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Middleware is the core of web frameworks. It handles tasks across your whole app. It makes your code secure and easy to manage.
Middleware wraps your handler functions. Requests flow through a pipeline. The order of this pipeline matters.
- Place logging first.
- Place authentication second.
- Place rate limiting third.
Key patterns to use:
- Authentication: Check user credentials. Return 401 for errors.
- Logging: Track request path and duration. Use a unique request ID.
- Rate Limiting: Stop too many requests. Return 429. Use Redis for speed.
- Validation: Check data before it hits your logic. Use tools like Zod.
- Error Handling: Return clean messages. Hide stack traces in production.
Avoid common mistakes:
- Do not over-engineer for scale you do not have.
- Build the happy path first.
- Measure performance before you optimize.
- Do not ignore backpressure. Use timeouts and circuit breakers.
Operable systems need three things:
- Structured logs with trace IDs.
- RED metrics (Rate, Errors, Duration).
- Distributed tracing.
Pro tips for stability:
- Use idempotency keys to stop duplicate requests.
- Use database transactions for multi-record updates.
- Design APIs to give the client all data for one screen.
Your action plan:
- This week: Audit your error handling and observability.
- This month: Try one new pattern like a message queue.
- This quarter: Automate your deployments and monitoring.