format string as number js code example

Example 1: javascript convert a number in string

const num = 123; //> type number 123
const str = num.toString(); //> type string "123"

Example 2: convert a string to number in javascript

var x = parseInt("1000", 10); // you want to use radix 10
    // so you get a decimal number even with a leading 0 and an old browser ([IE8, Firefox 20, Chrome 22 and older][1])