This go library should help with parsing the IVAO Whazzup v2 API. You still have to get the JSON data by yourself and pass the content or filepath into the library.
The official documentation of the IVAO Whazzup v2 API can be found here https://wiki.ivao.aero/en/home/devops/api/documentation-v2#whazzup-v2-api-documentation.
Code examples can be found in the examples folder.