I present you a tool for generating different Json files - blockstates, block and item models, and recipes.
It can greatly speed up work of a modder or data/resource pack creator.
The documentation is sparse, but I plan to extend it if anyone can't figure out something.
This application requires Groovy 2.4+.
Extract contents of the archive to a dedicated folder, and use Run.sh to launch the generator.
Creator of Extended Item Information, Extra Features, Fine Technology.