Error.prototype

The Error.prototype property represents the prototype for the Error constructor.

Property attributes of `Error.prototype`
Writable	no
Enumerable	no
Configurable	no

Description

All Error instances and instances of non-generic errors inherit from Error.prototype. As with all constructor functions, you can use the prototype of the constructor to add properties or methods to all instances created with that constructor.

Properties

Standard properties

Error.prototype.constructor: Specifies the function that created an instance's prototype.
Error.prototype.message: Error message.
Error.prototype.name: Error name.

Vendor-specific extensions

Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

Microsoft

Error.prototype.description: Error description. Similar to message.
Error.prototype.number: Error number.

Mozilla

Error.prototype.fileName: Path to file that raised this error.
Error.prototype.lineNumber: Line number in file that raised this error.
Error.prototype.columnNumber: Column number in line that raised this error.
Error.prototype.stack: Stack trace.

Methods

Error.prototype.toSource(): Returns a string containing the source of the specified Error object; you can use this value to create a new object. Overrides the Object.prototype.toSource() method.
Error.prototype.toString(): Returns a string representing the specified object. Overrides the Object.prototype.toString() method.

Specifications

Specification	Status	Comment
ECMAScript 1st Edition (ECMA-262)	Standard	Initial definition. Implemented in JavaScript 1.1.
ECMAScript 5.1 (ECMA-262) The definition of 'Error' in that specification.	Standard
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Error' in that specification.	Standard
ECMAScript 2017 Draft (ECMA-262) The definition of 'Error' in that specification.	Draft

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)

Feature	Android	Chrome for Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)