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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.
Highly recommend to not use a library (like socket.io) that requires you to use a specific client/server. I've found that the browser WebSocket class is more than sufficient in most cases and very easy to use. And similarly, a server-side library like ws (if you have a Node.js server) is similarly easy to use. The logic of this is that websockets are very similar to TCP sockets which is the standard for native clients (non-web) and using a lower-level library will make it far easier to switch out technologies, languages, and network protocols if necessary.