Express.js Development Skill This skill provides comprehensive guidance for building production-ready web applications and REST APIs using Express.js, covering routing, middleware, request/response handling, error handling, authentication, validation, and deployment best practices. When to Use This Skill Use this skill when: - Building RESTful APIs for web and mobile applications - Creating backend services and microservices - Developing web servers with server-side rendering - Implementing API gateways and proxy servers - Building real-time applications with WebSocket support - Creating midd…