The trim()
method removes whitespace from both ends of a string. Whitespace in this context is all the whitespace characters (space, tab, no-break space, etc.) and all the line terminator characters (LF, CR, etc.).
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
Syntax
str.trim()
Return value
A new string representing the str
stripped of whitespace from both ends.
Description
The trim()
method returns the string stripped of whitespace from both ends. trim()
does not affect the value of the str
itself.
Polyfill
Running the following code before any other code will create trim()
if it's not natively available.
if (!String.prototype.trim) { String.prototype.trim = function () { return this.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, ''); }; }
Examples
Using trim()
The following example displays the lowercase string 'foo'
:
var orig = ' foo '; console.log(orig.trim()); // 'foo' // Another example of .trim() removing whitespace from just one side. var orig = 'foo '; console.log(orig.trim()); // 'foo'
Specifications
Specification |
---|
ECMAScript (ECMA-262) The definition of 'String.prototype.trim' in that specification. |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
trim | Chrome Full support 4 | Edge Full support 12 | Firefox Full support 3.5 | IE Full support 9 | Opera Full support 10.5 | Safari Full support 5 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support 11 | Safari iOS Full support 5 | Samsung Internet Android Full support 1.0 | nodejs Full support 0.1.100 |
Legend
- Full support
- Full support