How do you handle logging in production?

Short answer: Use logging libraries like winston or pino for structured logs. Separate logs into levels (info, warn, error). Output logs to files or external services (Logstash, Datadog, Splunk). Implement log rotation to prevent disk space issues. Make logs easy to search and analyze.

Real-world example (ShopNest)

A ShopNest BFF in Node.js aggregates catalog and price APIs for the React storefront.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.