Convert String to Lowercase JavaScript

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).




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!';

hello world!