Converting a string to lowercase in JavaScript

To convert a string to lowercase, we can use the built-in toLowerCase() method in JavaScript.

Here is an example that converts a string How ARE YOU to lowercase.

const message = "How ARE YOU";

const lowercaseMsg = message.toLowerCase();

console.log(lowercaseMsg);

Output:

'how are you'

How to lowercase the first letter of a string ?

To lowercase the first letter, we need to take the first letter in the string by using the charAt() method then chain it to toLowerCase method and concat with the string by slicing the first letter.

const name = "JAVASCRIPT";

console.log( name.charAt(0).toLowerCase()+name.slice(1));

// "jAVASCRIPT"

Note: the toLowerCase method doesn’t mutate the original string instead of it returns the new string with the lower case letters.