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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've pumped out many web apps using Svelte(Kit). I find it very good for rapid prototyping and exploratory programming. For example, I wrote a beat-aware video player in an afternoon or two.
Even if you are a single dev, you will probably find yourself interacting with other members of the community. (Maybe more so for a single dev?) I find the Svelte community quite responsive and helpful.
SvelteKit can handle both client and server parts. It streamlines a lot of the stuff most web apps need like routing. However, it doesn't include some other common stuff like auth and persistence to a database.
https://kit.svelte.dev/