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Express.js

1. Express.js Basics​

  • Introduction to Express.js
  • Setting up an Express server
  • Understanding middleware
  • Basic routing (GET, POST, PUT, DELETE)
  • Serving static files

2. Routing​

  • Defining routes with app.get(), app.post(), etc.
  • Route parameters and query strings
  • Grouping routes using Router
  • Handling 404 and other errors with custom routes

3. Middleware​

  • Built-in middleware (express.json(), express.urlencoded())
  • Third-party middleware (e.g., morgan, cors, helmet)
  • Custom middleware
  • Middleware execution order

4. Request and Response Handling​

  • Accessing request data:
    • req.body, req.params, req.query, req.headers
  • Sending responses:
    • res.send(), res.json(), res.status()
  • Redirecting requests with res.redirect()
  • Setting headers with res.set()

5. Template Engines (Optional)​

  • Integrating template engines like EJS, Pug, or Handlebars
  • Rendering HTML templates with dynamic data

6. Handling Form Data​

  • Parsing JSON and URL-encoded form data
  • Handling file uploads using multer

7. RESTful API Development​

  • Designing RESTful endpoints
  • CRUD operations with Express
  • Using HTTP status codes effectively
  • Structuring routes for scalability

8. Error Handling​

  • Creating error-handling middleware
  • Catching and responding to errors