Debugging Auth System Issues in HireNova

While building my project HireNova (Job Portal), I ran into 2 serious bugs that almost broke my authentication system. This project uses JWT + HTTP-only cookies for secure authentication — and that’s where things got interesting 1. Infinite API Loop (Production-level issue) After implementing persistent login using /api/auth/me, I noticed something strange… Every time I refreshed the page, the API was getting called again and again. Server logs looked like this: GET /api/auth/me 401 (repeating...) Root cause: I was calling loadUser() inside useEffect with isAuthenticated as dependency. So the flow became: API call → state update → dependency change → API call again 🔁 Result: • Infinite loop • Server spam • Performance issue Fix: Called loadUser() only once on app mount instead of depending on auth state. 2. Circular Dependency (Redux + Axios) While implementing auto logout on token expiry, I tried to dispatch logout inside Axios interceptor. Problem flow: Axios → Redux Store → Auth Slice → Axios Error: "Cannot access before initialization" Root cause: Tight coupling between Axios and Redux store Fix (Clean Architecture approach): Instead of directly dispatching: window.dispatchEvent(new Event("logout")); Handled logout globally inside App component. ✔ Decoupled architecture ✔ No circular dependency ✔ Scalable solution Key Learnings from this: • Infinite loops often come from wrong useEffect dependencies • Circular dependencies can silently break apps • Authentication is not just about login/logout — it's about system design • Real-world bugs teach more than tutorials Building HireNova taught me how production systems actually behave. If you're learning MERN, don’t just build features — debug real problems. Would love to know — have you faced similar issues while building auth systems? #MERN #React #NodeJS #WebDevelopment #FullStackDeveloper #JavaScript #LearningInPublic

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