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Array.prototype.toString()

The toString() method returns a string representing the specified array and its elements.

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Syntax

toString()

Return value

A string representing the elements of the array.

Description

The Array object overrides the toString method of Object. The toString method of arrays calls join() internally, which joins the array and returns one string containing each array element separated by commas. If the join method is unavailable or is not a function, Object.prototype.toString is used instead, returning [object Array].

const arr = [];
arr.join = 1; // re-assign `join` with a non-function
console.log(arr.toString()); // Logs [object Array]

console.log(Array.prototype.toString.call({ join: () => 1 }));  // Logs 1

JavaScript calls the toString method automatically when an array is to be represented as a text value or when an array is referred to in a string concatenation.

Examples

Using toString

const array1 = [1, 2, 'a', '1a'];

console.log(array1.toString());
// expected output: "1,2,a,1a"

Specifications

Specification
ECMAScript Language Specification # sec-array.prototype.tostring

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
`toString`	1	12	1	4	4	1	≤37	18	4	10.1	1	1.0	1.0	0.10.0