Can I mix app-level routing and Express Router?
Yes, but it gets messy. Pick one approach. If you have more than a few routes, use Router for all of them. Mixing makes the codebase inconsistent and harder to navigate.
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More FAQs in Express Router vs App-Level Routing: When to Use Each
When you have more than ~10 routes, multiple features (auth, users, posts), or multiple developers. App-level routing is fine for tiny apps and prototypes; switch to Router when the app grows.
Create a router per feature in routes/. Move routes into the router. Mount the router in app.js with app.use('/users', require('./routes/users')). Benefits: separation, per-router middlewares, cleaner app.js.
Separation of concerns (each feature has its own file), per-router middlewares (auth for a feature without repeating per route), cleaner app.js, team scalability (different devs work on different routers), and reusability (mount the same router under different paths).
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