Expressjs Development

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 middleware-based request processing pipelines
• Developing authentication and authorization systems
• Implementing file upload and download services
• Building webhook handlers and integrations
• Creating serverless functions with Express

Core Concepts

Application Setup

Express applications are built by creating an instance of Express and configuring middleware and routes.

Basic Express Application:

const express = require('express');
const app = express();

// Middleware
app.use(express.json());
app.use(express.urlencoded({ extended: true }));