String.prototype.repeat()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.

The repeat() method of String values constructs and returns a new string which contains the specified number of copies of this string, concatenated together.

Try it

const mood = "Happy! ";

console.log(`I feel ${mood.repeat(3)}`);
// Expected output: "I feel Happy! Happy! Happy! "

Syntax

js
repeat(count)

Parameters

count

An integer between 0 and +Infinity, indicating the number of times to repeat the string.

Return value

A new string containing the specified number of copies of the given string.

Exceptions

RangeError

Thrown if count is negative or if count overflows maximum string length.

Examples

Using repeat()

js
"abc".repeat(-1); // RangeError
"abc".repeat(0); // ''
"abc".repeat(1); // 'abc'
"abc".repeat(2); // 'abcabc'
"abc".repeat(3.5); // 'abcabcabc' (count will be converted to integer)
"abc".repeat(1 / 0); // RangeError

({ toString: () => "abc", repeat: String.prototype.repeat }).repeat(2);
// 'abcabc' (repeat() is a generic method)

Specifications

Specification
ECMAScript® 2025 Language Specification
# sec-string.prototype.repeat

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
repeat

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

See also