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Error.prototype.name - JavaScript | MDN
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  1. Web
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  4. Standard built-in objects
  5. Error
  6. name
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Error.prototype.name

Baseline Widely available

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

The name data property of Error.prototype is shared by all Error instances. It represents the name for the type of error. For Error.prototype.name, the initial value is "Error". Subclasses like TypeError and SyntaxError provide their own name properties.

In this article

Value

A string. For Error.prototype.name, the initial value is "Error".

Property attributes of Error.prototype.name
Writableyes
Enumerableno
Configurableyes

Description

By default, Error instances are given the name "Error". The name property, in addition to the message property, is used by the Error.prototype.toString() method to create a string representation of the error.

Examples

Throwing a custom error

js
const e = new Error("Malformed input"); // e.name is 'Error'

e.name = "ParseError";
throw e;
// e.toString() would return 'ParseError: Malformed input'

Specifications

Specification
ECMAScript 2027 LanguageSpecification
# sec-error.prototype.name

Browser compatibility

See also

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This page was last modified on Jul 10, 2025 by MDN contributors.

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  1. Standard built-in objects
  2. Error
  3. Constructor
    1. Error()
  4. Static methods
    1. captureStackTrace()
    2. isError()
  5. Static properties
    1. stackTraceLimit
  6. Instance methods
    1. toString()
  7. Instance properties
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    3. fileName
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  10. Static methods
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  12. Instance methods
    1. __defineGetter__()
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  13. Instance properties
    1. __proto__
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  14. Related pages
  15. AggregateError
  16. EvalError
  17. InternalError
  18. RangeError
  19. ReferenceError
  20. SyntaxError
  21. TypeError
  22. URIError
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