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Express.js Learning Roadmap: From Basics to Advanced
1. Getting Started with Express.js
Introduction to Express.js: Understand why Express.js is used and how it simplifies Node.js applications.
Setup: Install Node.js and Express using npm. Create a basic Express server.
2. Core Concepts
Routing: Define routes using app.get(), app.post(), app.put(), and app.delete().
Middleware: Understand middleware functions and use built-in, third-party, and custom middleware.
Request and Response: Handle HTTP requests (req) and responses (res).
3. Templating Engines
Introduction: Learn about templating engines like EJS, Handlebars, or Pug.
Dynamic HTML: Render dynamic content using templates.
4. Working with RESTful APIs
Create APIs: Build RESTful APIs with Express.
Handle Query Parameters: Parse URL parameters and query strings.
Send JSON Responses: Format and send JSON data to clients.
5. Middleware and Error Handling
Middleware Basics: Use next() for request flow.
Error Handling: Implement custom error-handling middleware.
Logging: Use libraries like morgan for logging requests.
6. Database Integration
Connect to Databases: Integrate MongoDB (Mongoose), MySQL, or PostgreSQL.
Perform CRUD Operations: Build database-backed routes for Create, Read, Update, Delete operations.
7. Authentication and Authorization
Authentication: Implement user authentication using sessions, cookies, or JSON Web Tokens (JWT).
Authorization: Restrict routes to specific user roles.
8. File Uploads and Static Files
File Uploads: Use multer for handling file uploads.
Serve Static Files: Use express.static() to serve images, CSS, and JavaScript files.
9. Advanced Features
CORS: Enable Cross-Origin Resource Sharing for APIs.
Rate Limiting: Protect APIs from abuse using rate-limiting middleware.
Real-Time Features: Integrate with WebSockets for live data.
10. Testing and Debugging
Unit Testing: Test routes using supertest and Jest or Mocha.
Debugging: Use tools like node-inspect or debug library.
11. Deployment
Prepare for Deployment: Use environment variables and production-ready configurations.
Deployment Platforms: Deploy on Heroku, Vercel, or AWS Elastic Beanstalk.
Scaling: Optimize your app for performance and scalability.
12. Build Projects
Beginner: Build a to-do list API.
Intermediate: Develop a blog backend with user authentication.
Advanced: Create a real-time chat application using Express and WebSockets.
Deploy your projects to demonstrate your skills.
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