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Node.js handles high traffic. Use profiling to find slow spots.
Stop using synchronous operations. Sync reads block your server. Use async APIs. Monitor event loop lag. Lag over 50ms means your loop is blocked.
Use the built-in profiler. Run with the prof flag. Use prof-process to read logs. Flame graphs show CPU use.
Find memory leaks with the inspect flag. Use Chrome DevTools. Take heap snapshots. Compare two snapshots to see leaked objects.
Tuning garbage collection reduces lag. Reuse objects. Stop creating too many objects in hot paths.
Use AsyncLocalStorage. This tracks requests across async calls. It makes debugging easier.
Test with realistic load. Use k6 or autocannon. Check requests per second and error rates.
Build simple systems first. Do not optimize for scale you lack. Measure first. Optimize later.
Invest in observability. You need three things:
- Structured logs with trace IDs
- RED metrics (Rate, Errors, Duration)
- Distributed tracing
Use OpenTelemetry for this.
Apply these patterns:
- Use idempotency keys to stop duplicate requests.
- Use database transactions for multiple record updates.
- Use health checks for liveness and readiness.
Audit your backend this week. Check your error handling and logs. Pick one area to improve.