📍 1. What is Routing in Express.js?
A: Routing defines how your application responds to client requests (GET, POST, etc.) to specific endpoints (URLs).
📍 2. Basic Route Syntax
app.get('/home', (req, res) => {
res.send('Welcome Home');
});📍3. Route Methods
-
app.get() – Read data -
app.post() – Create data -
app.put() – Update data -
app.delete() – Delete data 📍 4. Route Parameters
app.get('/user/:id', (req, res) => {
res.send(req.params.id);
});📍 5. Query Parameters
app.get('/search', (req, res) => {
res.send(req.query.keyword);
});📍 6. Route Chaining
app.route('/product')
.get(getHandler)
.post(postHandler)
.put(putHandler);📍 7. Router Middleware
const router = express.Router();
router.get('/about', (req, res) => res.send('About Page'));
app.use('/info', router); // URL: /info/about
📍 8. Error Handling Route
app.use((req, res) => {
res.status(404).send('Page Not Found');
});💡 Pro Tip: Always place dynamic routes after static ones to avoid conflicts.
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