Why is deep nesting a problem in Express?
URLs get long and rigid (/users/:userId/posts/:postId/comments/:commentId). Hard to refactor. Use a separate top-level router with a filter (?post=postId) for deeper resources. Keeps URLs clean and flexible.
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More FAQs in Common Express Router Mistakes (and How to Avoid Them)
Routes in wrong order, wrong mount path, router not mounted, forgetting auth, public routes inside auth router, deep nesting, mounting the same router twice, logic in routes, no validation, and sync handlers without asyncHandler.
Because /:id was declared before /me. /:id matches any string, including 'me'. Fix: declare /me before /:id, or use a different path like /me/profile.
Either the router was not mounted in app.js (app.use('/path', router)), or the mount path is wrong. Check that you mount every router with the right prefix.
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