uneval()

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 uneval() function creates a string representation of the source code of an Object.

Syntax

uneval(object)

Parameters

object
A JavaScript expression or statement.

Return value

A string representing the source code of object.

Note: This will not return a JSON representation of object.

Description

uneval() is a top-level function and is not associated with any object.

Examples

var a = 1;
uneval(a); // returns a String containing 1

var b = '1';
uneval(b); // returns a String containing "1"

uneval(function foo() {}); // returns "(function foo(){})"


var a = uneval(function foo() { return 'hi'; });
var foo = eval(a);
foo(); // returns "hi"

Specifications

Not part of any specifications.

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
uneval()
DeprecatedNon-standard
Chrome No support NoEdge No support NoFirefox No support 1 — 74
Notes
No support 1 — 74
Notes
Notes Starting in Firefox 74, uneval() is no longer available for use by web content. It is still allowed for internal and privileged code.
IE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoFirefox Android Full support 4Opera Android No support NoSafari iOS No support NoSamsung Internet Android No support Nonodejs No support No

Legend

Full support  
Full support
No support  
No support
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.
See implementation notes.
See implementation notes.

See also