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

At first, you need to split() the string on the basis of space and extract the first character using charAt(). Use toUpperCase() for the extracted character.

Example

function capitalizeTheFirstLetterOfEachWord(words) {
   var separateWord = words.toLowerCase().split(' ');
   for (var i = 0; i < separateWord.length; i++) {
      separateWord[i] = separateWord[i].charAt(0).toUpperCase() +
      separateWord[i].substring(1);
   }
   return separateWord.join(' ');
}
console.log(capitalizeTheFirstLetterOfEachWord("my name is john"));

To run the above program, you need to use the following command −

node fileName.js.

Here, my file name is demo43.js.

Output

This will produce the following output with first letter capitalize −

PS C:\Users\Amit\JavaScript-code> node demo43.js
My Name Is John