Routes in wrong order (wildcards first), middleware without next(), handler without response, wrong mount path, same path with different methods, async errors not caught, GET for non-idempotent actions, inconsistent status codes, no versioning, and all routes in app.js.
Probably a wildcard route is declared before them. Express matches in declaration order, so /users/* catches /users/me before /users/me can. Fix: declare specific routes before wildcards.
A middleware forgot to call next() or a handler forgot to send a response. Every middleware must call next() or respond; every handler must respond or pass to next(err). No orphans.
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.
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