random-password.js

function randomPassword(lenght) {
  function random() {
    return parseFloat('.' + crypto.getRandomValues(new Uint32Array(1))[0]);
  }

  var characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
    password = '',
    i;

  for (i = 0; i < 10; i++)
    characters += characters;

  for (i = 0; i < lenght; i++) {
    password += characters.charAt(Math.floor(random() * characters.length));
  }

  return password;
}