INTRO
Without limits, login, search, and webhook endpoints become involuntary DDoS sinks. Rate limiting is not perfect - IPs rotate - but it cuts noise and slows credential stuffing. I combine IP limits with stricter user-based limits for authenticated routes.
Choose the limit key carefully
Anonymous: IP + route + window. Authenticated: user id wins over IP for fairness behind NAT.
Return `429` with `Retry-After` when possible; log threshold breaches.
Redis when you run multiple instances
In-memory `Map` counters reset per instance and skew under load. Redis (or a managed equivalent) centralizes counts with TTL.
Sliding window vs fixed window: fixed is simpler; sliding reduces burst edge effects slightly - pick based on abuse you see.
KEY TAKEAWAYS
“Rate limit expensive endpoints: auth, search, file upload.”
- 02
Use user id when authenticated; IP alone is coarse.
- 03
Share counters with Redis beyond one Node process.
CONCLUSION
Closing thought
Rate limiting is baseline hygiene. Start simple, tune keys from real traffic, and centralize when you scale out. Ready to talk scope? Use Contact — or browse Services for fit.
CONTINUE
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