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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.
For ASP.NET Core users alike, the System.IdentityModel.Tokens.Jwt package should be sufficient enough to achieve similar results if not the very same. I'd love to provide an example here but I don't think I have a fitting one as I'm still a bit fuzzy on the platform. I do however have a .NET Core public repo with a working jwt example which can be modified to fit this use case for the hopeless looking for a starting point.
I used carbon.now.sh for the cover image and I used umletino for the diagram.