Format Numbers with Commas in JavaScript

In most cases, you will want to format numbers in JavaScript with commas, especially when the numbers are large.

Reading large numbers is a lot easier when there are commas in them.

In this post, we'll learn how to format numbers in JavaScript with commas.

toLocaleString()

The best way to format numbers in JavaScript is to use the toLocaleString() method. This method exists on the Number object and will return a string with the number formatted with commas.

If you live in the US, you can pass the method a locale string of en-US to format the number with commas.

Let's look at how to format a number with commas in JavaScript:

	const number = 123456789;

const formattedNumber = number.toLocaleString("en-US");

console.log(formattedNumber); // 1,234,567,890

It even works for floating point numbers:

	const number = 12345.6789;

const formattedNumber = number.toLocaleString("en-US");

console.log(formattedNumber); // 12,345.679

The great thing about using toLocaleString() is that it will work for any locale. If you want to format a number with periods like in Germany, you can pass the method a locale string of de-DE to format the number with periods.

Here's an example of that:

	const number = 123456789;

const formattedNumber = number.toLocaleString("de-DE");

console.log(formattedNumber); // 123.456.789

How cool is that? Now you can format numbers in JavaScript with commas or periods, depending on the locale.

Conclusion

In this post, we took a look at how to format numbers in JavaScript with commas. We also looked at how to format numbers with periods, by simply passing the toLocaleString() method a different locale string.

Hopefully, this has helped you understand how to format numbers in JavaScript.

Thanks for reading!

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