Cardano-cli transaction submit error

Hmm, yes, then writing it as a nodejs application might be closer to what you are comfortable with:

All of that would be more elegant than calling out to the shell to cardano-cli in my opinion.

Unfortunately I cannot run my own node due to my current pc setup, so if there is anywhere I can “rent” a nde so to speak then I am all for that. Thank you for the links, I will be sure to have a look at them.

Additionally, I would not run a node on a local PC if you really want to provide NFT minting and stuff, but run it on some (virtual) server somewhere.

You already found demeter.run. Don’t know if that is supposed to be also for production deployment. As said, Blockfrost is an API with paid tiers, where you can query and submit to the blockchain. There were/are others, but at the moment I don’t have links at hand.