string.toLowerCase

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 2017 Draft (ECMA-262) The definition of 'String.prototype.toLowerCase' in that specification.	Draft

Browser compatibility

See also

• String.prototype.toLocaleLowerCase()
• String.prototype.toLocaleUpperCase()
• String.prototype.toUpperCase()