Fetch YouTube Video URLs

// To test this, copy and past into the dev console of Google Chorme. 
// credit:
// https://gist.github.com/geuis/8b1b2ea57d7f9a9ae22f80d4fbf5b97f#gistcomment-3436392

(async () => {
  html = await fetch(window.location.href).then(resp => resp.text()).then(text => text);
  startStr = 'ytplayer.config = {';
  start = html.indexOf(startStr) + startStr.length - 1;
  end = html.indexOf('};', start) + 1;
  playerObj = JSON.parse(html.slice(start, end));
  playerObj.args.player_response = JSON.parse(playerObj.args.player_response);
  videoUrls = playerObj.args.player_response.streamingData.formats[1].url;
  videoUrls = videoUrls.replace('"', 'r');
  return console.log(videoUrls);
})();