error-handling-backend-python

Global exception handling in FastAPI is achieved by registering centralized exception handlers that intercept domain exceptions and return standardized JSON error envelopes. This Skill provides typed exception classes and automatic ApiResponse formatting.

Consistent FastAPI error responses require a typed exception hierarchy mapped to global handlers. This framework provides NotFoundException, ValidationException, and BusinessRuleException classes that automatically generate safe, structured JSON error envelopes.

Structured logging for FastAPI API errors integrates with structlog to produce correlated traces across requests. The framework pairs global exception handlers with correlation ID middleware to ensure every logged error contains contextual request identifiers.

Retry logic for external calls in FastAPI is supported through optional tenacity integration. The framework allows you to apply resilient retry patterns to outbound requests while automatically mapping exhausted retries to domain exceptions.

Correlation ID support in FastAPI is included via middleware that propagates identifiers across requests. The framework automatically injects these correlation IDs into structlog entries and API error responses for distributed tracing.

FastAPI REST endpoint validation and authorization use a typed exception hierarchy including ValidationException, UnauthorizedException, and ForbiddenException. Global handlers intercept these to return consistent HTTP status codes and JSON error envelopes.