Sometimes, we want to format numbers and strings with thousand separator with JavaScript.

In this article, we’ll look at how to format numbers and strings with thousand separator with JavaScript.

How to format numbers and strings with thousand separator with JavaScript?

To format numbers with thousand separator with JavaScript, we can use the number toLocaleString method.

For instance, we write

const a = (1234567.89).toLocaleString('en')  
const b = parseFloat("1234567.89").toLocaleString('en')

to call toLocaleString with the locale of the returned formatted number string.

We convert the number string with parseFloat before we call toLocaleString on it since toLocaleString is a number method.

Conclusion

To format numbers with thousand separator with JavaScript, we can use the number toLocaleString method.