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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I made a demo of a peer to peer style game with VueJS (but it is vue2 sorry, cos I did it a while ago) https://github.com/ably-labs/depict-it It is open source, please take it if it is helpful! It uses Ably to do the websockets, which does the client/server communication with pub/sub. They have a pretty generous free account offering. There's a pretty thorough readme in the repo and I talk through it in this vid if you prefer: https://www.youtube.com/watch?v=mE7cgvcuZig
Thanks a bunch, we've already found your stuff actually! Tt made us question our initial decision to go purely socket.io. So, I think your project is a great base to learn with !