Json View
https://chrome.google.com/webstore/detail/jsonview/chklaanhfefbnpoihckbnefhakgolnmc
Advanced Rest Client (gmail 계정 로그인 필요)
https://chrome.google.com/webstore/detail/advanced-rest-client/hgmloofddffdnphfgcellkdfbfbjeloo
(비슷한 확장프로그램 POSTMAN REST Client 도 괜춤)
