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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've used Express, Fastify, and NestJS for the most part. I almost exclusively work with NestJS now, as you can imagine. The fact that it has an opinionated structure for how to architect your application is something that drew me in to begin with. With almost every Nest application I can pick it up, scan the structure, and have a good idea of what's going to be happening at a very high level. It also has defined classes with specific roles. A guard will always be used for authentication, a pipe will always be for transformation and validation of request information, a filter will always be for error handling. The only one that doesn't have a "this is always for that" is an interceptor, which is pretty much your middleware of the Nest world. Logging, caching, response mapping, it can do it all. There's also using Nest for more than just web servers, as there's nest-commander (one of my packages) for CLI applications, and there's discord bot packages for Nest as well.
Optionally you can bring in the Controller, which makes it a tad more opinionated (1 controller per route, class methods are HTTP methods, which imho works really well for REST).