Express Middleware Patterns

Express middleware provides powerful request processing. Here's how to use and create middleware effectively.

Best Practices#

Organization:
✓ Keep middleware focused
✓ Use middleware factories
✓ Order middleware correctly
✓ Handle async errors

Performance:
✓ Keep middleware lightweight
✓ Cache when appropriate
✓ Avoid blocking operations
✓ Use streaming for large responses

Security:
✓ Validate all inputs
✓ Use helmet for headers
✓ Implement rate limiting
✓ Log security events

Express middleware enables clean, modular request processing. Use factories for configurable middleware, async handlers for error propagation, and proper ordering for correct execution. Well-designed middleware keeps route handlers focused on business logic.

Express Middleware Patterns

Middleware Basics#

Request Processing Chain#

Authentication Middleware#

Validation Middleware#

Error Handling Middleware#

Request Logging#

Caching Middleware#

Composition Patterns#

Best Practices#

Conclusion#

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