solution

[Afengi110]

No description provided.

[mateacademy-ai-mentor]

Review Summary

Your implementation successfully meets all core requirements. The codebase correctly implements 2 collections (Users and Expenses) with 5 endpoints each, uses in-memory storage that resets on server restart, includes proper 404 error handling for missing entities, and properly exports the Express app from createServer() without calling app.listen(). The architecture with service/controller/router separation is well-organized. The validation gap mentioned in the general summary for the Expenses update endpoint is a design consideration rather than a critical blocker — many REST APIs intentionally support partial updates where only the fields being modified are required. The implementation is complete and functional.

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