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                <audio id="youtube" controls></audio>





                // YouTube video ID
var videoID = "CMNry4PE93Y";

// Fetch video info (using a proxy to avoid CORS errors)
fetch('' + "" + videoID).then(response => {

  if (response.ok) {
    response.text().then(ytData => {
      // parse response to find audio info
      var ytData = parse_str(ytData);
      var getAdaptiveFormats = JSON.parse(ytData.player_response).streamingData.adaptiveFormats;
      var findAudioInfo = getAdaptiveFormats.findIndex(obj => obj.audioQuality);
      // get the URL for the audio file
      var audioURL = getAdaptiveFormats[findAudioInfo].url;
      // update the <audio> element src
      var youtubeAudio = document.getElementById('youtube');
      youtubeAudio.src = audioURL;

function parse_str(str) {
  return str.split('&').reduce(function(params, param) {
    var paramSplit = param.split('=').map(function(value) {
      return decodeURIComponent(value.replace('+', ' '));
    params[paramSplit[0]] = paramSplit[1];
    return params;
  }, {});