Building Scalable Node.js APIs

Scalable APIs depend on clear boundaries between domain logic, transport, and data access. Teams that avoid tight coupling can evolve faster as load grows.

Core Design Practices

• Use layered architecture and explicit service contracts.
• Apply schema validation at API edges.
• Keep business rules isolated from framework code.

Scale and Reliability

• Introduce caching for heavy read patterns.
• Add circuit breakers and request timeouts.
• Use queue-based async workflows for expensive jobs.