Standalone emergency player for Radio4000 --> http://jsbin.com/kiyudepuyo/edit?html,output

index.html

<div id="ytplayer"></div>

youtube-player-from-r4-backup.js

var player

function playRadio(slug) {
var endpoint = `https://api.radio4000.com/backup?slug=${slug}`

fetch(endpoint)
	.then(res => res.json())
	.then(backup => {
		var playlist = backup.tracks.map(t => t.ytid)	
		player.loadPlaylist({playlist})
	})
}

// The API will call this function when the video player is ready.	
function onPlayerReady(event) {	
	playRadio('200ok')
}	

// This code loads the IFrame Player API code asynchronously.	
var tag = document.createElement('script')
tag.src = 'https://www.youtube.com/iframe_api'
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

window.onYouTubeIframeAPIReady = function () {	
	player = new YT.Player('ytplayer', {	
		height: '390',	
		width: '640',	
		events: {	
			'onReady': onPlayerReady	
		}	
	})
}