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How to convert string to uppercase in JavaScript?

If you want to convert all the letters in a string to uppercase, then use the toUpperCase() method. It is important to note that the toUpperCase() method does not modify the original string and returns a new string having all characters in uppercase.

The syntax for the toUpperCase() method is:

let upperCaseString = string.toUpperCase();

The following example converts all the characters in a string to uppercase:

let str = "JavaScript String";
let newString = str.toUpperCase();

console.log(newString); //JAVASCRIPT STRING
console.log(str); //JavaScript String