Applications running in Node.js will generally experience four categories of errors:
AssertionErrors are a special class of error that can be triggered when Node.js detects an exceptional logic violation that should never occur. These are raised typically by the node:assert module.All JavaScript and system errors raised by Node.js inherit from, or are instances of, the standard JavaScript <Error> class and are guaranteed to provide at least the properties available on that class.
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.
All JavaScript errors are handled as exceptions that immediately generate and throw an error using the standard JavaScript throw mechanism. These are handled using the try…catch construct provided by the JavaScript language.
// Throws with a ReferenceError because z is not defined.
try {
const m = 1;
const n = m + z;
} catch (err) {
// Handle the error here.
} copy Any use of the JavaScript throw mechanism will raise an exception that must be handled or the Node.js process will exit immediately.
With few exceptions, Synchronous APIs (any blocking method that does not return a <Promise> nor accept a callback function, such as fs.readFileSync), will use throw to report errors.
Errors that occur within Asynchronous APIs may be reported in multiple ways:
Some asynchronous methods returns a <Promise>, you should always take into account that it might be rejected. See --unhandled-rejections flag for how the process will react to an unhandled promise rejection.
const fs = require('fs/promises');
(async () => {
let data;
try {
data = await fs.readFile('a file that does not exist');
} catch (err) {
console.error('There was an error reading the file!', err);
return;
}
// Otherwise handle the data
})(); copy Most asynchronous methods that accept a callback function will accept an Error object passed as the first argument to that function. If that first argument is not null and is an instance of Error, then an error occurred that should be handled.
const fs = require('node: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
}); copy When an asynchronous method is called on an object that is an EventEmitter, errors can be routed to that object's 'error' event.
const net = require('node: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); copy A handful of typically asynchronous methods in the Node.js API may still use the throw mechanism to raise exceptions that must be handled using try…catch. There is no comprehensive list of such methods; please refer to the documentation of each method to determine the appropriate error handling mechanism required.
The use of the 'error' event mechanism is most common for stream-based and event emitter-based APIs, which themselves represent a series of asynchronous operations over time (as opposed to a single operation that may pass or fail).
For all EventEmitter objects, if an 'error' event handler is not provided, the error will be thrown, causing the Node.js process to report an uncaught exception and crash unless either: a handler has been registered for the 'uncaughtException' event, or the deprecated node:domain module is used.
const EventEmitter = require('node: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'));
}); copy Errors generated in this way cannot be intercepted using try…catch as they are thrown after the calling code has already exited.
Developers must refer to the documentation for each method to determine exactly how errors raised by those methods are propagated.
Error
A generic JavaScript <Error> object that does not denote any specific circumstance of why the error occurred. Error objects capture a "stack trace" detailing the point in the code at which the Error was instantiated, and may provide a text description of the error.
All errors generated by Node.js, including all system and JavaScript errors, will either be instances of, or inherit from, the Error class.
new Error(message[, options])
Creates a new Error object and sets the error.message property to the provided text message. If an object is passed as message, the text message is generated by calling String(message). If the cause option is provided, it is assigned to the error.cause property. The error.stack property will represent the point in the code at which new Error() was called. Stack traces are dependent on V8's stack trace API. Stack traces extend only to either (a) the beginning of synchronous code execution, or (b) the number of frames given by the property Error.stackTraceLimit, whichever is smaller.
Error.captureStackTrace(targetObject[, constructorOpt])
targetObject <Object>
constructorOpt <Function>
Creates a .stack property on targetObject, which when accessed returns a string representing the location in the code at which Error.captureStackTrace() was called.
const myObject = {};
Error.captureStackTrace(myObject);
myObject.stack; // Similar to `new Error().stack` copy The first line of the trace will be prefixed with ${myObject.name}: ${myObject.message}.
The optional constructorOpt argument accepts a function. If given, all frames above constructorOpt, including constructorOpt, will be omitted from the generated stack trace.
The constructorOpt argument is useful for hiding implementation details of error generation from the user. For instance:
function a() {
b();
}
function b() {
c();
}
function c() {
// Create an error without stack trace to avoid calculating the stack trace twice.
const { stackTraceLimit } = Error;
Error.stackTraceLimit = 0;
const error = new Error();
Error.stackTraceLimit = stackTraceLimit;
// Capture the stack trace above function b
Error.captureStackTrace(error, b); // Neither function c, nor b is included in the stack trace
throw error;
}
a(); copy Error.stackTraceLimit
The Error.stackTraceLimit property specifies the number of stack frames collected by a stack trace (whether generated by new Error().stack or Error.captureStackTrace(obj)).
The default value is 10 but may be set to any valid JavaScript number. Changes will affect any stack trace captured after the value has been changed.
If set to a non-number value, or set to a negative number, stack traces will not capture any frames.
error.cause
If present, the error.cause property is the underlying cause of the Error. It is used when catching an error and throwing a new one with a different message or code in order to still have access to the original error.
The error.cause property is typically set by calling new Error(message, { cause }). It is not set by the constructor if the cause option is not provided.
This property allows errors to be chained. When serializing Error objects, util.inspect() recursively serializes error.cause if it is set.
const cause = new Error('The remote HTTP server responded with a 500 status');
const symptom = new Error('The message failed to send', { cause });
console.log(symptom);
// Prints:
// Error: The message failed to send
// at REPL2:1:17
// at Script.runInThisContext (node:vm:130:12)
// ... 7 lines matching cause stack trace ...
// at [_line] [as _line] (node:internal/readline/interface:886:18) {
// [cause]: Error: The remote HTTP server responded with a 500 status
// at REPL1:1:15
// at Script.runInThisContext (node:vm:130:12)
// at REPLServer.defaultEval (node:repl:574:29)
// at bound (node:domain:426:15)
// at REPLServer.runBound [as eval] (node:domain:437:12)
// at REPLServer.onLine (node:repl:902:10)
// at REPLServer.emit (node:events:549:35)
// at REPLServer.emit (node:domain:482:12)
// at [_onLine] [as _onLine] (node:internal/readline/interface:425:12)
// at [_line] [as _line] (node:internal/readline/interface:886:18) copy error.code
The error.code property is a string label that identifies the kind of error. error.code is the most stable way to identify an error. It will only change between major versions of Node.js. In contrast, error.message strings may change between any versions of Node.js. See Node.js error codes for details about specific codes.
error.message
The error.message property is the string description of the error as set by calling new Error(message). The message passed to the constructor will also appear in the first line of the stack trace of the Error, however changing this property after the Error object is created may not change the first line of the stack trace (for example, when error.stack is read before this property is changed).
const err = new Error('The message');
console.error(err.message);
// Prints: The message copy error.stack
The error.stack property is a string describing the point in the code at which the Error was instantiated.
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) copy
The first line is formatted as <error class name>: <error message>, 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.
Frames are only generated for JavaScript functions. If, for example, execution synchronously passes through a C++ addon function called cheetahify which itself calls a JavaScript function, the frame representing the cheetahify call will not be present in the stack traces:
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 copy The location information will be one of:
native, if the frame represents a call internal to V8 (as in [].forEach).plain-filename.js:line:column, if the frame represents a call internal to Node.js./absolute/path/to/file.js:line:column, if the frame represents a call in a user program (using CommonJS module system), or its dependencies.<transport-protocol>:///url/to/module/file.mjs:line:column, if the frame represents a call in a user program (using ES module system), or its dependencies.The string representing the stack trace is lazily generated when the error.stack property is accessed.
The number of frames captured by the stack trace is bounded by the smaller of Error.stackTraceLimit or the number of available frames on the current event loop tick.
AssertionError
Indicates the failure of an assertion. For details, see Class: assert.AssertionError.
RangeError
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.
require('node:net').connect(-1);
// Throws "RangeError: "port" option should be >= 0 and < 65536: -1" copy Node.js will generate and throw RangeError instances immediately as a form of argument validation.
ReferenceError
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.
While client code may generate and propagate these errors, in practice, only V8 will do so.
doesNotExist; // Throws ReferenceError, doesNotExist is not a variable in this program. copy
Unless an application is dynamically generating and running code, ReferenceError instances indicate a bug in the code or its dependencies.
SyntaxError
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 eval, Function, require, or vm. These errors are almost always indicative of a broken program.
try {
require('node:vm').runInThisContext('binary ! isNotOk');
} catch (err) {
// 'err' will be a SyntaxError.
} copy SyntaxError instances are unrecoverable in the context that created them – they may only be caught by other contexts.
SystemError
Node.js generates system errors when exceptions occur within its runtime environment. These usually occur when an application violates an operating system constraint. For example, a system error will occur if an application attempts to read a file that does not exist.
address <string> If present, the address to which a network connection failedcode <string> The string error codedest <string> If present, the file path destination when reporting a file system errorerrno <number> The system-provided error numberinfo <Object> If present, extra details about the error conditionmessage <string> A system-provided human-readable description of the errorpath <string> If present, the file path when reporting a file system errorport <number> If present, the network connection port that is not availablesyscall <string> The name of the system call that triggered the errorerror.address
If present, error.address is a string describing the address to which a network connection failed.
error.code
The error.code property is a string representing the error code.
error.dest
If present, error.dest is the file path destination when reporting a file system error.
error.errno
The error.errno property is a negative number which corresponds to the error code defined in libuv Error handling.
On Windows the error number provided by the system will be normalized by libuv.
To get the string representation of the error code, use util.getSystemErrorName(error.errno).
error.info
If present, error.info is an object with details about the error condition.
error.message
error.message is a system-provided human-readable description of the error.
error.path
If present, error.path is a string containing a relevant invalid pathname.
error.port
If present, error.port is the network connection port that is not available.
error.syscall
The error.syscall property is a string describing the syscall that failed.
This is a list of system errors commonly-encountered when writing a Node.js program. For a comprehensive list, see the errno(3) man page.
EACCES (Permission denied): An attempt was made to access a file in a way forbidden by its file access permissions.
EADDRINUSE (Address already in use): An attempt to bind a server (net, http, or https) to a local address failed due to another server on the local system already occupying that address.
ECONNREFUSED (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.
ECONNRESET (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 http and net modules.
EEXIST (File exists): An existing file was the target of an operation that required that the target not exist.
EISDIR (Is a directory): An operation expected a file, but the given pathname was a directory.
EMFILE (Too many open files in system): Maximum number of file descriptors 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 ulimit -n 2048 in the same shell that will run the Node.js process.
ENOENT (No such file or directory): Commonly raised by fs 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.
ENOTDIR (Not a directory): A component of the given pathname existed, but was not a directory as expected. Commonly raised by fs.readdir.
ENOTEMPTY (Directory not empty): A directory with entries was the target of an operation that requires an empty directory, usually fs.unlink.
ENOTFOUND (DNS lookup failed): Indicates a DNS failure of either EAI_NODATA or EAI_NONAME. This is not a standard POSIX error.
EPERM (Operation not permitted): An attempt was made to perform an operation that requires elevated privileges.
EPIPE (Broken pipe): A write on a pipe, socket, or FIFO for which there is no process to read the data. Commonly encountered at the net and http layers, indicative that the remote side of the stream being written to has been closed.
ETIMEDOUT (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 http or net. Often a sign that a socket.end() was not properly called.
TypeError
Indicates that a provided argument is not an allowable type. For example, passing a function to a parameter which expects a string would be a TypeError.
require('node:url').parse(() => { });
// Throws TypeError, since it expected a string. copy Node.js will generate and throw TypeError instances immediately as a form of argument validation.
A JavaScript exception is a value that is thrown as a result of an invalid operation or as the target of a throw statement. While it is not required that these values are instances of Error or classes which inherit from Error, all exceptions thrown by Node.js or the JavaScript runtime will be instances of Error.
Some exceptions are unrecoverable at the JavaScript layer. Such exceptions will always cause the Node.js process to crash. Examples include assert() checks or abort() calls in the C++ layer.
Errors originating in crypto or tls are of class Error, and in addition to the standard .code and .message properties, may have some additional OpenSSL-specific properties.
error.opensslErrorStack
An array of errors that can give context to where in the OpenSSL library an error originates from.
error.function
The OpenSSL function the error originates in.
error.library
The OpenSSL library the error originates in.
error.reason
A human-readable string describing the reason for the error.
ABORT_ERR
Used when an operation has been aborted (typically using an AbortController).
APIs not using AbortSignals typically do not raise an error with this code.
This code does not use the regular ERR_* convention Node.js errors use in order to be compatible with the web platform's AbortError.
ERR_ACCESS_DENIED
A special type of error that is triggered whenever Node.js tries to get access to a resource restricted by the Permission Model.
ERR_AMBIGUOUS_ARGUMENT
A function argument is being used in a way that suggests that the function signature may be misunderstood. This is thrown by the node:assert module when the message parameter in assert.throws(block, message) matches the error message thrown by block because that usage suggests that the user believes message is the expected message rather than the message the AssertionError will display if block does not throw.
ERR_ARG_NOT_ITERABLE
An iterable argument (i.e. a value that works with for...of loops) was required, but not provided to a Node.js API.
ERR_ASSERTION
A special type of error that can be triggered whenever Node.js detects an exceptional logic violation that should never occur. These are raised typically by the node:assert module.
ERR_ASYNC_CALLBACK
An attempt was made to register something that is not a function as an AsyncHooks callback.
ERR_ASYNC_TYPE
The type of an asynchronous resource was invalid. Users are also able to define their own types if using the public embedder API.
ERR_BROTLI_COMPRESSION_FAILED
Data passed to a Brotli stream was not successfully compressed.
ERR_BROTLI_INVALID_PARAM
An invalid parameter key was passed during construction of a Brotli stream.
ERR_BUFFER_CONTEXT_NOT_AVAILABLE
An attempt was made to create a Node.js Buffer instance from addon or embedder code, while in a JS engine Context that is not associated with a Node.js instance. The data passed to the Buffer method will have been released by the time the method returns.
When encountering this error, a possible alternative to creating a Buffer instance is to create a normal Uint8Array, which only differs in the prototype of the resulting object. Uint8Arrays are generally accepted in all Node.js core APIs where Buffers are; they are available in all Contexts.
ERR_BUFFER_OUT_OF_BOUNDS
An operation outside the bounds of a Buffer was attempted.
ERR_BUFFER_TOO_LARGE
An attempt has been made to create a Buffer larger than the maximum allowed size.
ERR_CANNOT_WATCH_SIGINT
Node.js was unable to watch for the SIGINT signal.
ERR_CHILD_CLOSED_BEFORE_REPLY
A child process was closed before the parent received a reply.
ERR_CHILD_PROCESS_IPC_REQUIRED
Used when a child process is being forked without specifying an IPC channel.
ERR_CHILD_PROCESS_STDIO_MAXBUFFER
Used when the main process is trying to read data from the child process's STDERR/STDOUT, and the data's length is longer than the maxBuffer option.
ERR_CLOSED_MESSAGE_PORT
There was an attempt to use a MessagePort instance in a closed state, usually after .close() has been called.
ERR_CONSOLE_WRITABLE_STREAM
Console was instantiated without stdout stream, or Console has a non-writable stdout or stderr stream.
ERR_CONSTRUCT_CALL_INVALID
A class constructor was called that is not callable.
ERR_CONSTRUCT_CALL_REQUIRED
A constructor for a class was called without new.
ERR_CONTEXT_NOT_INITIALIZED
The vm context passed into the API is not yet initialized. This could happen when an error occurs (and is caught) during the creation of the context, for example, when the allocation fails or the maximum call stack size is reached when the context is created.
ERR_CRYPTO_CUSTOM_ENGINE_NOT_SUPPORTED
An OpenSSL engine was requested (for example, through the clientCertEngine or privateKeyEngine TLS options) that is not supported by the version of OpenSSL being used, likely due to the compile-time flag OPENSSL_NO_ENGINE.
ERR_CRYPTO_ECDH_INVALID_FORMAT
An invalid value for the format argument was passed to the crypto.ECDH() class getPublicKey() method.
ERR_CRYPTO_ECDH_INVALID_PUBLIC_KEY
An invalid value for the key argument has been passed to the crypto.ECDH() class computeSecret() method. It means that the public key lies outside of the elliptic curve.
ERR_CRYPTO_ENGINE_UNKNOWN
An invalid crypto engine identifier was passed to require('node:crypto').setEngine().
ERR_CRYPTO_FIPS_FORCED
The --force-fips command-line argument was used but there was an attempt to enable or disable FIPS mode in the node:crypto module.
ERR_CRYPTO_FIPS_UNAVAILABLE
An attempt was made to enable or disable FIPS mode, but FIPS mode was not available.
ERR_CRYPTO_HASH_FINALIZED
hash.digest() was called multiple times. The hash.digest() method must be called no more than one time per instance of a Hash object.
ERR_CRYPTO_HASH_UPDATE_FAILED
hash.update() failed for any reason. This should rarely, if ever, happen.
ERR_CRYPTO_INCOMPATIBLE_KEY
The given crypto keys are incompatible with the attempted operation.
ERR_CRYPTO_INCOMPATIBLE_KEY_OPTIONS
The selected public or private key encoding is incompatible with other options.
ERR_CRYPTO_INITIALIZATION_FAILED
Initialization of the crypto subsystem failed.
ERR_CRYPTO_INVALID_AUTH_TAG
An invalid authentication tag was provided.
ERR_CRYPTO_INVALID_COUNTER
An invalid counter was provided for a counter-mode cipher.
ERR_CRYPTO_INVALID_CURVE
An invalid elliptic-curve was provided.
ERR_CRYPTO_INVALID_DIGEST
An invalid crypto digest algorithm was specified.
ERR_CRYPTO_INVALID_IV
An invalid initialization vector was provided.
ERR_CRYPTO_INVALID_JWK
An invalid JSON Web Key was provided.
ERR_CRYPTO_INVALID_KEY_OBJECT_TYPE
The given crypto key object's type is invalid for the attempted operation.
ERR_CRYPTO_INVALID_KEYLEN
An invalid key length was provided.
ERR_CRYPTO_INVALID_KEYPAIR
An invalid key pair was provided.
ERR_CRYPTO_INVALID_KEYTYPE
An invalid key type was provided.
ERR_CRYPTO_INVALID_MESSAGELEN
An invalid message length was provided.
ERR_CRYPTO_INVALID_SCRYPT_PARAMS
Invalid scrypt algorithm parameters were provided.
ERR_CRYPTO_INVALID_STATE
A crypto method was used on an object that was in an invalid state. For instance, calling cipher.getAuthTag() before calling cipher.final().
ERR_CRYPTO_INVALID_TAG_LENGTH
An invalid authentication tag length was provided.
ERR_CRYPTO_JOB_INIT_FAILED
Initialization of an asynchronous crypto operation failed.
ERR_CRYPTO_JWK_UNSUPPORTED_CURVE
Key's Elliptic Curve is not registered for use in the JSON Web Key Elliptic Curve Registry.
ERR_CRYPTO_JWK_UNSUPPORTED_KEY_TYPE
Key's Asymmetric Key Type is not registered for use in the JSON Web Key Types Registry.
ERR_CRYPTO_OPERATION_FAILED
A crypto operation failed for an otherwise unspecified reason.
ERR_CRYPTO_PBKDF2_ERROR
The PBKDF2 algorithm failed for unspecified reasons. OpenSSL does not provide more details and therefore neither does Node.js.
ERR_CRYPTO_SCRYPT_INVALID_PARAMETER
One or more crypto.scrypt() or crypto.scryptSync() parameters are outside their legal range.
ERR_CRYPTO_SCRYPT_NOT_SUPPORTED
Node.js was compiled without scrypt support. Not possible with the official release binaries but can happen with custom builds, including distro builds.
ERR_CRYPTO_SIGN_KEY_REQUIRED
A signing key was not provided to the sign.sign() method.
ERR_CRYPTO_TIMING_SAFE_EQUAL_LENGTH
crypto.timingSafeEqual() was called with Buffer, TypedArray, or DataView arguments of different lengths.
ERR_CRYPTO_UNKNOWN_CIPHER
An unknown cipher was specified.
ERR_CRYPTO_UNKNOWN_DH_GROUP
An unknown Diffie-Hellman group name was given. See crypto.getDiffieHellman() for a list of valid group names.
ERR_CRYPTO_UNSUPPORTED_OPERATION
An attempt to invoke an unsupported crypto operation was made.
ERR_DEBUGGER_ERROR
An error occurred with the debugger.
ERR_DEBUGGER_STARTUP_ERROR
The debugger timed out waiting for the required host/port to be free.
ERR_DLOPEN_DISABLED
Loading native addons has been disabled using --no-addons.
ERR_DLOPEN_FAILED
A call to process.dlopen() failed.
ERR_DIR_CLOSED
The fs.Dir was previously closed.
ERR_DIR_CONCURRENT_OPERATION
A synchronous read or close call was attempted on an fs.Dir which has ongoing asynchronous operations.
ERR_DNS_SET_SERVERS_FAILED
c-ares failed to set the DNS server.
ERR_DOMAIN_CALLBACK_NOT_AVAILABLE
The node:domain module was not usable since it could not establish the required error handling hooks, because process.setUncaughtExceptionCaptureCallback() had been called at an earlier point in time.
ERR_DOMAIN_CANNOT_SET_UNCAUGHT_EXCEPTION_CAPTURE
process.setUncaughtExceptionCaptureCallback() could not be called because the node:domain module has been loaded at an earlier point in time.
The stack trace is extended to include the point in time at which the node:domain module had been loaded.
ERR_DUPLICATE_STARTUP_SNAPSHOT_MAIN_FUNCTION
v8.startupSnapshot.setDeserializeMainFunction() could not be called because it had already been called before.
ERR_ENCODING_INVALID_ENCODED_DATA
Data provided to TextDecoder() API was invalid according to the encoding provided.
ERR_ENCODING_NOT_SUPPORTED
Encoding provided to TextDecoder() API was not one of the WHATWG Supported Encodings.
ERR_EVAL_ESM_CANNOT_PRINT
--print cannot be used with ESM input.
ERR_EVENT_RECURSION
Thrown when an attempt is made to recursively dispatch an event on EventTarget.
ERR_EXECUTION_ENVIRONMENT_NOT_AVAILABLE
The JS execution context is not associated with a Node.js environment. This may occur when Node.js is used as an embedded library and some hooks for the JS engine are not set up properly.
ERR_FALSY_VALUE_REJECTION
A Promise that was callbackified via util.callbackify() was rejected with a falsy value.
ERR_FEATURE_UNAVAILABLE_ON_PLATFORM
Used when a feature that is not available to the current platform which is running Node.js is used.
ERR_FS_CP_DIR_TO_NON_DIR
An attempt was made to copy a directory to a non-directory (file, symlink, etc.) using fs.cp().
ERR_FS_CP_EEXIST
An attempt was made to copy over a file that already existed with fs.cp(), with the force and errorOnExist set to true.
ERR_FS_CP_EINVAL
When using fs.cp(), src or dest pointed to an invalid path.
ERR_HTTP_BODY_NOT_ALLOWED
An error is thrown when writing to an HTTP response which does not allow contents.
ERR_HTTP_CONTENT_LENGTH_MISMATCH
Response body size doesn't match with the specified content-length header value.
ERR_FS_CP_FIFO_PIPE
An attempt was made to copy a named pipe with fs.cp().
ERR_FS_CP_NON_DIR_TO_DIR
An attempt was made to copy a non-directory (file, symlink, etc.) to a directory using fs.cp().
ERR_FS_CP_SOCKET
An attempt was made to copy to a socket with fs.cp().
ERR_FS_CP_SYMLINK_TO_SUBDIRECTORY
When using fs.cp(), a symlink in dest pointed to a subdirectory of src.
ERR_FS_CP_UNKNOWN
An attempt was made to copy to an unknown file type with fs.cp().
ERR_FS_EISDIR
Path is a directory.
ERR_FS_FILE_TOO_LARGE
An attempt has been made to read a file whose size is larger than the maximum allowed size for a Buffer.
ERR_FS_INVALID_SYMLINK_TYPE
An invalid symlink type was passed to the fs.symlink() or fs.symlinkSync() methods.
ERR_HTTP_HEADERS_SENT
An attempt was made to add more headers after the headers had already been sent.
ERR_HTTP_INVALID_HEADER_VALUE
An invalid HTTP header value was specified.
ERR_HTTP_INVALID_STATUS_CODE
Status code was outside the regular status code range (100-999).
ERR_HTTP_REQUEST_TIMEOUT
The client has not sent the entire request within the allowed time.
ERR_HTTP_SOCKET_ASSIGNED
The given ServerResponse was already assigned a socket.
ERR_HTTP_SOCKET_ENCODING
Changing the socket encoding is not allowed per RFC 7230 Section 3.
ERR_HTTP_TRAILER_INVALID
The Trailer header was set even though the transfer encoding does not support that.
ERR_HTTP2_ALTSVC_INVALID_ORIGIN
HTTP/2 ALTSVC frames require a valid origin.
ERR_HTTP2_ALTSVC_LENGTH
HTTP/2 ALTSVC frames are limited to a maximum of 16,382 payload bytes.
ERR_HTTP2_CONNECT_AUTHORITY
For HTTP/2 requests using the CONNECT method, the :authority pseudo-header is required.
ERR_HTTP2_CONNECT_PATH
For HTTP/2 requests using the CONNECT method, the :path pseudo-header is forbidden.
ERR_HTTP2_CONNECT_SCHEME
For HTTP/2 requests using the CONNECT method, the :scheme pseudo-header is forbidden.
ERR_HTTP2_ERROR
A non-specific HTTP/2 error has occurred.
ERR_HTTP2_GOAWAY_SESSION
New HTTP/2 Streams may not be opened after the Http2Session has received a GOAWAY frame from the connected peer.
ERR_HTTP2_HEADER_SINGLE_VALUE
Multiple values were provided for an HTTP/2 header field that was required to have only a single value.
ERR_HTTP2_HEADERS_AFTER_RESPOND
An additional headers was specified after an HTTP/2 response was initiated.
ERR_HTTP2_HEADERS_SENT
An attempt was made to send multiple response headers.
ERR_HTTP2_INFO_STATUS_NOT_ALLOWED
Informational HTTP status codes (1xx) may not be set as the response status code on HTTP/2 responses.
ERR_HTTP2_INVALID_CONNECTION_HEADERS
HTTP/1 connection specific headers are forbidden to be used in HTTP/2 requests and responses.
ERR_HTTP2_INVALID_HEADER_VALUE
An invalid HTTP/2 header value was specified.
ERR_HTTP2_INVALID_INFO_STATUS
An invalid HTTP informational status code has been specified. Informational status codes must be an integer between 100 and 199 (inclusive).
ERR_HTTP2_INVALID_ORIGIN
HTTP/2 ORIGIN frames require a valid origin.
ERR_HTTP2_INVALID_PACKED_SETTINGS_LENGTH
Input Buffer and Uint8Array instances passed to the http2.getUnpackedSettings() API must have a length that is a multiple of six.
ERR_HTTP2_INVALID_PSEUDOHEADER
Only valid HTTP/2 pseudoheaders (:status, :path, :authority, :scheme, and :method) may be used.
ERR_HTTP2_INVALID_SESSION
An action was performed on an Http2Session object that had already been destroyed.
ERR_HTTP2_INVALID_SETTING_VALUE
An invalid value has been specified for an HTTP/2 setting.
ERR_HTTP2_INVALID_STREAM
An operation was performed on a stream that had already been destroyed.
ERR_HTTP2_MAX_PENDING_SETTINGS_ACK
Whenever an HTTP/2 SETTINGS frame is sent to a connected peer, the peer is required to send an acknowledgment that it has received and applied the new SETTINGS. By default, a maximum number of unacknowledged SETTINGS frames may be sent at any given time. This error code is used when that limit has been reached.
ERR_HTTP2_NESTED_PUSH
An attempt was made to initiate a new push stream from within a push stream. Nested push streams are not permitted.
ERR_HTTP2_NO_MEM
Out of memory when using the http2session.setLocalWindowSize(windowSize) API.
ERR_HTTP2_NO_SOCKET_MANIPULATION
An attempt was made to directly manipulate (read, write, pause, resume, etc.) a socket attached to an Http2Session.
ERR_HTTP2_ORIGIN_LENGTH
HTTP/2 ORIGIN frames are limited to a length of 16382 bytes.
ERR_HTTP2_OUT_OF_STREAMS
The number of streams created on a single HTTP/2 session reached the maximum limit.
ERR_HTTP2_PAYLOAD_FORBIDDEN
A message payload was specified for an HTTP response code for which a payload is forbidden.
ERR_HTTP2_PING_CANCEL
An HTTP/2 ping was canceled.
ERR_HTTP2_PING_LENGTH
HTTP/2 ping payloads must be exactly 8 bytes in length.
ERR_HTTP2_PSEUDOHEADER_NOT_ALLOWED
An HTTP/2 pseudo-header has been used inappropriately. Pseudo-headers are header key names that begin with the : prefix.
ERR_HTTP2_PUSH_DISABLED
An attempt was made to create a push stream, which had been disabled by the client.
ERR_HTTP2_SEND_FILE
An attempt was made to use the Http2Stream.prototype.responseWithFile() API to send a directory.
ERR_HTTP2_SEND_FILE_NOSEEK
An attempt was made to use the Http2Stream.prototype.responseWithFile() API to send something other than a regular file, but offset or length options were provided.
ERR_HTTP2_SESSION_ERROR
The Http2Session closed with a non-zero error code.
ERR_HTTP2_SETTINGS_CANCEL
The Http2Session settings canceled.
ERR_HTTP2_SOCKET_BOUND
An attempt was made to connect a Http2Session object to a net.Socket or tls.TLSSocket that had already been bound to another Http2Session object.
ERR_HTTP2_SOCKET_UNBOUND
An attempt was made to use the socket property of an Http2Session that has already been closed.
ERR_HTTP2_STATUS_101
Use of the 101 Informational status code is forbidden in HTTP/2.
ERR_HTTP2_STATUS_INVALID
An invalid HTTP status code has been specified. Status codes must be an integer between 100 and 599 (inclusive).
ERR_HTTP2_STREAM_CANCEL
An Http2Stream was destroyed before any data was transmitted to the connected peer.
ERR_HTTP2_STREAM_ERROR
A non-zero error code was been specified in an RST_STREAM frame.
ERR_HTTP2_STREAM_SELF_DEPENDENCY
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.
ERR_HTTP2_TOO_MANY_INVALID_FRAMES
The limit of acceptable invalid HTTP/2 protocol frames sent by the peer, as specified through the maxSessionInvalidFrames option, has been exceeded.
ERR_HTTP2_TRAILERS_ALREADY_SENT
Trailing headers have already been sent on the Http2Stream.
ERR_HTTP2_TRAILERS_NOT_READY
The http2stream.sendTrailers() method cannot be called until after the 'wantTrailers' event is emitted on an Http2Stream object. The 'wantTrailers' event will only be emitted if the waitForTrailers option is set for the Http2Stream.
ERR_HTTP2_UNSUPPORTED_PROTOCOL
http2.connect() was passed a URL that uses any protocol other than http: or https:.
ERR_ILLEGAL_CONSTRUCTOR
An attempt was made to construct an object using a non-public constructor.
ERR_IMPORT_ASSERTION_TYPE_FAILED
An import assertion has failed, preventing the specified module to be imported.
ERR_IMPORT_ASSERTION_TYPE_MISSING
An import assertion is missing, preventing the specified module to be imported.
ERR_IMPORT_ASSERTION_TYPE_UNSUPPORTED
An import assertion is not supported by this version of Node.js.
ERR_INCOMPATIBLE_OPTION_PAIR
An option pair is incompatible with each other and cannot be used at the same time.
ERR_INPUT_TYPE_NOT_ALLOWED
The --input-type flag was used to attempt to execute a file. This flag can only be used with input via --eval, --print, or STDIN.
ERR_INSPECTOR_ALREADY_ACTIVATED
While using the node:inspector module, an attempt was made to activate the inspector when it already started to listen on a port. Use inspector.close() before activating it on a different address.
ERR_INSPECTOR_ALREADY_CONNECTED
While using the node:inspector module, an attempt was made to connect when the inspector was already connected.
ERR_INSPECTOR_CLOSED
While using the node:inspector module, an attempt was made to use the inspector after the session had already closed.
ERR_INSPECTOR_COMMAND
An error occurred while issuing a command via the node:inspector module.
ERR_INSPECTOR_NOT_ACTIVE
The inspector is not active when inspector.waitForDebugger() is called.
ERR_INSPECTOR_NOT_AVAILABLE
The node:inspector module is not available for use.
ERR_INSPECTOR_NOT_CONNECTED
While using the node:inspector module, an attempt was made to use the inspector before it was connected.
ERR_INSPECTOR_NOT_WORKER
An API was called on the main thread that can only be used from the worker thread.
ERR_INTERNAL_ASSERTION
There was a bug in Node.js or incorrect usage of Node.js internals. To fix the error, open an issue at https://github.com/nodejs/node/issues.
ERR_INVALID_ADDRESS_FAMILY
The provided address family is not understood by the Node.js API.
ERR_INVALID_ARG_TYPE
An argument of the wrong type was passed to a Node.js API.
ERR_INVALID_ARG_VALUE
An invalid or unsupported value was passed for a given argument.
ERR_INVALID_ASYNC_ID
An invalid asyncId or triggerAsyncId was passed using AsyncHooks. An id less than -1 should never happen.
ERR_INVALID_BUFFER_SIZE
A swap was performed on a Buffer but its size was not compatible with the operation.
ERR_INVALID_CHAR
Invalid characters were detected in headers.
ERR_INVALID_CURSOR_POS
A cursor on a given stream cannot be moved to a specified row without a specified column.
ERR_INVALID_FD
A file descriptor ('fd') was not valid (e.g. it was a negative value).
ERR_INVALID_FD_TYPE
A file descriptor ('fd') type was not valid.
ERR_INVALID_FILE_URL_HOST
A Node.js API that consumes file: URLs (such as certain functions in the fs module) encountered a file URL with an incompatible host. This situation can only occur on Unix-like systems where only localhost or an empty host is supported.
ERR_INVALID_FILE_URL_PATH
A Node.js API that consumes file: URLs (such as certain functions in the fs module) encountered a file URL with an incompatible path. The exact semantics for determining whether a path can be used is platform-dependent.
ERR_INVALID_HANDLE_TYPE
An attempt was made to send an unsupported "handle" over an IPC communication channel to a child process. See subprocess.send() and process.send() for more information.
ERR_INVALID_HTTP_TOKEN
An invalid HTTP token was supplied.
ERR_INVALID_IP_ADDRESS
An IP address is not valid.
ERR_INVALID_MIME_SYNTAX
The syntax of a MIME is not valid.
ERR_INVALID_MODULE
An attempt was made to load a module that does not exist or was otherwise not valid.
ERR_INVALID_MODULE_SPECIFIER
The imported module string is an invalid URL, package name, or package subpath specifier.
ERR_INVALID_OBJECT_DEFINE_PROPERTY
An error occurred while setting an invalid attribute on the property of an object.
ERR_INVALID_PACKAGE_CONFIG
An invalid package.json file failed parsing.
ERR_INVALID_PACKAGE_TARGET
The package.json "exports" field contains an invalid target mapping value for the attempted module resolution.
ERR_INVALID_PERFORMANCE_MARK
While using the Performance Timing API (perf_hooks), a performance mark is invalid.
ERR_INVALID_PROTOCOL
An invalid options.protocol was passed to http.request().
ERR_INVALID_REPL_EVAL_CONFIG
Both breakEvalOnSigint and eval options were set in the REPL config, which is not supported.
ERR_INVALID_REPL_INPUT
The input may not be used in the REPL. The conditions under which this error is used are described in the REPL documentation.
ERR_INVALID_RETURN_PROPERTY
Thrown in case a function option does not provide a valid value for one of its returned object properties on execution.
ERR_INVALID_RETURN_PROPERTY_VALUE
Thrown in case a function option does not provide an expected value type for one of its returned object properties on execution.
ERR_INVALID_RETURN_VALUE
Thrown in case a function option does not return an expected value type on execution, such as when a function is expected to return a promise.
ERR_INVALID_STATE
Indicates that an operation cannot be completed due to an invalid state. For instance, an object may have already been destroyed, or may be performing another operation.
ERR_INVALID_SYNC_FORK_INPUT
A Buffer, TypedArray, DataView, or string was provided as stdio input to an asynchronous fork. See the documentation for the child_process module for more information.
ERR_INVALID_THIS
A Node.js API function was called with an incompatible this value.
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' copy ERR_INVALID_TRANSFER_OBJECT
An invalid transfer object was passed to postMessage().
ERR_INVALID_TUPLE
An element in the iterable provided to the WHATWG URLSearchParams constructor did not represent a [name, value] tuple – that is, if an element is not iterable, or does not consist of exactly two elements.
ERR_INVALID_URI
An invalid URI was passed.
ERR_INVALID_URL
An invalid URL was passed to the WHATWG URL constructor or the legacy url.parse() to be parsed. The thrown error object typically has an additional property 'input' that contains the URL that failed to parse.
ERR_INVALID_URL_SCHEME
An attempt was made to use a URL of an incompatible scheme (protocol) for a specific purpose. It is only used in the WHATWG URL API support in the fs module (which only accepts URLs with 'file' scheme), but may be used in other Node.js APIs as well in the future.
ERR_IPC_CHANNEL_CLOSED
An attempt was made to use an IPC communication channel that was already closed.
ERR_IPC_DISCONNECTED
An attempt was made to disconnect an IPC communication channel that was already disconnected. See the documentation for the child_process module for more information.
ERR_IPC_ONE_PIPE
An attempt was made to create a child Node.js process using more than one IPC communication channel. See the documentation for the child_process module for more information.
ERR_IPC_SYNC_FORK
An attempt was made to open an IPC communication channel with a synchronously forked Node.js process. See the documentation for the child_process module for more information.
ERR_LOADER_CHAIN_INCOMPLETE
An ESM loader hook returned without calling next() and without explicitly signaling a short circuit.
ERR_MANIFEST_ASSERT_INTEGRITY
An attempt was made to load a resource, but the resource did not match the integrity defined by the policy manifest. See the documentation for policy manifests for more information.
ERR_MANIFEST_DEPENDENCY_MISSING
An attempt was made to load a resource, but the resource was not listed as a dependency from the location that attempted to load it. See the documentation for policy manifests for more information.
ERR_MANIFEST_INTEGRITY_MISMATCH
An attempt was made to load a policy manifest, but the manifest had multiple entries for a resource which did not match each other. Update the manifest entries to match in order to resolve this error. See the documentation for policy manifests for more information.
ERR_MANIFEST_INVALID_RESOURCE_FIELD
A policy manifest resource had an invalid value for one of its fields. Update the manifest entry to match in order to resolve this error. See the documentation for policy manifests for more information.
ERR_MANIFEST_INVALID_SPECIFIER
A policy manifest resource had an invalid value for one of its dependency mappings. Update the manifest entry to match to resolve this error. See the documentation for policy manifests for more information.
ERR_MANIFEST_PARSE_POLICY
An attempt was made to load a policy manifest, but the manifest was unable to be parsed. See the documentation for policy manifests for more information.
ERR_MANIFEST_TDZ
An attempt was made to read from a policy manifest, but the manifest initialization has not yet taken place. This is likely a bug in Node.js.
ERR_MANIFEST_UNKNOWN_ONERROR
A policy manifest was loaded, but had an unknown value for its "onerror" behavior. See the documentation for policy manifests for more information.
ERR_MEMORY_ALLOCATION_FAILED
An attempt was made to allocate memory (usually in the C++ layer) but it failed.
ERR_MESSAGE_TARGET_CONTEXT_UNAVAILABLE
A message posted to a MessagePort could not be deserialized in the target vm Context. Not all Node.js objects can be successfully instantiated in any context at this time, and attempting to transfer them using postMessage() can fail on the receiving side in that case.
ERR_METHOD_NOT_IMPLEMENTED
A method is required but not implemented.
ERR_MISSING_ARGS
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 func(undefined) but not func()). In most native Node.js APIs, func(undefined) and func() are treated identically, and the ERR_INVALID_ARG_TYPE error code may be used instead.
ERR_MISSING_OPTION
For APIs that accept options objects, some options might be mandatory. This code is thrown if a required option is missing.
ERR_MISSING_PASSPHRASE
An attempt was made to read an encrypted key without specifying a passphrase.
ERR_MISSING_PLATFORM_FOR_WORKER
The V8 platform used by this instance of Node.js does not support creating Workers. This is caused by lack of embedder support for Workers. In particular, this error will not occur with standard builds of Node.js.
ERR_MISSING_TRANSFERABLE_IN_TRANSFER_LIST
An object that needs to be explicitly listed in the transferList argument is in the object passed to a postMessage() call, but is not provided in the transferList for that call. Usually, this is a MessagePort.
In Node.js versions prior to v15.0.0, the error code being used here was ERR_MISSING_MESSAGE_PORT_IN_TRANSFER_LIST. However, the set of transferable object types has been expanded to cover more types than MessagePort.
ERR_MODULE_NOT_FOUND
A module file could not be resolved by the ECMAScript modules loader while attempting an import operation or when loading the program entry point.
ERR_MULTIPLE_CALLBACK
A callback was called more than once.
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.
ERR_NAPI_CONS_FUNCTION
While using Node-API, a constructor passed was not a function.
ERR_NAPI_INVALID_DATAVIEW_ARGS
While calling napi_create_dataview(), a given offset was outside the bounds of the dataview or offset + length was larger than a length of given buffer.
ERR_NAPI_INVALID_TYPEDARRAY_ALIGNMENT
While calling napi_create_typedarray(), the provided offset was not a multiple of the element size.
ERR_NAPI_INVALID_TYPEDARRAY_LENGTH
While calling napi_create_typedarray(), (length * size_of_element) + byte_offset was larger than the length of given buffer.
ERR_NAPI_TSFN_CALL_JS
An error occurred while invoking the JavaScript portion of the thread-safe function.
ERR_NAPI_TSFN_GET_UNDEFINED
An error occurred while attempting to retrieve the JavaScript undefined value.
ERR_NAPI_TSFN_START_IDLE_LOOP
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 attempting to start the loop.
ERR_NAPI_TSFN_STOP_IDLE_LOOP
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.
ERR_NOT_BUILDING_SNAPSHOT
An attempt was made to use operations that can only be used when building V8 startup snapshot even though Node.js isn't building one.
ERR_NOT_SUPPORTED_IN_SNAPSHOT
An attempt was made to perform operations that are not supported when building a startup snapshot.
ERR_NO_CRYPTO
An attempt was made to use crypto features while Node.js was not compiled with OpenSSL crypto support.
ERR_NO_ICU
An attempt was made to use features that require ICU, but Node.js was not compiled with ICU support.
ERR_NON_CONTEXT_AWARE_DISABLED
A non-context-aware native addon was loaded in a process that disallows them.
ERR_OUT_OF_RANGE
A given value is out of the accepted range.
ERR_PACKAGE_IMPORT_NOT_DEFINED
The package.json "imports" field does not define the given internal package specifier mapping.
ERR_PACKAGE_PATH_NOT_EXPORTED
The package.json "exports" field does not export the requested subpath. Because exports are encapsulated, private internal modules that are not exported cannot be imported through the package resolution, unless using an absolute URL.
ERR_PARSE_ARGS_INVALID_OPTION_VALUE
When strict set to true, thrown by util.parseArgs() if a <boolean> value is provided for an option of type <string>, or if a <string> value is provided for an option of type <boolean>.
ERR_PARSE_ARGS_UNEXPECTED_POSITIONAL
Thrown by util.parseArgs(), when a positional argument is provided and allowPositionals is set to false.
ERR_PARSE_ARGS_UNKNOWN_OPTION
When strict set to true, thrown by util.parseArgs() if an argument is not configured in options.
ERR_PERFORMANCE_INVALID_TIMESTAMP
An invalid timestamp value was provided for a performance mark or measure.
ERR_PERFORMANCE_MEASURE_INVALID_OPTIONS
Invalid options were provided for a performance measure.
ERR_PROTO_ACCESS
Accessing Object.prototype.__proto__ has been forbidden using --disable-proto=throw. Object.getPrototypeOf and Object.setPrototypeOf should be used to get and set the prototype of an object.
ERR_REQUIRE_ESM
An attempt was made to require() an ES Module.
ERR_SCRIPT_EXECUTION_INTERRUPTED
Script execution was interrupted by SIGINT (For example, Ctrl+C was pressed.)
ERR_SCRIPT_EXECUTION_TIMEOUT
Script execution timed out, possibly due to bugs in the script being executed.
ERR_SERVER_ALREADY_LISTEN
The server.listen() method was called while a net.Server was already listening. This applies to all instances of net.Server, including HTTP, HTTPS, and HTTP/2 Server instances.
ERR_SERVER_NOT_RUNNING
The server.close() method was called when a net.Server was not running. This applies to all instances of net.Server, including HTTP, HTTPS, and HTTP/2 Server instances.
ERR_SOCKET_ALREADY_BOUND
An attempt was made to bind a socket that has already been bound.
ERR_SOCKET_BAD_BUFFER_SIZE
An invalid (negative) size was passed for either the recvBufferSize or sendBufferSize options in dgram.createSocket().
ERR_SOCKET_BAD_PORT
An API function expecting a port >= 0 and < 65536 received an invalid value.
ERR_SOCKET_BAD_TYPE
An API function expecting a socket type (udp4 or udp6) received an invalid value.
ERR_SOCKET_BUFFER_SIZE
While using dgram.createSocket(), the size of the receive or send Buffer could not be determined.
ERR_SOCKET_CLOSED
An attempt was made to operate on an already closed socket.
ERR_SOCKET_CLOSED_BEFORE_CONNECTION
When calling net.Socket.write() on a connecting socket and the socket was closed before the connection was established.
ERR_SOCKET_CONNECTION_TIMEOUT
The socket was unable to connect to any address returned by the DNS within the allowed timeout when using the family autoselection algorithm.
ERR_SOCKET_DGRAM_IS_CONNECTED
A dgram.connect() call was made on an already connected socket.
ERR_SOCKET_DGRAM_NOT_CONNECTED
A dgram.disconnect() or dgram.remoteAddress() call was made on a disconnected socket.
ERR_SOCKET_DGRAM_NOT_RUNNING
A call was made and the UDP subsystem was not running.
ERR_SRI_PARSE
A string was provided for a Subresource Integrity check, but was unable to be parsed. Check the format of integrity attributes by looking at the Subresource Integrity specification.
ERR_STREAM_ALREADY_FINISHED
A stream method was called that cannot complete because the stream was finished.
ERR_STREAM_CANNOT_PIPE
An attempt was made to call stream.pipe() on a Writable stream.
ERR_STREAM_DESTROYED
A stream method was called that cannot complete because the stream was destroyed using stream.destroy().
ERR_STREAM_NULL_VALUES
An attempt was made to call stream.write() with a null chunk.
ERR_STREAM_PREMATURE_CLOSE
An error returned by stream.finished() and stream.pipeline(), when a stream or a pipeline ends non gracefully with no explicit error.
ERR_STREAM_PUSH_AFTER_EOF
An attempt was made to call stream.push() after a null(EOF) had been pushed to the stream.
ERR_STREAM_UNSHIFT_AFTER_END_EVENT
An attempt was made to call stream.unshift() after the 'end' event was emitted.
ERR_STREAM_WRAP
Prevents an abort if a string decoder was set on the Socket or if the decoder is in objectMode.
const Socket = require('node:net').Socket;
const instance = new Socket();
instance.setEncoding('utf8'); copy ERR_STREAM_WRITE_AFTER_END
An attempt was made to call stream.write() after stream.end() has been called.
ERR_STRING_TOO_LONG
An attempt has been made to create a string longer than the maximum allowed length.
ERR_SYNTHETIC
An artificial error object used to capture the call stack for diagnostic reports.
ERR_SYSTEM_ERROR
An unspecified or non-specific system error has occurred within the Node.js process. The error object will have an err.info object property with additional details.
ERR_TAP_LEXER_ERROR
An error representing a failing lexer state.
ERR_TAP_PARSER_ERROR
An error representing a failing parser state. Additional information about the token causing the error is available via the cause property.
ERR_TAP_VALIDATION_ERROR
This error represents a failed TAP validation.
ERR_TEST_FAILURE
This error represents a failed test. Additional information about the failure is available via the cause property. The failureType property specifies what the test was doing when the failure occurred.
ERR_TLS_ALPN_CALLBACK_INVALID_RESULT
This error is thrown when an ALPNCallback returns a value that is not in the list of ALPN protocols offered by the client.
ERR_TLS_ALPN_CALLBACK_WITH_PROTOCOLS
This error is thrown when creating a TLSServer if the TLS options include both ALPNProtocols and ALPNCallback. These options are mutually exclusive.
ERR_TLS_CERT_ALTNAME_FORMAT
This error is thrown by checkServerIdentity if a user-supplied subjectaltname property violates encoding rules. Certificate objects produced by Node.js itself always comply with encoding rules and will never cause this error.
ERR_TLS_CERT_ALTNAME_INVALID
While using TLS, the host name/IP of the peer did not match any of the subjectAltNames in its certificate.
ERR_TLS_DH_PARAM_SIZE
While using TLS, the parameter offered for the Diffie-Hellman (DH) 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.
ERR_TLS_HANDSHAKE_TIMEOUT
A TLS/SSL handshake timed out. In this case, the server must also abort the connection.
ERR_TLS_INVALID_CONTEXT
The context must be a SecureContext.
ERR_TLS_INVALID_PROTOCOL_METHOD
The specified secureProtocol method is invalid. It is either unknown, or disabled because it is insecure.
ERR_TLS_INVALID_PROTOCOL_VERSION
Valid TLS protocol versions are 'TLSv1', 'TLSv1.1', or 'TLSv1.2'.
ERR_TLS_INVALID_STATE
The TLS socket must be connected and securely established. Ensure the 'secure' event is emitted before continuing.
ERR_TLS_PROTOCOL_VERSION_CONFLICT
Attempting to set a TLS protocol minVersion or maxVersion conflicts with an attempt to set the secureProtocol explicitly. Use one mechanism or the other.
ERR_TLS_PSK_SET_IDENTIY_HINT_FAILED
Failed to set PSK identity hint. Hint may be too long.
ERR_TLS_RENEGOTIATION_DISABLED
An attempt was made to renegotiate TLS on a socket instance with renegotiation disabled.
ERR_TLS_REQUIRED_SERVER_NAME
While using TLS, the server.addContext() method was called without providing a host name in the first parameter.
ERR_TLS_SESSION_ATTACK
An excessive amount of TLS renegotiations is detected, which is a potential vector for denial-of-service attacks.
ERR_TLS_SNI_FROM_SERVER
An attempt was made to issue Server Name Indication from a TLS server-side socket, which is only valid from a client.
ERR_TRACE_EVENTS_CATEGORY_REQUIRED
The trace_events.createTracing() method requires at least one trace event category.
ERR_TRACE_EVENTS_UNAVAILABLE
The node:trace_events module could not be loaded because Node.js was compiled with the --without-v8-platform flag.
ERR_TRANSFORM_ALREADY_TRANSFORMING
A Transform stream finished while it was still transforming.
ERR_TRANSFORM_WITH_LENGTH_0
A Transform stream finished with data still in the write buffer.
ERR_TTY_INIT_FAILED
The initialization of a TTY failed due to a system error.
ERR_UNAVAILABLE_DURING_EXIT
Function was called within a process.on('exit') handler that shouldn't be called within process.on('exit') handler.
ERR_UNCAUGHT_EXCEPTION_CAPTURE_ALREADY_SET
process.setUncaughtExceptionCaptureCallback() was called twice, without first resetting the callback to null.
This error is designed to prevent accidentally overwriting a callback registered from another module.
ERR_UNESCAPED_CHARACTERS
A string that contained unescaped characters was received.
ERR_UNHANDLED_ERROR
An unhandled error occurred (for instance, when an 'error' event is emitted by an EventEmitter but an 'error' handler is not registered).
ERR_UNKNOWN_BUILTIN_MODULE
Used to identify a specific kind of internal Node.js error that should not typically be triggered by user code. Instances of this error point to an internal bug within the Node.js binary itself.
ERR_UNKNOWN_CREDENTIAL
A Unix group or user identifier that does not exist was passed.
ERR_UNKNOWN_ENCODING
An invalid or unknown encoding option was passed to an API.
ERR_UNKNOWN_FILE_EXTENSION
An attempt was made to load a module with an unknown or unsupported file extension.
ERR_UNKNOWN_MODULE_FORMAT
An attempt was made to load a module with an unknown or unsupported format.
ERR_UNKNOWN_SIGNAL
An invalid or unknown process signal was passed to an API expecting a valid signal (such as subprocess.kill()).
ERR_UNSUPPORTED_DIR_IMPORT
import a directory URL is unsupported. Instead, self-reference a package using its name and define a custom subpath in the "exports" field of the package.json file.
import './'; // unsupported import './index.js'; // supported import 'package-name'; // supported copy
ERR_UNSUPPORTED_ESM_URL_SCHEME
import with URL schemes other than file and data is unsupported.
ERR_USE_AFTER_CLOSE
An attempt was made to use something that was already closed.
ERR_VALID_PERFORMANCE_ENTRY_TYPE
While using the Performance Timing API (perf_hooks), no valid performance entry types are found.
ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING
A dynamic import callback was not specified.
ERR_VM_MODULE_ALREADY_LINKED
The module attempted to be linked is not eligible for linking, because of one of the following reasons:
linkingStatus is 'linked')linkingStatus is 'linking')linkingStatus is 'errored')ERR_VM_MODULE_CACHED_DATA_REJECTED
The cachedData option passed to a module constructor is invalid.
ERR_VM_MODULE_CANNOT_CREATE_CACHED_DATA
Cached data cannot be created for modules which have already been evaluated.
ERR_VM_MODULE_DIFFERENT_CONTEXT
The module being returned from the linker function is from a different context than the parent module. Linked modules must share the same context.
ERR_VM_MODULE_LINK_FAILURE
The module was unable to be linked due to a failure.
ERR_VM_MODULE_NOT_MODULE
The fulfilled value of a linking promise is not a vm.Module object.
ERR_VM_MODULE_STATUS
The current module's status does not allow for this operation. The specific meaning of the error depends on the specific function.
ERR_WASI_ALREADY_STARTED
The WASI instance has already started.
ERR_WASI_NOT_STARTED
The WASI instance has not been started.
ERR_WEBASSEMBLY_RESPONSE
The Response that has been passed to WebAssembly.compileStreaming or to WebAssembly.instantiateStreaming is not a valid WebAssembly response.
ERR_WORKER_INIT_FAILED
The Worker initialization failed.
ERR_WORKER_INVALID_EXEC_ARGV
The execArgv option passed to the Worker constructor contains invalid flags.
ERR_WORKER_NOT_RUNNING
An operation failed because the Worker instance is not currently running.
ERR_WORKER_OUT_OF_MEMORY
The Worker instance terminated because it reached its memory limit.
ERR_WORKER_PATH
The path for the main script of a worker is neither an absolute path nor a relative path starting with ./ or ../.
ERR_WORKER_UNSERIALIZABLE_ERROR
All attempts at serializing an uncaught exception from a worker thread failed.
ERR_WORKER_UNSUPPORTED_OPERATION
The requested functionality is not supported in worker threads.
ERR_ZLIB_INITIALIZATION_FAILED
Creation of a zlib object failed due to incorrect configuration.
HPE_HEADER_OVERFLOW
Too much HTTP header data was received. In order to protect against malicious or malconfigured clients, if more than 8 KiB of HTTP header data is received then HTTP parsing will abort without a request or response object being created, and an Error with this code will be emitted.
HPE_UNEXPECTED_CONTENT_LENGTH
Server is sending both a Content-Length header and Transfer-Encoding: chunked.
Transfer-Encoding: chunked allows the server to maintain an HTTP persistent connection for dynamically generated content. In this case, the Content-Length HTTP header cannot be used.
Use Content-Length or Transfer-Encoding: chunked.
MODULE_NOT_FOUND
A module file could not be resolved by the CommonJS modules loader while attempting a require() operation or when loading the program entry point.
ERR_CANNOT_TRANSFER_OBJECT
The value passed to postMessage() contained an object that is not supported for transferring.
ERR_CRYPTO_HASH_DIGEST_NO_UTF16
The UTF-16 encoding was used with hash.digest(). While the hash.digest() method does allow an encoding argument to be passed in, causing the method to return a string rather than a Buffer, the UTF-16 encoding (e.g. ucs or utf16le) is not supported.
ERR_HTTP2_FRAME_ERROR
Used when a failure occurs sending an individual frame on the HTTP/2 session.
ERR_HTTP2_HEADERS_OBJECT
Used when an HTTP/2 Headers Object is expected.
ERR_HTTP2_HEADER_REQUIRED
Used when a required header is missing in an HTTP/2 message.
ERR_HTTP2_INFO_HEADERS_AFTER_RESPOND
HTTP/2 informational headers must only be sent prior to calling the Http2Stream.prototype.respond() method.
ERR_HTTP2_STREAM_CLOSED
Used when an action has been performed on an HTTP/2 Stream that has already been closed.
ERR_HTTP_INVALID_CHAR
Used when an invalid character is found in an HTTP response status message (reason phrase).
ERR_INDEX_OUT_OF_RANGE
A given index was out of the accepted range (e.g. negative offsets).
ERR_INVALID_OPT_VALUE
An invalid or unexpected value was passed in an options object.
ERR_INVALID_OPT_VALUE_ENCODING
An invalid or unknown file encoding was passed.
ERR_MISSING_MESSAGE_PORT_IN_TRANSFER_LIST
This error code was replaced by ERR_MISSING_TRANSFERABLE_IN_TRANSFER_LIST in Node.js v15.0.0, because it is no longer accurate as other types of transferable objects also exist now.
ERR_NAPI_CONS_PROTOTYPE_OBJECT
Used by the Node-API when Constructor.prototype is not an object.
ERR_NETWORK_IMPORT_BAD_RESPONSE
Response was received but was invalid when importing a module over the network.
ERR_NETWORK_IMPORT_DISALLOWED
A network module attempted to load another module that it is not allowed to load. Likely this restriction is for security reasons.
ERR_NO_LONGER_SUPPORTED
A Node.js API was called in an unsupported manner, such as Buffer.write(string, encoding, offset[, length]).
ERR_OPERATION_FAILED
An operation failed. This is typically used to signal the general failure of an asynchronous operation.
ERR_OUTOFMEMORY
Used generically to identify that an operation caused an out of memory condition.
ERR_PARSE_HISTORY_DATA
The node:repl module was unable to parse data from the REPL history file.
ERR_SOCKET_CANNOT_SEND
Data could not be sent on a socket.
ERR_STDERR_CLOSE
An attempt was made to close the process.stderr stream. By design, Node.js does not allow stdout or stderr streams to be closed by user code.
ERR_STDOUT_CLOSE
An attempt was made to close the process.stdout stream. By design, Node.js does not allow stdout or stderr streams to be closed by user code.
ERR_STREAM_READ_NOT_IMPLEMENTED
Used when an attempt is made to use a readable stream that has not implemented readable._read().
ERR_TLS_RENEGOTIATION_FAILED
Used when a TLS renegotiation request has failed in a non-specific way.
ERR_TRANSFERRING_EXTERNALIZED_SHAREDARRAYBUFFER
A SharedArrayBuffer whose memory is not managed by the JavaScript engine or by Node.js was encountered during serialization. Such a SharedArrayBuffer cannot be serialized.
This can only happen when native addons create SharedArrayBuffers in "externalized" mode, or put existing SharedArrayBuffer into externalized mode.
ERR_UNKNOWN_STDIN_TYPE
An attempt was made to launch a Node.js process with an unknown stdin 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.
ERR_UNKNOWN_STREAM_TYPE
An attempt was made to launch a Node.js process with an unknown stdout or stderr 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.
ERR_V8BREAKITERATOR
The V8 BreakIterator API was used but the full ICU data set is not installed.
ERR_VALUE_OUT_OF_RANGE
Used when a given value is out of the accepted range.
ERR_VM_MODULE_NOT_LINKED
The module must be successfully linked before instantiation.
ERR_VM_MODULE_LINKING_ERRORED
The linker function returned a module for which linking has failed.
ERR_WORKER_UNSUPPORTED_EXTENSION
The pathname used for the main script of a worker has an unknown file extension.
ERR_ZLIB_BINDING_CLOSED
Used when an attempt is made to use a zlib object after it has already been closed.
ERR_CPU_USAGE
The native call from process.cpuUsage could not be processed.
© Joyent, Inc. and other Node contributors
Licensed under the MIT License.
Node.js is a trademark of Joyent, Inc. and is used with its permission.
We are not endorsed by or affiliated with Joyent.
https://nodejs.org/api/errors.html