It worked very well for me in my chess-puzzle cashu faucet
I hacked it together in a few hours for a the Ecash Hackday this week, and it just worked immediately.
I must admit that I didn't do anything complex with it, so I can't offer any useful feedback. I just want to thank you for it 😀
https://github.com/aaronmcdaid/chessu/blob/main/server/server.js#L5