title: Array Key is not adding in node js
body: <p>hello I am new in node js. and i want to add a key with resultant array and print it in json array.</p>
  
  <pre><code>connection.modal.find( { 'id' : '2' }, function ( err, result ) {
      var response = {};
  
      result['add_key'] = 'abcdd';
      response['success'] = true;
      response['result'] = result;
      response['msg'] = 'Result fetched';
      res.json(response);
  });
  </code></pre>
  
  <p>It prints without <strong>add_key</strong></p>