While working with strings in JavaScript, you can perform different operations on them.

The operations you might perform on strings include capitalization, conversion to lowercase, adding symbols within words, and many more.

In this article, I will show you how to convert a string to uppercase letters with the .toUpperCase() string method.

Basic Syntax of the .toUpperCase() Method

To use the .toUpperCase() method, assign the string you want to change to uppercase to a variable and then prepend it with .toUpperCase().

How to Capitalize a String with .toUpperCase

As already stated, you can assign a string to a variable and then use the .toUpperCase() method to capitalize it

const name = "freeCodeCamp";
const uppercase = name.toUpperCase();


You can also write a function and return .toUpperCase() in it, so a stated parameter will be capitalized when the function is called.

function changeToUpperCase(founder) {
  return founder.toUpperCase();

// calling the function 
const result = changeToUpperCase("Quincy Larson");

// printing the result to the console


In the script above:

  • I defined a function named changeToUpperCase with a placeholder of founder
  • with the return statement inside the function, I told the function that what I want it to do is to change to uppercase letters any parameter I specify when I call it
  • I then assigned the function call - changeToUpperCase to a variable named result
  • with the help of the variable, I was able to print the result of the function to the console


You can use the .toUpperCase() method, fully known as String.prototype.toUpperCase(), when you need to capitalize strings in your JavaScript projects.

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