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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.
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SSEs come dangerously close to working for serverless, and I completed an entire proof-of-concept chat application in NextJS that was working swimmingly in local development. The only problem: it relied on keeping an array of client objects in memory. One dangerous thing about serverless functions is that this will work some of the time. Because sometimes serverless functions are run on the same computer when they're executed, but that's not a guarantee. Serverless functions are ephemeral by design, so in-memory storage won't scale once deployed.
Integrating with Ably was (relatively) painless, though I want to go on record and recommend avoiding their react hooks package, which I found tripped me up more than it helped, especially as it had an outstanding bug at the time of writing that affected me. But the good news is that using Ably's standard client in React isn't that tricky.
I've stripped off any Tailwind classes or styling of any kind in an attempt to keep this as simple as possible.