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The toLowerCase() method returns the calling string value converted to lower case.
Syntax
str.toLowerCase()Return value
A new string representing the calling string converted to lower case.
Description
The toLowerCase() method returns the value of the string converted to lower case. toLowerCase() does not affect the value of the string str itself.
Examples
Using toLowerCase()
console.log('ALPHABET'.toLowerCase()); // 'alphabet'
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.0. |
| ECMAScript 5.1 (ECMA-262) The definition of 'String.prototype.toLowerCase' in that specification. |
Standard | |
| ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'String.prototype.toLowerCase' in that specification. |
Standard | |
| ECMAScript Latest Draft (ECMA-262) The definition of 'String.prototype.toLowerCase' in that specification. |
Draft |
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.
| Feature | Chrome | Firefox | Edge | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
|---|---|---|---|---|---|---|---|
| Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |