JavaScript trim() Method

Example

Remove whitespace from both ends of a string:

var str = "  ";
alert(str.trim());

Output:

Try it yourself »

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Definition and Usage

The trim() method removes whitespace from both ends of a string. Whitespace includes spaces, tabs, line breaks, and other whitespace characters.

The trim() method does not change the original string.

The trim() method is not applicable to null, undefined, or Number types.

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Browser Support

The numbers in the table specify the first browser version that fully supports the method.

Method
trim()	10.0	9.0	3.5	5.0	10.5

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Syntax

string.trim()

Parameters

None.

Return Value

Type	Description
String	Returns the string with whitespace removed from both ends.

Technical Details

JavaScript Version:

ECMAScript 5

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More Examples

Example

If your browser does not support the trim() method, you can use a regular expression to achieve the same result:

function myTrim(x) {
    return x.replace(/^s+|s+$/gm, '');
}

function myFunction() {
    var str = myTrim("  ");
    alert(str);
}

Output:

Try it yourself »

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