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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.
I have an example app, and have written documentation based on it, and I'd appreciate it if you could look and give some feedback. Yes, the doc is about ORM, but imagine the ORM is just an implementation detail and instead look at how validations, controllers, repos, and especially tests are done. Source code, and long boring tutorial about it. Really, check the tests here, they are special. It doesn't have "service" because the app is too simple, but I usually have a service layer as a files with exported functions. Error handling is in app.ts.