I made a CLI tool called kilojoule that is similar to jq. I addition to the normal suite of JSON manipulations, it also has support for a couple of other file formats and can call other shell commands.

https://github.com/stevenlandis/kilojoule

I’ve found it to be a pleasant multi tool for interacting with the shell when I need something a little more than bash.

It took a couple of weekends and evenings to get working but was a really fun way to learn about parsers, interpreters and Rust.