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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.
Example of the old days. A single React component in Adevinta Spain. With a bunch of files starting with a dot for config and its own Webpack configuration for creating a demo for it. Still available at https://github.com/SUI-Components/sui-autocompleted.
For this, we started creating a set of tools called SUI (Simple User Interface) to extract core functionality and tools for packages. We saw these tools like our AAAS (Architecture as a Software) and focused on following the Unix rules to make the tools as modular, independent and, replaceable as possible. We could change a whole tool always that the entry parameters and the output remained the same.
We also embraced other things: zero-config Javascript (#0CJS), to avoid dot points and config files in our projects and repositories; and Compatible Versioning to rely always on the major version, get the new features and fixes for free and be as less disruptive as possible. Both characteristics forced us to be very careful about our decisions but, after several years, I could say that it was a success.