js generate a random key code example

Example 1: random string js

const string_length = 10
[...Array(string_length)].map(i=>(~~(Math.random()*36)).toString(36)).join('')

Example 2: how to generate random character from an array js

function makeid() {
  var text = "";
  var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

  for (var i = 0; i < 5; i++)
    text += possible.charAt(Math.floor(Math.random() * possible.length));

  return text;
}

console.log(makeid());