How can I get only json data as response from ANSIBLE REST APIS

When I hit my Ansible REST API from REST Client, I get whole HTML document back.
All I am interested in is the json data which should come back as response.

Could you please help and let me know if there is any configuration or header which will get me only json data in REST CLIENT?

Ansible does not have a REST API, Tower does, for Tower support please go to http://support.ansible.com