How do I Make the First Letter of a String Uppercase in JavaScript?

Matthew C.

—December 15, 2022

The ProblemThe Problem

You want to capitalize the first letter of a string using JavaScript. How do you do this?

The SolutionThe Solution

To make the first letter of a string uppercase, get the first letter, convert it to uppercase, and then add the rest of the string to it:

const str = "name";
const modStr = str[0].toUpperCase() + str.slice(1);
console.log(str); // name
console.log(modStr); // Name

The toUpperCase() method converts a string value to uppercase. The slice() method is used to get all of the characters from index position 1 to the end of the string. The uppercase first letter is concatenated with the rest of the string. This method does not alter the original string.

You can also use the charAt() method to get the first character of the string:

str.charAt(0).toUpperCase() + str.slice(1);