How to Parse String with Commas to Number in JavaScript

When you're working with external data or APIs, sometimes you will get back numbers in the form of strings.

The problem with this is that sometimes, these numbers will include commas, which will make it harder to parse.

There are several ways to address this issue. In this post, we'll look at the best solution for parsing a string with commas into a number.

Removing the commas

The most straightforward way to convert a string with commas into a number is to simply remove the commas in the string first.

Let's start with our example string:

	const string = "1,000,000";

Now we'll use the replace method to globally replace all commas with an empty string, essentially removing the commas:

	const string = "1,000,000";

const stripped = string.replace(/,/g, "");

Alternatively, we can use the replaceAll method to replace all commas with an empty string:

	const string = "1,000,000";

const stripped = string.replaceAll(",", "");

Either way, from here we can just use the parseFloat method to convert the string into a number:

	const string = "1,000,000";

const stripped = string.replace(/,/g, "");

const number = parseFloat(stripped);

console.log(number);

	1000000

Alternatively, if you want an integer, you can use the parseInt method:

	const string = "1,000,000";

const stripped = string.replace(/,/g, "");

const number = parseInt(stripped);

console.log(number);

	1000000

As long as the string does not contain any non-numeric characters, it will successfully parse into a number that you can use.

Conclusion

In this post, we learned how to remove commas from a string and then parse it into a number.

You can use either the replace or replaceAll methods to remove commas from a string, then use parseFloat or parseInt to convert the string into a number.

Thanks for reading and happy coding!

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