title: Validating JSON data
body: <p>I am using json in some AJAX request and am currently manually validating each entry using (if "key" in json.some_location.keys()) over and over again.</p>
  
  <p>Is there a simpler way to do this (like XML validation)?</p>
  
  <p>Note: I am open to validation libraries, but would like something I can drop into django itself (not python eggs).</p>