function idGen(){ let array = []; for(let i=0; i<=5; i++){ let id = Math.floor((Math.random()*1000)+100); array.push(id); } let convert = array.join("-"); return convert;//Example: 816-728-1013-821-908-660 }//you can just use date as id Date.now() // returns 1576996323453$ npm install uuid const uuidv4 = require("uuid/v4") uuidv4() // expected: 1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed