How to Convert Number into Words in Javascript

In this tutorial, you will learn how to convert number into words in javascript. It is not easy to convert a number to words and you may need to write some sort of complex function to get it done.  If you are a pro javascript developer, then definitely it is possible, but not for newbies.

To solve such problem, there are a bunch of libraries written by a lot of javascript developers.  We are going to use one of them to accomplish our goal. The library that we are going to use is number-to-words because it is very simple and easy to use.

In the following example, we will enter some random number in the input field and upon click of a button, we will convert that number into words and display it on the screen.  Please have a look over the code example and the steps given below.


  • We have a few elements in the HTML file and that includes div, button, input, and h1. The div element with a class of container is just a wrapper for the rest of the elements.
  • The inner text for the button element is “Convert” and for the h1 element, it is “Output”.
  • We have downloaded the number-to-words library and included it in the HTML file using the script tag at the bottom.
  • We have done some basic styling using CSS and added the link to our style.css stylesheet inside the head element.
  • We have also included our javascript file script.js with a script tag at the bottom.
<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="style.css">
    <div class="container">
            <input type="text">
    <script src="numberToWords.js"></script>
    <script src="script.js"></script>
.container {
    display: flex;
    flex-direction: column;
    align-items: center;


  • We have selected 3 elements button, input, and h1 using document.querySelector() method and stored them in btnConvert, input, and output variables respectively.
  • We have attached the click event listener to the button element.
  • In the event handler function, we are using the toWords() method of the number-to-words library and passing the value of the input element as a parameter.
  • We are displaying the conversion result in the h1 element using the innerText property.
let btnConvet = document.querySelector('button');
let input = document.querySelector('input');
let output = document.querySelector('h1');

btnConvet.addEventListener('click', () => {
    output.innerText = numberToWords.toWords(input.value);