FastAPI Error Handling: Types, Methods, and Best Practices

FastAPI provides multiple error handling mechanisms including built-in HTTP exceptions, custom exception classes, and exception handlers. Common error types include internal server errors (500), method not allowed (405), validation errors (422), and custom HTTP exceptions. Developers can handle errors using try-except blocks, custom exception handlers with the @app.exception_handler decorator, and global exception handlers. Best practices include using HTTPException for manual exceptions, JSONResponse in handlers, custom exception classes for business logic, implementing global handlers, standardizing error response formats, customizing validation errors, and mapping internal errors to safe public messages.