generate 15 digit random number in javascript code example

Example 1: create random 4 digit number js

var val = Math.floor(1000 + Math.random() * 9000);
console.log(val);

Example 2: javascript get a random number with 6 digits

Math.floor(100000 + Math.random() * 900000);

Example 3: javascript random 4 digit number

var seq = (Math.floor(Math.random() * 10000) + 10000).toString().substring(1);
console.log(seq);