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String.prototype.toString()

The toString() method of String values returns this string value.

Try it

Syntax

js
toString()

Parameters

None.

Return value

A string representing the specified string value.

Description

The String object overrides the toString method of Object; it does not inherit Object.prototype.toString(). For String values, the toString method returns the string itself (if it's a primitive) or the string that the String object wraps. It has the exact same implementation as String.prototype.valueOf().

The toString() method requires its this value to be a String primitive or wrapper object. It throws a TypeError for other this values without attempting to coerce them to string values.

Because String doesn't have a [@@toPrimitive]() method, JavaScript calls the toString() method automatically when a String object is used in a context expecting a string, such as in a template literal. However, String primitive values do not consult the toString() method to be coerced to strings — since they are already strings, no conversion is performed.

js
String.prototype.toString = () => "Overridden";
console.log(`${"foo"}`); // "foo"
console.log(`${new String("foo")}`); // "Overridden"

Examples

Using toString()

The following example displays the string value of a String object:

js
const x = new String("Hello world");

console.log(x.toString()); // "Hello world"

Specifications

Browser compatibility

Desktop Mobile Server
Chrome Edge Firefox Opera Safari Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet WebView Android Deno Node.js
toString 1 12 1 3 1 18 4 10.1 1 1.0 4.4 1.0 0.10.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toString