Why add circuit breakers in microservices?
Network calls fail. A service going down should not cascade. Circuit breakers (e.g., opossum) stop calling a failing service so it can recover, and retries with backoff handle transient failures.
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More FAQs in Node.js Microservices Roadmap: Step by Step
Build a clean monolith. Routes, controllers, models, services, middlewares, utils. Keep modules decoupled and structure data per module. This is your foundation for splitting later.
A gateway (Nginx, Kong, or a custom Express app) sits in front of your services and routes requests to the right one. The client does not see the split. You need one once you have more than one service.
A single request can hit multiple services. Without distributed tracing (Jaeger, Zipkin), you cannot see where time is spent or where errors come from. You cannot debug what you cannot see.
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