base64 to blob (more readable)

b2b-n.js

function b2b(base64) {
    var decode, i, length, byteArray;
    i = 0;
    decode = atob(base64);
    length = decode.length;
    byteArray = new Uint8Array(length);

    for (;i < length;i++) {
      byteArray[i] = decode.charCodeAt(i);
    }
    return new Blob([byteArray]);
  }