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How to convert string to lowercase in JavaScript?

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

The syntax for the toLowerCase() method is:

let lowerCaseString = string.toLowerCase();

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

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

console.log(newString); //javascript string
console.log(str); //JavaScript String