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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.
General recommendation is to start at chapter 1 and read everything. Anime skipped a bunch of chapters and reordered a bunch. Also shaved a couple of scenes and lines here and there. Nothing too important, but there's good stuff in there and some of it will get callbacks later. Reading everything will help put those 'new' chapters in context, but if that's too much to ask (understandable!), guya.moe also offers a nice overview of adapted/unadapted chapters. Highly recommended to read at least those.