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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.
Aside from the basic documentation on their website, I would also recommend reading through their kitchen sink examples. They're available on Github and on their site's documentation. I highly recommend reading the provided documentation top to bottom to really understand what the framework can provide and the testing philosophy the Cypress team took when building it. In addition, the Examples section on the Cypress website compiles a healthy amount of tutorial videos which have a ton of helpful information.