GetTwitchFollowers for Google App Script

GetTwitchFollowers.gs

function GetTwitchFollowers(channelName) {
  var twitchApiOptions = {
    'headers': {
      'Accept': 'application/vnd.twitchtv.v5+json',
      'Client-ID': 'ayb2n4px2z8t5iinjyvf1snlnw1sdw'
    }
  };
  var idx = channelName.lastIndexOf('/');
  if(idx !== -1)
    channelName = channelName.substring(idx + 1);
  var res = UrlFetchApp.fetch('https://api.twitch.tv/kraken/users?login=' + channelName, twitchApiOptions);
  var jObj = JSON.parse(res);
  var channelId = jObj.users[0]._id;
  res = UrlFetchApp.fetch('https://api.twitch.tv/kraken/channels/' + channelId, twitchApiOptions);
  jObj = JSON.parse(res);
  return jObj.followers;
}