Backend EngineeringAugust 20, 20261 min read

Designing Reliable Backend APIs

Best practices for engineering type-safe RESTful backend services with strict validation, centralized error handling, and OpenAPI documentation.

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Backend APIs serve as the foundation of modern web applications. Building APIs that are predictable, performant, and secure requires strict adherence to software design principles and validation standards.

Best Practices for API Reliability

Strict Schema Validation: Utilize libraries like Zod or Pydantic to validate every incoming HTTP payload before business logic execution.
Unified Error Handling: Create standardized error response factories (`AppError`) to eliminate uncaught exceptions and provide consistent client feedback.
Automated OpenAPI Specs: Keep Swagger/OpenAPI documentation synchronized with backend controller definitions.

By establishing clean contract-driven development, frontend and backend teams can integrate features faster and with greater confidence.