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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.
VSCode has advanced beyond my most optimistic expectations, and it's extensions development support is likely the most attractive part of VSCode "user experience". So, I find very surprising that the very first example fails to start the Extension Development Host (as a result of pushing the F5 button). The only article I found that "almost explains it" is this created by Ben Awad (see this repository - but even Ben who felt capable of resolving this mystery tripped several times in his narration, so I remain confused about that is the problem.