Random hash in hexa: In nodejs (randomHash.js) In browser (randomHashBrowser.js)

randomHash.js

var crypto = require('crypto');
crypto.randomBytes(16).toString('hex');
// 'e834ba2133229fb78a693f5ca3ae05de'

randomHashBrowser.js

function randomString(length, chars) {
    var result = '';
    for(var i = length; i > 0; --i){ 
      result += chars[Math.round(Math.random() * (chars.length - 1))]; 
    }
    return result;
}

function randomId(size){ 
  return randomString(size || 32 , '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'); 
}