fastapi-patterns

Standardize FastAPI middleware by applying curated ASGI and BaseHTTPMiddleware patterns to handle cross-cutting concerns predictably across routes. This ensures teams build APIs with consistent behavior rather than diverging implementations.

Manage dependency injection in FastAPI using modular DI factories and resource lifecycle management. This approach provides scalable APIs with clear testability through structured wiring of dependencies and testable resource handling.

Handle WebSocket authentication and errors in FastAPI using structured patterns for real-time endpoints. These patterns provide robust handling of authentication approaches and error management specifically designed for WebSocket connections.

Customize OpenAPI schemas and manage application lifespan in FastAPI using dedicated lifecycle hooks. These patterns ensure proper startup and graceful shutdown while customizing OpenAPI documentation to fit your API requirements.

Choose ASGI middleware versus BaseHTTPMiddleware in FastAPI based on your cross-cutting concern requirements. ASGI offers lower-level handling while BaseHTTPMiddleware provides simpler request and response manipulation for predictable route behavior.