title: django REST framework, validate json data
body: <p>The server comes with json format:</p>
  
  <pre><code>{
      "type": "string",
      "object": {
          "lead_id": int,
          "form_name": "string",
          "answers": [
              {
                  "lead_id": int,
                  "key": "string",
              }
              ...
          ]
      },
      "group_id": int,
      "secret": "string"
  }
  </code></pre>
  
  <p>How to use django REST framework to validate this json?</p>
  
  <p><a href="https://ru.stackoverflow.com/questions/877256/django-rest-framework-%D0%B2%D0%B0%D0%BB%D0%B8%D0%B4%D0%B0%D1%86%D0%B8%D1%8F-json-%D0%B4%D0%B0%D0%BD%D0%BD%D1%8B%D1%85">ru</a> version </p>