Skip to content

How to format a number as a currency value in JavaScript

Learn how to convert a number into a currency value, using the JavaScript Internationalization API

Say you have a number like 10, and it represents the price of something.

You want to transform it to $10,00.

If the number has more than 3 digits however it should be displayed differently, for example 1000 should be displayed as $1,000.00

This is in USD, however.

Different countries have different conventions to display values.

JavaScript makes it very easy for us with the ECMAScript Internationalization API, a relatively recent browser API that provides a lot of internationalization features, like dates and time formatting.

It is very well supported:

Browser support for the internationalization API

const formatter = new Intl.NumberFormat('en-US', {
  style: 'currency',
  currency: 'USD',
  minimumFractionDigits: 2

formatter.format(1000) // "$1,000.00"
formatter.format(10) // "$10.00"
formatter.format(123233000) // "$123,233,000.00"

The minimumFractionDigits property sets the fraction part to be always at least 2 digits. You can check which other parameters you can use in the NumberFormat MDN page.

This example creates a number formatter for the Euro currency, for the Italian country:

const formatter = new Intl.NumberFormat('it-IT', {
  style: 'currency',
  currency: 'EUR'
→ Download my free JavaScript Handbook!



You might be interested in those things I do:

  • Learn to code in THE VALLEY OF CODE, your your web development manual
  • Find a ton of Web Development projects to learn modern tech stacks in practice in THE VALLEY OF CODE PRO
  • I wrote 16 books for beginner software developers, DOWNLOAD THEM NOW
  • Every year I organize a hands-on cohort course coding BOOTCAMP to teach you how to build a complex, modern Web Application in practice (next edition February-March-April-May 2024)
  • Learn how to start a solopreneur business on the Internet with SOLO LAB (next edition in 2024)
  • Find me on X

Related posts that talk about js: