How to capitalize the first letter of a string in JavaScript?

December 30, 2021

To capitalize the first letter in JavaScript, do this: string.charAt(0).toUpperCase() + string.substring(1).

Here's how you do it:

const string = 'hello world!';
const capitalized = string.charAt(0).toUpperCase() + string.substring(1);

console.log(capitalized); // Hello world!