JavaScript Javascript DataView read ID3 Tags javascript dataview read string

I am trying to read the ID3 tags of an music file. Currently i have a Dataview object with the last 128 bits of an audio file in it (because the ID3 tags are at the last 128 bits in a audio file). So at this point i don't know how i go further, how can i read the different part (title, album etc.) from the audio file? (Please dont answer with external scripts or library)

window.onload = function(){
  file = $("file");
  reader = new FileReader();
  reader.onload = function(){
    length = reader.result.byteLength
    dv = new DataView(reader.result, length-128, 128);
  }
  file.onchange = function(e){
    reader.readAsArrayBuffer(e.target.files[0]);
  }
}
Answer:1

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