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 a string representing the source code of the object.

This method is usually called internally by JavaScript.



var sym = Symbol()

Return value

A string representing the source code of the object.


The toSource method returns the following values:

For the built-in Symbol object, toSource returns the following string indicating that the source code is not available:

"function Symbol() {
   [native code]

For instances of Symbol, toSource returns a string representing the source code.



Not part of any standard.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support No No36 No No No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No No No36 No No No

See also

Document Tags and Contributors

Contributors to this page: teoli, fscholz, eduardoboucas
Last updated by: teoli,