[athorax]

I like CUE a lot. We use it pretty heavily for schema enforcement of CRDs. That being said, it is pretty complex and learning to use it was anything but straight forward.

For more basic configs, I would potentially look into KCL https://www.kcl-lang.io/

It has a much simpler usage overall especially if you are only really trying to enforce some config rules.

The other alternative is to just use whatever language you are writing your software in and build a basic validator