This morning, I ran across node-confme, yet another configuration package, for use with Node.js.

I don’t know if it’s useful or workable for browsers; I don’t do client-side development.

The main takeaway here is that it can validate a structure (using LIVR) and allows environment variable substitution for values. It’s (probably) not the first configuration library to do this, nor will it be the last, and it may not be the best - this is not an endorsement or recommendation - but it seems workable.

The biggest problems with it are the English translation (for which a pull request exists), and the lack of an explicit test suite (also part of a PR now).