Generate random string

random-string.js

/**
 * From https://github.com/spotify/web-api-auth-examples/blob/master/authorization_code/app.js#L25-L33
 * Generates a random string containing numbers and letters
 * @param  {number} length The length of the string
 * @return {string} The generated string
 */
var generateRandomString = function(length) {
  var text = '';
  var possible = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';

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

From https://github.com/spotify/web-api-auth-examples/blob/master/authorization_code/app.js#L25-L33