readl-all-files-in-music-folder.js

var storage = navigator.getDeviceStorage("music");
window.addEventListener("load", function() {
  var cursor = storage.enumerate();
  cursor.onsuccess = function(){
    var file = this.result;
    console.log(file);
    var reader = new FileReader();
    reader.onload = function(){
      var bytes = this.result;
      console.log(bytes);
    };
    reader.readAsArrayBuffer(file);
  };
});