--- a/index.html	Sun Nov 05 20:16:29 2017 +0800
+++ b/index.html	Sun Nov 05 20:26:55 2017 +0800
@@ -141,7 +141,7 @@
             loadArrayBuffer(url, function(xhr) {
               player.load(xhr.response);
               front.$el.removeClass('uk-hidden');
-              $('[data-debug]').text(JSON.stringify(player.tracks.toJSON()));
+              $('[data-debug]').text(JSON.stringify(player.tracks.toJSON(), undefined, 4));
               if (player.tracks.length > 0) {
                 player.startTrack(0);
                 if (player.get('autoplay')) {