Convert String to Lowercase JavaScript

John on February 10, 2022

To convert a string into lowercase in JavaScript use the toLowerCase() function.

toLowerCase() Syntax

Pass the string to convert before the toLowerCase() function using a . (dot).

string.toLowerCase()

toLowerCase() accepts no arguments and does not modify the original string, so you'll need to store the result in a variable or use it immediately.

JavaScript Lowercase Example

Here is an example of converting a string containing letters in mixed casing to lowercase.

var  hello = 'hElLo WoRlD!';

console.log(hello.toLowerCase());

hello world!