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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.
There are a couple of "single file" solutions in existence, but they have incredibly specific use cases...Like the EPUB format, and the TiddlyWiki project. At the end of the day, it likely just boils down to "There's no demand nor foreseeable need for such a format." Sure, use cases could be contrived and built towards, but it's a solution looking for a problem at the moment.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.