How do you handle public vs protected routes in an Express router?
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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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.
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.
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