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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.
The formState object stores all our form state while the setFormState method mutates the state whenever a change happens in a field. (You may want to look at the code for the completed vanilla form in this repo on GitHub).
React Hook Form is one of the most popular libraries for building forms in React apps with over 39k stars on GitHub. The library has no external dependencies according to Bundle Phobia.
On the other hand, Formik gives you components that you can mix and match to have fully working forms. Formik has builtin support for Yup for data validation.