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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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turbo
The speed of a single-page web application without having to write any JavaScript (by hotwired)
I think the Solid project [1] with Inrupt's auth library[2] that supports PKCE with dpop tokens works well with the new browser restrictions.
[1] https://solidproject.org/
It's still a thing: https://turbo.hotwire.dev/
HTML fragments are not all that less efficient than JSON.
I think you're referring to TurboLinks. TurboLinks is still around. Building on that technology and moving towards HTML over socket is https://hotwire.dev/