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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 final code is here.
In combination with the awesome zod library we created a special constructor for strings with fixed length. It can be used both on the back end for incoming requests validation, but also on the front end for forms validation.
Back at my last job I was lucky enough to stumble upon some pretty awesome colleagues thanks to which I found even greater depths in Typescript which cemented the love even more. We used FP-TS to rewrite a legacy Feathers.js application and I learned many principles I later applied to my own full-stack "framework".