The answer
Yes. Mount one router inside another: router.use('/:userId/posts', postsRouter). Now /users/:userId/posts/... hits postsRouter. Limit nesting to one level; for deeper resources, use a separate top-level router with a filter.
Express Router Interview Questions and Answers
Can Express routers be nested?
More FAQs in Express Router Interview Questions and Answers
A mini-app you can mount with app.use('/path', router). It lets you group routes by feature in separate files. Routers have their own middleware stack and can be nested.
router.use(middleware) at the top of the router file. Every route in the router now runs that middleware. Useful for auth and role checks across a feature without repeating per route.
Put public routes (signup, login) before router.use(auth). Then call router.use(auth) and put protected routes below. This keeps the structure clear and prevents accidental auth on public endpoints.
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