String.prototype.trim()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The trim() method of String values removes whitespace from both ends of this string and returns a new string, without modifying the original string.
To return a new string with whitespace trimmed from just one end, use trimStart() or trimEnd().
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 or 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® 2026 Language Specification # sec-string.prototype.trim |