Get parameter of GET request
<p>I make a GET request:</p>

<pre><code> createXhrRequest( "GET", fileURL, function( err, response ) {
      if( err ) { alert( "Error GET!" ); }
      alert(response);
 });
</code></pre>

<p>and I get this full response:</p>

<blockquote>
  <p>{ "status" : "ok", "message" :
  "JVBERi0xLjQKJdDUxdgKMy</p>
</blockquote>

<p>How can I get only <code>JVBERi0xLj</code>?</p>

<p>I try response.message , response["message"]. But nothing works.</p>