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DOMException

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

* Some parts of this feature may have varying levels of support.

Note: This feature is available in Web Workers.

The DOMException interface represents an abnormal event (called an exception) that occurs as a result of calling a method or accessing a property of a web API. This is how error conditions are described in web APIs.

Each exception has a name, which is a short "PascalCase"-style string identifying the error or abnormal condition.

DOMException is a Serializable object, so it can be cloned with structuredClone() or copied between Workers using postMessage().

Constructor

DOMException(): Returns a DOMException object with a specified message and name.

Instance properties

DOMException.code Deprecated Read only: Returns one of the legacy error code constants, or 0 if none match.
DOMException.message Read only: Returns a string representing a message or description associated with the given error name.
DOMException.name Read only: Returns a string that contains one of the strings associated with an error name.

Error names

Common error names are listed here. Some APIs define their own sets of names, so this is not necessarily a complete list.

The following deprecated historical errors don't have an error name but instead have only a legacy constant code value and a legacy constant name:

Legacy code value: 2, legacy constant name: DOMSTRING_SIZE_ERR
Legacy code value: 6, legacy constant name: NO_DATA_ALLOWED_ERR
Legacy code value: 16, legacy constant name: VALIDATION_ERR

Note: Because historically the errors were identified by a numeric value that corresponded with a named variable defined to have that value, some of the entries below indicate the legacy code value and constant name that were used in the past.

IndexSizeError: The index is not in the allowed range. For example, this can be thrown by the Range object. (Legacy code value: 1 and legacy constant name: INDEX_SIZE_ERR)
HierarchyRequestError: The node tree hierarchy is not correct. (Legacy code value: 3 and legacy constant name: HIERARCHY_REQUEST_ERR)
WrongDocumentError: The object is in the wrong Document. (Legacy code value: 4 and legacy constant name: WRONG_DOCUMENT_ERR)
InvalidCharacterError: The string contains invalid characters. (Legacy code value: 5 and legacy constant name: INVALID_CHARACTER_ERR)
NoModificationAllowedError: The object cannot be modified. (Legacy code value: 7 and legacy constant name: NO_MODIFICATION_ALLOWED_ERR)
NotFoundError: The object cannot be found here. (Legacy code value: 8 and legacy constant name: NOT_FOUND_ERR)
NotSupportedError: The operation is not supported. (Legacy code value: 9 and legacy constant name: NOT_SUPPORTED_ERR)
InUseAttributeError: The attribute is in use. (Legacy code value: 10 and legacy constant name: INUSE_ATTRIBUTE_ERR)
InvalidStateError: The object is in an invalid state. (Legacy code value: 11 and legacy constant name: INVALID_STATE_ERR)
SyntaxError: The string did not match the expected pattern. (Legacy code value: 12 and legacy constant name: SYNTAX_ERR)
InvalidModificationError: The object cannot be modified in this way. (Legacy code value: 13 and legacy constant name: INVALID_MODIFICATION_ERR)
NamespaceError: The operation is not allowed by Namespaces in XML. (Legacy code value: 14 and legacy constant name: NAMESPACE_ERR)
InvalidAccessError: The object does not support the operation or argument. (Legacy code value: 15 and legacy constant name: INVALID_ACCESS_ERR)
TypeMismatchError Deprecated: The type of the object does not match the expected type. (Legacy code value: 17 and legacy constant name: TYPE_MISMATCH_ERR) This value is deprecated; the JavaScript TypeError exception is now raised instead of a DOMException with this value.
SecurityError: The operation is insecure. (Legacy code value: 18 and legacy constant name: SECURITY_ERR)
NetworkError Experimental: A network error occurred. (Legacy code value: 19 and legacy constant name: NETWORK_ERR)
AbortError Experimental: The operation was aborted. (Legacy code value: 20 and legacy constant name: ABORT_ERR)
URLMismatchError Experimental: The given URL does not match another URL. (Legacy code value: 21 and legacy constant name: URL_MISMATCH_ERR)
QuotaExceededError: The quota has been exceeded. (Legacy code value: 22 and legacy constant name: QUOTA_EXCEEDED_ERR) It is a proper interface that derives from DOMException.
TimeoutError: The operation timed out. (Legacy code value: 23 and legacy constant name: TIMEOUT_ERR)
InvalidNodeTypeError Experimental: The node is incorrect or has an incorrect ancestor for this operation. (Legacy code value: 24 and legacy constant name: INVALID_NODE_TYPE_ERR)
DataCloneError Experimental: The object can not be cloned. (Legacy code value: 25 and legacy constant name: DATA_CLONE_ERR)
EncodingError Experimental: The encoding or decoding operation failed (No legacy code value and constant name).
NotReadableError Experimental: The input/output read operation failed (No legacy code value and constant name).
UnknownError Experimental: The operation failed for an unknown transient reason (e.g., out of memory) (No legacy code value and constant name).
ConstraintError Experimental: A mutation operation in a transaction failed because a constraint was not satisfied (No legacy code value and constant name).
DataError Experimental: Provided data is inadequate (No legacy code value and constant name).
TransactionInactiveError Experimental: A request was placed against a transaction that is currently not active or is finished (No legacy code value and constant name).
ReadOnlyError Experimental: The mutating operation was attempted in a "readonly" transaction (No legacy code value and constant name).
VersionError Experimental: An attempt was made to open a database using a lower version than the existing version (No legacy code value and constant name).
OperationError Experimental: The operation failed for an operation-specific reason (No legacy code value and constant name).
NotAllowedError: The request is not allowed by the user agent or the platform in the current context, possibly because the user denied permission (No legacy code value and constant name).

Specifications

Specification
Web IDL> # idl-DOMException>

Browser compatibility