How do you mount a router in Express?
Use app.use('/path', router). The router's paths are then relative to the mount path. For example, router.get('/:id') mounted at /users responds to /users/:id.
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More FAQs in Express Router: Grouping and Mounting Explained
For grouping routes by feature in separate files. You create a router in routes/users.js, add routes to it, and mount it in app.js with app.use('/users', usersRouter). This keeps app.js clean as features grow.
Yes. Use 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.
Yes. You can mount one router inside another: router.use('/:userId/posts', postsRouter). Now /users/:userId/posts/... hits postsRouter. Useful for nested resources.
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