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.
surveyjs.io
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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.
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Supabase[1] is a popular, open-source[2], and very modern alternative with a great free tier!
[1] https://supabase.com/
There is https://github.com/typicode/json-server that is really useful for that matter
We do this at https://endoflife.date API, and it works quite well.
NOTE:
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Hence, a higher number means a more popular project.