Get Youtube video urls

gistfile1.txt

// Run from the dev tools console of any Youtube video
// Accurate as of July 2, 2020.
//
// Copy and paste this into the dev console in a browser with the desired video loaded.
//
// NOTE: Some Youtube videos do not directly expose the video url in the response. 
// This script doesn't currently attempt to handle those. It will work for most other general video types though.

(async () => {
  const html = await fetch(window.location.href).then((resp) => resp.text()).then((text) => text);
  const startStr = 'ytplayer.config = {';
  const start = html.indexOf(startStr) + startStr.length - 1;
  const end = html.indexOf('};', start) + 1;
  const playerObj = JSON.parse(html.slice(start, end));

  playerObj.args.player_response = JSON.parse(playerObj.args.player_response);

  const videoUrls = playerObj.args.player_response.streamingData.adaptiveFormats.reduce((acc, item) => {
    if (!acc[item.quality]) {
      acc[item.quality] = {};
    }

    const mimeType = item.mimeType.split(';')[0];

    acc[item.quality][mimeType] = item;

    return acc;
  }, {});

  console.log('!!', videoUrls);
})();

in what language is it written in? I need to rewrite it to swift

@nysander - did you ever get this converted to Swift?

Nope because Apple is very strict with playback rights and I have dropped idea of this script in my app