>ERR_MULTIPLE_CALLBACK<span><a class="mark" href="#errors_err_multiple_callback" id="errors_err_multiple_callback">#</a></span><span><a class="mark" href="#ERR_MULTIPLE_CALLBACK" id="ERR_MULTIPLE_CALLBACK">#</a></span></h3>
<p>A callback was called more than once.</p>
<p><em>Note</em>: A callback is almost always meant to only be called once as the query
can either be fulfilled or rejected but not both at the same time. The latter
would be possible by calling a callback more than once.</p>
<p><a id="ERR_NAPI_CONS_FUNCTION"></a></p>
<h3>ERR_NAPI_CONS_FUNCTION<span><a class="mark" href="#errors_err_napi_cons_function" id="errors_err_napi_cons_function">#</a></span><span><a class="mark" href="#ERR_NAPI_CONS_FUNCTION" id="ERR_NAPI_CONS_FUNCTION">#</a></span></h3>
<p>While using <code>N-API</code>, a constructor passed was not a function.</p>
<p><a id="ERR_NAPI_CONS_PROTOTYPE_OBJECT"></a></p>
<h3>ERR_NAPI_CONS_PROTOTYPE_OBJECT<span><a class="mark" href="#errors_err_napi_cons_prototype_object" id="errors_err_napi_cons_prototype_object">#</a></span><span><a class="mark" href="#ERR_NAPI_CONS_PROTOTYPE_OBJECT" id="ERR_NAPI_CONS_PROTOTYPE_OBJECT">#</a></span></h3>
<p>While using <code>N-API</code>, <code>Constructor.prototype</code> was not an object.</p>
<p><a id="ERR_NAPI_INVALID_DATAVIEW_ARGS"></a></p>
<h3>ERR_NAPI_INVALID_DATAVIEW_ARGS<span><a class="mark" href="#errors_err_napi_invalid_dataview_args" id="errors_err_napi_invalid_dataview_args">#</a></span><span><a class="mark" href="#ERR_NAPI_INVALID_DATAVIEW_ARGS" id="ERR_NAPI_INVALID_DATAVIEW_ARGS">#</a></span></h3>
<p>While calling <code>napi_create_dataview()</code>, a given <code>offset</code> was outside the bounds
of the dataview or <code>offset + length</code> was larger than a length of given <code>buffer</code>.</p>
<p><a id="ERR_NAPI_INVALID_TYPEDARRAY_ALIGNMENT"></a></p>
<h3>ERR_NAPI_INVALID_TYPEDARRAY_ALIGNMENT<span><a class="mark" href="#errors_err_napi_invalid_typedarray_alignment" id="errors_err_napi_invalid_typedarray_alignment">#</a></span><span><a class="mark" href="#ERR_NAPI_INVALID_TYPEDARRAY_ALIGNMENT" id="ERR_NAPI_INVALID_TYPEDARRAY_ALIGNMENT">#</a></span></h3>
<p>While calling <code>napi_create_typedarray()</code>, the provided <code>offset</code> was not a
multiple of the element size.</p>
<p><a id="ERR_NAPI_INVALID_TYPEDARRAY_LENGTH"></a></p>
<h3>ERR_NAPI_INVALID_TYPEDARRAY_LENGTH<span><a class="mark" href="#errors_err_napi_invalid_typedarray_length" id="errors_err_napi_invalid_typedarray_length">#</a></span><span><a class="mark" href="#ERR_NAPI_INVALID_TYPEDARRAY_LENGTH" id="ERR_NAPI_INVALID_TYPEDARRAY_LENGTH">#</a></span></h3>
<p>While calling <code>napi_create_typedarray()</code>, <code>(length * size_of_element) +
byte_offset</code> was larger than the length of given <code>buffer</code>.</p>
<p><a id="ERR_NAPI_TSFN_CALL_JS"></a></p>
<h3>ERR_NAPI_TSFN_CALL_JS<span><a class="mark" href="#errors_err_napi_tsfn_call_js" id="errors_err_napi_tsfn_call_js">#</a></span><span><a class="mark" href="#ERR_NAPI_TSFN_CALL_JS" id="ERR_NAPI_TSFN_CALL_JS">#</a></span></h3>
<p>An error occurred while invoking the JavaScript portion of the thread-safe
function.</p>
<p><a id="ERR_NAPI_TSFN_GET_UNDEFINED"></a></p>
<h3>ERR_NAPI_TSFN_GET_UNDEFINED<span><a class="mark" href="#errors_err_napi_tsfn_get_undefined" id="errors_err_napi_tsfn_get_undefined">#</a></span><span><a class="mark" href="#ERR_NAPI_TSFN_GET_UNDEFINED" id="ERR_NAPI_TSFN_GET_UNDEFINED">#</a></span></h3>
<p>An error occurred while attempting to retrieve the JavaScript <code>undefined</code>
value.</p>
<p><a id="ERR_NAPI_TSFN_START_IDLE_LOOP"></a></p>
<h3>ERR_NAPI_TSFN_START_IDLE_LOOP<span><a class="mark" href="#errors_err_napi_tsfn_start_idle_loop" id="errors_err_napi_tsfn_start_idle_loop">#</a></span><span><a class="mark" href="#ERR_NAPI_TSFN_START_IDLE_LOOP" id="ERR_NAPI_TSFN_START_IDLE_LOOP">#</a></span></h3>
<p>On the main thread, values are removed from the queue associated with the
thread-safe function in an idle loop. This error indicates that an error
has occurred when attemping to start the loop.</p>
<p><a id="ERR_NAPI_TSFN_STOP_IDLE_LOOP"></a></p>
<h3>ERR_NAPI_TSFN_STOP_IDLE_LOOP<span><a class="mark" href="#errors_err_napi_tsfn_stop_idle_loop" id="errors_err_napi_tsfn_stop_idle_loop">#</a></span><span><a class="mark" href="#ERR_NAPI_TSFN_STOP_IDLE_LOOP" id="ERR_NAPI_TSFN_STOP_IDLE_LOOP">#</a></span></h3>
<p>Once no more items are left in the queue, the idle loop must be suspended. This
error indicates that the idle loop has failed to stop.</p>
<p><a id="ERR_NO_ICU"></a></p>
<h3>ERR_NO_ICU<span><a class="mark" href="#errors_err_no_icu" id="errors_err_no_icu">#</a></span><span><a class="mark" href="#ERR_NO_ICU" id="ERR_NO_ICU">#</a></span></h3>
<p>An attempt was made to use features that require <a href="intl.html#intl_internationalization_support">ICU</a>, but Node.js was not
compiled with ICU support.</p>
<p><a id="ERR_SOCKET_ALREADY_BOUND"></a></p>
<h3>ERR_SOCKET_ALREADY_BOUND<span><a class="mark" href="#errors_err_socket_already_bound" id="errors_err_socket_already_bound">#</a></span><span><a class="mark" href="#ERR_SOCKET_ALREADY_BOUND" id="ERR_SOCKET_ALREADY_BOUND">#</a></span></h3>
<p>An attempt was made to bind a socket that has already been bound.</p>
<p><a id="ERR_SOCKET_BAD_PORT"></a></p>
<h3>ERR_SOCKET_BAD_PORT<span><a class="mark" href="#errors_err_socket_bad_port" id="errors_err_socket_bad_port">#</a></span><span><a class="mark" href="#ERR_SOCKET_BAD_PORT" id="ERR_SOCKET_BAD_PORT">#</a></span></h3>
<p>An API function expecting a port > 0 and < 65536 received an invalid value.</p>
<p><a id="ERR_SOCKET_BAD_TYPE"></a></p>
<h3>ERR_SOCKET_BAD_TYPE<span><a class="mark" href="#errors_err_socket_bad_type" id="errors_err_socket_bad_type">#</a></span><span><a class="mark" href="#ERR_SOCKET_BAD_TYPE" id="ERR_SOCKET_BAD_TYPE">#</a></span></h3>
<p>An API function expecting a socket type (<code>udp4</code> or <code>udp6</code>) received an invalid
value.</p>
<p><a id="ERR_SOCKET_CANNOT_SEND"></a></p>
<h3>ERR_SOCKET_CANNOT_SEND<span><a class="mark" href="#errors_err_socket_cannot_send" id="errors_err_socket_cannot_send">#</a></span><span><a class="mark" href="#ERR_SOCKET_CANNOT_SEND" id="ERR_SOCKET_CANNOT_SEND">#</a></span></h3>
<p>Data could be sent on a socket.</p>
<p><a id="ERR_SOCKET_CLOSED"></a></p>
<h3>ERR_SOCKET_CLOSED<span><a class="mark" href="#errors_err_socket_closed" id="errors_err_socket_closed">#</a></span><span><a class="mark" href="#ERR_SOCKET_CLOSED" id="ERR_SOCKET_CLOSED">#</a></span></h3>
<p>An attempt was made to operate on an already closed socket.</p>
<p><a id="ERR_SOCKET_DGRAM_NOT_RUNNING"></a></p>
<h3>ERR_SOCKET_DGRAM_NOT_RUNNING<span><a class="mark" href="#errors_err_socket_dgram_not_running" id="errors_err_socket_dgram_not_running">#</a></span><span><a class="mark" href="#ERR_SOCKET_DGRAM_NOT_RUNNING" id="ERR_SOCKET_DGRAM_NOT_RUNNING">#</a></span></h3>
<p>A call was made and the UDP subsystem was not running.</p>
<p><a id="ERR_STDERR_CLOSE"></a></p>
<h3>ERR_STDERR_CLOSE<span><a class="mark" href="#errors_err_stderr_close" id="errors_err_stderr_close">#</a></span><span><a class="mark" href="#ERR_STDERR_CLOSE" id="ERR_STDERR_CLOSE">#</a></span></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tr><th>Version</th><th>Changes</th></tr>
<tr><td>v8.16.0</td>
<td><p>Rather than emitting an error, <code>process.stderr.end()</code> now only closes the stream side but not the underlying resource, making this error obsolete.</p>
</td></tr>
</table>
</details>
</div><p>An attempt was made to close the <code>process.stderr</code> stream. By design, Node.js
does not allow <code>stdout</code> or <code>stderr</code> streams to be closed by user code.</p>
<p><a id="ERR_STDOUT_CLOSE"></a></p>
<h3>ERR_STDOUT_CLOSE<span><a class="mark" href="#errors_err_stdout_close" id="errors_err_stdout_close">#</a></span><span><a class="mark" href="#ERR_STDOUT_CLOSE" id="ERR_STDOUT_CLOSE">#</a></span></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tr><th>Version</th><th>Changes</th></tr>
<tr><td>v8.16.0</td>
<td><p>Rather than emitting an error, <code>process.stderr.end()</code> now only closes the stream side but not the underlying resource, making this error obsolete.</p>
</td></tr>
</table>
</details>
</div><p>An attempt was made to close the <code>process.stdout</code> stream. By design, Node.js
does not allow <code>stdout</code> or <code>stderr</code> streams to be closed by user code.</p>
<p><a id="ERR_TLS_CERT_ALTNAME_INVALID"></a></p>
<h3>ERR_TLS_CERT_ALTNAME_INVALID<span><a class="mark" href="#errors_err_tls_cert_altname_invalid" id="errors_err_tls_cert_altname_invalid">#</a></span><span><a class="mark" href="#ERR_TLS_CERT_ALTNAME_INVALID" id="ERR_TLS_CERT_ALTNAME_INVALID">#</a></span></h3>
<p>While using TLS, the hostname/IP of the peer did not match any of the
subjectAltNames in its certificate.</p>
<p><a id="ERR_TLS_DH_PARAM_SIZE"></a></p>
<h3>ERR_TLS_DH_PARAM_SIZE<span><a class="mark" href="#errors_err_tls_dh_param_size" id="errors_err_tls_dh_param_size">#</a></span><span><a class="mark" href="#ERR_TLS_DH_PARAM_SIZE" id="ERR_TLS_DH_PARAM_SIZE">#</a></span></h3>
<p>While using TLS, the parameter offered for the Diffie-Hellman (<code>DH</code>)
key-agreement protocol is too small. By default, the key length must be greater
than or equal to 1024 bits to avoid vulnerabilities, even though it is strongly
recommended to use 2048 bits or larger for stronger security.</p>
<p><a id="ERR_TLS_HANDSHAKE_TIMEOUT"></a></p>
<h3>ERR_TLS_HANDSHAKE_TIMEOUT<span><a class="mark" href="#errors_err_tls_handshake_timeout" id="errors_err_tls_handshake_timeout">#</a></span><span><a class="mark" href="#ERR_TLS_HANDSHAKE_TIMEOUT" id="ERR_TLS_HANDSHAKE_TIMEOUT">#</a></span></h3>
<p>A TLS/SSL handshake timed out. In this case, the server must also abort the
connection.</p>
<p><a id="ERR_TLS_RENEGOTIATION_FAILED"></a></p>
<h3>ERR_TLS_RENEGOTIATION_FAILED<span><a class="mark" href="#errors_err_tls_renegotiation_failed" id="errors_err_tls_renegotiation_failed">#</a></span><span><a class="mark" href="#ERR_TLS_RENEGOTIATION_FAILED" id="ERR_TLS_RENEGOTIATION_FAILED">#</a></span></h3>
<p>A TLS renegotiation request has failed in a non-specific way.</p>
<p><a id="ERR_TLS_REQUIRED_SERVER_NAME"></a></p>
<h3>ERR_TLS_REQUIRED_SERVER_NAME<span><a class="mark" href="#errors_err_tls_required_server_name" id="errors_err_tls_required_server_name">#</a></span><span><a class="mark" href="#ERR_TLS_REQUIRED_SERVER_NAME" id="ERR_TLS_REQUIRED_SERVER_NAME">#</a></span></h3>
<p>While using TLS, the <code>server.addContext()</code> method was called without providing
a hostname in the first parameter.</p>
<p><a id="ERR_TLS_SESSION_ATTACK"></a></p>
<h3>ERR_TLS_SESSION_ATTACK<span><a class="mark" href="#errors_err_tls_session_attack" id="errors_err_tls_session_attack">#</a></span><span><a class="mark" href="#ERR_TLS_SESSION_ATTACK" id="ERR_TLS_SESSION_ATTACK">#</a></span></h3>
<p>An excessive amount of TLS renegotiations is detected, which is a potential
vector for denial-of-service attacks.</p>
<p><a id="ERR_TRANSFORM_ALREADY_TRANSFORMING"></a></p>
<h3>ERR_TRANSFORM_ALREADY_TRANSFORMING<span><a class="mark" href="#errors_err_transform_already_transforming" id="errors_err_transform_already_transforming">#</a></span><span><a class="mark" href="#ERR_TRANSFORM_ALREADY_TRANSFORMING" id="ERR_TRANSFORM_ALREADY_TRANSFORMING">#</a></span></h3>
<p>A Transform stream finished while it was still transforming.</p>
<p><a id="ERR_TRANSFORM_WITH_LENGTH_0"></a></p>
<h3>ERR_TRANSFORM_WITH_LENGTH_0<span><a class="mark" href="#errors_err_transform_with_length_0" id="errors_err_transform_with_length_0">#</a></span><span><a class="mark" href="#ERR_TRANSFORM_WITH_LENGTH_0" id="ERR_TRANSFORM_WITH_LENGTH_0">#</a></span></h3>
<p>A Transform stream finished with data still in the write buffer.</p>
<p><a id="ERR_UNKNOWN_SIGNAL"></a></p>
<h3>ERR_UNKNOWN_SIGNAL<span><a class="mark" href="#errors_err_unknown_signal" id="errors_err_unknown_signal">#</a></span><span><a class="mark" href="#ERR_UNKNOWN_SIGNAL" id="ERR_UNKNOWN_SIGNAL">#</a></span></h3>
<p>An invalid or unknown process signal was passed to an API expecting a valid
signal (such as <a href="child_process.html#child_process_subprocess_kill_signal"><code>subprocess.kill()</code></a>).</p>
<p><a id="ERR_UNKNOWN_STDIN_TYPE"></a></p>
<h3>ERR_UNKNOWN_STDIN_TYPE<span><a class="mark" href="#errors_err_unknown_stdin_type" id="errors_err_unknown_stdin_type">#</a></span><span><a class="mark" href="#ERR_UNKNOWN_STDIN_TYPE" id="ERR_UNKNOWN_STDIN_TYPE">#</a></span></h3>
<p>An attempt was made to launch a Node.js process with an unknown <code>stdin</code> file
type. This error is usually an indication of a bug within Node.js itself,
although it is possible for user code to trigger it.</p>
<p><a id="ERR_UNKNOWN_STREAM_TYPE"></a></p>
<h3>ERR_UNKNOWN_STREAM_TYPE<span><a class="mark" href="#errors_err_unknown_stream_type" id="errors_err_unknown_stream_type">#</a></span><span><a class="mark" href="#ERR_UNKNOWN_STREAM_TYPE" id="ERR_UNKNOWN_STREAM_TYPE">#</a></span></h3>
<p>An attempt was made to launch a Node.js process with an unknown <code>stdout</code> or
<code>stderr</code> file type. This error is usually an indication of a bug within Node.js
itself, although it is possible for user code to trigger it.</p>
<p><a id="ERR_V8BREAKITERATOR"></a></p>
<h3>ERR_V8BREAKITERATOR<span><a class="mark" href="#errors_err_v8breakiterator" id="errors_err_v8breakiterator">#</a></span><span><a class="mark" href="#ERR_V8BREAKITERATOR" id="ERR_V8BREAKITERATOR">#</a></span></h3>
<p>The V8 BreakIterator API was used but the full ICU data set is not installed.</p>
<p><a id="ERR_VALID_PERFORMANCE_ENTRY_TYPE"></a></p>
<h3>ERR_VALID_PERFORMANCE_ENTRY_TYPE<span><a class="mark" href="#errors_err_valid_performance_entry_type" id="errors_err_valid_performance_entry_type">#</a></span><span><a class="mark" href="#ERR_VALID_PERFORMANCE_ENTRY_TYPE" id="ERR_VALID_PERFORMANCE_ENTRY_TYPE">#</a></span></h3>
<p>While using the Performance Timing API (<code>perf_hooks</code>), no valid performance
entry types were found.</p>
<p><a id="ERR_VALUE_OUT_OF_RANGE"></a></p>
<h3>ERR_VALUE_OUT_OF_RANGE<span><a class="mark" href="#errors_err_value_out_of_range" id="errors_err_value_out_of_range">#</a></span><span><a class="mark" href="#ERR_VALUE_OUT_OF_RANGE" id="ERR_VALUE_OUT_OF_RANGE">#</a></span></h3>
<p>A given value is out of the accepted range.</p>
</div>
</div>
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