This is the gist for How to Obtain Random Numbers Within a Range Using JavaScript.

randomnumber.js

const randomNumber = (a, b) => { 
    var min = a > b ? b : a
    var max = a > b ? a : b 
    //Use below if final number doesn't need to be whole number
    //return Math.random() * (max - min + 1) + min;
    return Math.floor(Math.random() * (max - min + 1) + min);
}