Exception Handling Middleware

Overview

Handles all exceptions and converts them into consistent HTTP responses.

Prerequisites

• Custom exceptions must extend the base application exception

Implementation / Steps

1. Wrap the Lambda handler with middleware.
2. Catch known application exceptions.
3. Convert them into structured HTTP responses.
4. Catch unexpected errors and return a 500 response.

Key Takeaways

• Prevents unhandled runtime crashes.
• Ensures consistent error structure across endpoints.
• Separates error handling from business logic.