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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.
Probably the most important thing is to have a normalized data cache to save yourself tons of data-bug headaches. I use https://resthooks.io/ myself because it used inferred typing safety meaning I don't have to do any extra definitions or even use typescript and it will tell me what types I should expect. But you could also roll your own normalization using https://github.com/paularmstrong/normalizr with a state management tool like redux
Probably the most important thing is to have a normalized data cache to save yourself tons of data-bug headaches. I use https://resthooks.io/ myself because it used inferred typing safety meaning I don't have to do any extra definitions or even use typescript and it will tell me what types I should expect. But you could also roll your own normalization using https://github.com/paularmstrong/normalizr with a state management tool like redux