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Error.prototype.toSource()

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.

The toSource() method returns code that could eval to the same error.

Syntax

toSource()

Return value

A string containing the source code of the error.

Examples

Using toSource

Calling the toSource method of an Error instance (including NativeErrors) will return a string containing the source code of the error. This string can be evaluated to create an (approximately) equal object. Naturally, the string containing the source follows the structure of the Error constructor. For example:

(newname(message ,fileName,lineNumber))

where these attributes correspond to the respective properties of the error instance.

Note: Be aware that the properties used by the toSource method in the creation of this string are mutable and may not accurately reflect the function used to create an error instance or the filename or line number where the actual error occurred.

Specifications

Not part of any standard.

Browser compatibility

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	Deno	Node.js
`toSource`	No	No	1-74 Starting in Firefox 74, `toSource()` is no longer available for use by web content. It is still allowed for internal and privileged code.	No	No	No	No	No	4	No	No	No	No	No