API for json-c is available in ATS (announcement)

Google Group
1

For the entire package:

https://github.com/githwxi/ATS-Postiats/tree/master/contrib/json-c/

For documentation:

http://www.ats-lang.org/LIBRARY/contrib/json-c/json.html

For some short examples and a Makefile:

https://github.com/githwxi/ATS-Postiats/tree/master/contrib/json-c/TEST

Hopefully, this package serves as good example for people interested in
writing API in ATS for external libraries.

Cheers!