How do I avoid blocking the event loop in Node.js?
Offload heavy work to worker threads or background jobs. For long tasks, send a 202 Accepted and let the client poll for the result. Keep request handlers async and light.
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More FAQs in Common Architectural Mistakes in Node.js Projects
God modules, sharing databases across services, sync heavy work in request handlers, no API versioning, in-memory session state, tight coupling through direct imports, no schema validation, and console.log in production.
It couples services. If one service changes a schema, others break. Each service should own its data. If you need data from another service, use an API or event, not a direct query.
If you ship v1 without versioning and later need to change the response shape, every client breaks. Version from the start (/v1/users) and bump the version on breaking changes.
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