Frontend vs Backend Project Structure: MERN Stack

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Looks clean, but doesn't scale well. Grouping by technical layers (controllers/, models/, routes/) is a classic antipattern for anything beyond a pet project. Once you hit 15+ entities, every folder becomes a mess of files with no business context. Robert Martin put it simply in "Clean Architecture": your project structure should scream the business domain, not the framework. A modular approach (modules/user/, modules/order/) with a shared/ folder for infrastructure makes the project readable, maintainable, and ready to grow. Need to extract a module into a separate service? Just grab the folder. Same principle behind Hexagonal Architecture, Vertical Slices, Feature-Sliced Design — different names, one idea: organize code around the business, not around Express.js.

I've seen this graphic over 20 times. What's happening to you? Try it out for yourself. Search for "project structure" on LinkedIn. Why do you keep copying the same things without questioning them first?

Good for small apps Services/utils will be packed tightly on large app or evn when u try scaling small

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Work well for smaller apps. But its not scalable and maintainable I think. How about feature based structure?😀

Better understanding of project structure after seen your post

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