Express Middleware Patterns

About

Provides a comprehensive set of middleware implementation patterns for Express.js applications, covering critical backend concerns such as JWT authentication, Zod-based input validation, centralized error handling, and Redis-backed rate limiting. It helps developers build robust, secure, and observable Node.js APIs by establishing standardized request-response lifecycles and protecting endpoints against common vulnerabilities, ensuring consistent behavior across the entire backend architecture.

Key Features

• JWT-based authentication and role-based authorization patterns
• Structured request logging and observability using Pino and unique request IDs
• Redis-backed rate limiting for API protection and brute-force prevention
• Schema-driven input validation using Zod for bodies, queries, and params
• Centralized error handling with custom error classes and async wrappers
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Use Cases

• Securing REST API endpoints with token-based authentication and granular permissions
• Standardizing error responses and logging across a large-scale Express application
• Protecting backend services from high traffic and abuse via rate limiting