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    The toString() method returns a string representing the source code of the function.




    indentation Obsolete since Gecko 17
    The amount of spaces to indent the string representation of the source code. If indentation is less than or equal to -1, most unnecessary spaces are removed.


    The Function object overrides the toString method inherited from Object; it does not inherit Object.prototype.toString. For Function objects, the toString method returns a string representation of the object in the form of a function declaration. That is, toString decompiles the function, and the string returned includes the function keyword, the argument list, curly braces, and the source of the function body.

    JavaScript calls the toString method automatically when a Function is to be represented as a text value, e.g. when a function is concatenated with a string.


    Specification Status Comment
    ECMAScript 1st Edition. Standard Initial definition. Implemented in JavaScript 1.1.
    ECMAScript 5.1 (ECMA-262)
    The definition of 'Function.prototype.toString' in that specification.
    ECMAScript 6 (ECMA-262)
    The definition of 'Function.prototype.toString' in that specification.

    Browser compatibility

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    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)

    Gecko-specific notes

    Since Gecko 17.0 (Firefox 17 / Thunderbird 17 / SeaMonkey 2.14), Function.prototype.toString() has been implemented by saving the function's source. The decompiler was removed, so that the indentation parameter is not needed any more. See bug 761723 for more details.

    See also

    Document Tags and Contributors

    Last updated by: Mingun,