Express Middleware Patterns

Master authentication, validation, error handling, rate limiting, and logging middleware.

When to Use This Skill

• Implementing authentication middleware (JWT, OAuth, sessions)
• Creating input validation middleware (Zod, Joi)
• Setting up error handling middleware
• Adding rate limiting to prevent abuse
• Implementing request/response logging
• Creating custom middleware for cross-cutting concerns
• Handling async errors in route handlers

Authentication Middleware