title: How can modify request.data in django REST framework
body: <p>I am using Django REST Framework</p>
  
  <pre><code>request.data = '{"id": "10", "user": "tom"}'
  </code></pre>
  
  <p>I want to add extra attribute like <code>"age": "30"</code> before sending it to further like</p>
  
  <pre><code>    request.data = new_data
      response = super().post(request, *args, **kwargs)
  </code></pre>
  
  <p>I have two issues</p>
  
  <ol>
  <li>Why request.data is coming as string rather than dict</li>
  <li>How can i update the request.data</li>
  </ol>