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String.prototype.trim() - JavaScript | MDN

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Summary (TL;DR)
The trim() method removes whitespace from both ends of a string and returns a new string without modifying the original. Whitespace includes spaces, tabs, and line terminators. If there is no whitespace at either end, it still returns a copy. Examples show trim() stripping spaces from ' foo ' to produce 'foo'. The method is part of ECMAScript and has related methods trimStart() and trimEnd() for one-sided trimming. The page includes browser compatibility information and notes that it was last updated by MDN contributors.

Try it

const greeting = "   Hello world!   ";

console.log(greeting);
// Expected output: "   Hello world!   ";

console.log(greeting.trim());
// Expected output: "Hello world!";

Syntax

js

trim()

Parameters

None.

Return value

A new string representing str stripped of whitespace from both its beginning and end. Whitespace is defined as white space characters plus line terminators.

If neither the beginning nor the end of str has any whitespace, a new string is still returned (essentially a copy of str).

Examples

Using trim()

The following example trims whitespace from both ends of str.

js

const str = "   foo  ";
console.log(str.trim()); // 'foo'

Specifications

Specification
ECMAScript® 2027 Language Specification
# sec-string.prototype.trim

Browser compatibility

See also

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