As you've probably guessed by now, this project automatically converts JSON to Kotlin source files. The tool itself is implemented 100% in Kotlin, and makes heavy use of Square's excellent KotlinPoet library.
Read the blog post which covers how this multi-platform tool was written.
View the source on Github to grab the command line tool, or suggest improvements.
Get in touch on Twitter if you have questions, comments, or simply enjoy high-quality cat gifs.