Node.js NestJS Backend Microservices

Use When

• Building or extending Node.js and NestJS services
• Adding new API endpoints, async consumers, or domain workflows
• Improving service reliability, observability, or deployment safety

Workflow

1. Define bounded context and service ownership, including dependencies.
2. Define API or event contracts before implementation.
3. Implement business logic in domain-focused modules, not controllers.
4. Add validation, authn and authz hooks, idempotency, and error mapping.
5. Add telemetry (structured logs, metrics, traces) with correlation IDs.
6. Verify with unit, integration, contract, and failure-mode tests.

Runtime Guardrails