Insert whitespace after every 3 character in a string Javascript

Question

I need to display a price in a format like

7
70 
700
700 000
70 000
700 000
7 000 000 etc

The problem is that I receive the price from json file, so it's always a string.

What I want is to convert that price string into the desired format by RegEx.

1. We invert the price 7000000 = 0000007
2. We put a whitespace after 3rd character in the inverted string 000 000 7
3. Then we invert the string again and get a normal price format 7 000 000

Is it possible for json data and perhaps there is a more correct way to go? Didn't find any working examples.

Answer 1

You could use a regex to do so:

function numberWithSpaces(x) {
    return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, " ");
}

Or convert it to a number then use num.toLocaleString(), which will automatically convert it.

Taken from Adding space between numbers?