Separate Numbers with Commas in JavaScript

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In this article, I will introduce how to separate numbers with commas in JavaScript.

The toLocaleString() method

The easiest way to get a comma separated string is to use the toLocaleString method.

The syntax is below.

toLocaleString(locales, options)

The following is the basic usage without specifying the locale.

const num = 123456789;
console.log(num.toLocaleString()); // 123,456,789

If you specify locales, you can get the string corresponding to the output format of each country.

const number = 123456.789;

// German
console.log(number.toLocaleString('de-DE')); // 123.456,789

// Arabic
console.log(number.toLocaleString('ar-EG')); // ١٢٣٤٥٦٫٧٨٩

// India
console.log(number.toLocaleString('en-IN')); // 1,23,456.789

By specifying the argument option, you can add a unit of money or specify the number of decimal places according to the output format of each country.

const num = 12345.6789
console.log(num.toLocaleString('ja-JP', { style: 'currency', currency: 'JPY',minimumFractionDigits: 2, maximumFractionDigits: 2 }))
// ¥12,345.68
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The replace() method

You can get a comma-separated string by using the replace method and a regular expression as shown below.

"12345".replace(/(d)(?=(ddd)+(?!d))/g, '$1,');
// "12,345"