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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 can notice in examples that author loves to use globals, holds all logic in the controller (api function) so I wouldn't trust to such author
Tons of opinions in internet and here on r/nore each second topic is about such recommendations. node best practices is a good place to start, in general approaches are up to developer opinion: I prefer simple functions, many others prefer nest.js with OOP practices, metarhia author prefers over engineering and using globals, and everyone is right on its own