How to format a number to a fixed number of decimal places with vanilla JS

Let’s imagine you have a number, pi, with five decimal places.

let pi = 3.14159;

You want to display with only two. How would you do that?

The Number.toFixed() method formats a number to a fixed number of decimal places. Call it on the number, and pass in the number of decimal places as an argument.

It returns a formatted string.

let pi = 3.14159;

// returns "3.14"
pi.toFixed(2);

If you call the Number.toFixed() method on a number that has fewer decimal places than the number specified, 0’s will be added.

let eleven = 11;

// returns "11.000"
eleven.toFixed(3);

Here’s a demo.