The function that creates 256 bits random string token

random_token.js

function randomToken(length) {
  var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz0123456789+/'
    , string = ''
    , randomNumber
    , i;

  length = length ? length : 32;

  for (i = 0; i < length; i++) {
    randomNumber = Math.floor(Math.random() * chars.length);
    string += chars.substring(randomNumber, randomNumber + 1);
  }
  return string;
};