title: ndb.key() -> do this with Javascript
body: <p>In my applicatoin I get keys that are constructed in a Python system, writing to Google Datastore.</p>
  
  <p>To match the data, I need the ID's of these items, and they are in the 'key' string.</p>
  
  <p>I cannot do key.id() since I do not have Python, I need to 'decode' it manually using JavaScript / Google Apps Script.</p>
  
  <p>Is this possible?</p>
  
  <pre><code>key = Key(urlsafe=url_string)
  kind_string = key.kind()
  ident = key.id()
  </code></pre>