Building RESTful APIs with Node.js and Express.js

1. Setting Up Express.js for API Development:

• Use Express.js to create a server for handling API requests.
• Utilize middleware for parsing JSON and handling CORS.

// Example: Setting Up Express.js for API
const express = require('express');
const app = express();
const port = 3000;

app.use(express.json());
app.use(cors());

app.get('/api/greet', (req, res) => {
    res.json({ message: 'Hello, API!' });
});

app.listen(port, () => {
    console.log(`API server listening at http://localhost:${port}`);
});

2. RESTful Routing in Express.js:

• Follow RESTful conventions for route structure (GET, POST, PUT, DELETE).
• Use meaningful route names and HTTP methods.

// Example: RESTful Routing in Express.js
// GET all items
app.get('/api/items', (req, res) => {
    // Retrieve all items
});

// GET a specific item
app.get('/api/items/:id', (req, res) => {
    // Retrieve item with given ID
});

// POST a new item
app.post('/api/items', (req, res) => {
    // Create a new item
});

// PUT update an item
app.put('/api/items/:id', (req, res) => {
    // Update item with given ID
});

// DELETE an item
app.delete('/api/items/:id', (req, res) => {
    // Delete item with given ID
});

3. Handling Authentication and Authorization:

• Secure API endpoints using authentication middleware.
• Implement authorization to control access to specific routes.

// Example: Securing API Endpoints with Passport.js
app.get('/api/secure', passport.authenticate('local'), (req, res) => {
    // Access granted for authenticated users
});

Q: Why is building RESTful APIs important in modern web development?
A: RESTful APIs provide a standardized way for different applications to communicate over the web, enabling the development of scalable and interoperable web services.

Q: How do you handle routing in an Express.js API following RESTful conventions?
A: Follow RESTful conventions by using meaningful route names and HTTP methods (GET, POST, PUT, DELETE) for CRUD operations on resources.

Q: Why is authentication important in API development, and how can it be implemented in Express.js?
A: Authentication in API development is crucial for ensuring that only authorized users can access protected resources. In Express.js, authentication can be implemented using middleware, with tools like Passport.js.

Building RESTful APIs with Node.js tutorial
RESTful API development best practices
Setting up Express.js for API projects
Express.js middleware for API development
RESTful routing in Express.js

Handling authentication in Node.js APIs
Securing API endpoints with Passport.js
Express.js authorization for API routes
Best practices for building scalable APIs
Node.js API development guidelines

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