JavaScript thousand separator code example

Example 1: number with commas js

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

Example 2: js format number thousands separator

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

Example 3: javascript format numbers with commas

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

Example 4: format number with commas js

foramtNumber = (num,div=",")=>{
  return num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, div);

}

Example 5: commas for thousands js

var number = 3500;

console.log(new Intl.NumberFormat().format(number));
// → '3,500' if in US English locale

Example 6: how to format an integer with a comma in javascript

x.toString().toLocaleString(); // x must be a number