Format Numbers as Currency Strings in JavaScript

This tutorial shows how to format numbers as currency strings in JavaScript. In JavaScript, we can do this by:

• Using Intl.NumberFormat()
• Using toLocaleString()
• Using RegEx

Example 1: Using Intl.NumberFormat()

// program to format numbers as currency string
const formatter = new Intl.NumberFormat('en-US', {
    style: 'currency',
    currency: 'USD'
});

console.log(formatter.format(5500));

Output

$5,500.00

Example 2: Using toLocaleString()

// program to format numbers as currency string
const example  = (5500).toLocaleString('en-US', {
    style: 'currency',
    currency: 'USD'
});

console.log(example);

Output

$5,500.00

Example 3: Using Regex

// program to format numbers as currency string

const result = 5500.1234.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,'); 


console.log('$ ' + result);

Output

$ 5,500.12