expressjsHow can I create nested routes in Express.js?

Nested routes are routes that are nested within other routes in Express.js. This allows us to create a hierarchical structure for our routes. Here is an example of how to create nested routes in Express.js:

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

app.get('/', (req, res) => {
  res.send('Hello World!');
});

app.get('/users', (req, res) => {
  res.send('Users page');
});

app.get('/users/:userId', (req, res) => {
  res.send(`User ${req.params.userId}`);
});

app.listen(3000);

This example code will create 3 routes: /, /users and /users/:userId. The /users/:userId route is nested within the /users route. When a request is made for /users/:userId, the :userId parameter will be passed to the route handler.

Code explanation

• const express = require('express'); - This imports the Express.js module.
• const app = express(); - This creates an Express.js application.
• app.get('/', (req, res) => {...}); - This creates a route handler for the / route.
• app.get('/users', (req, res) => {...}); - This creates a route handler for the /users route.
• app.get('/users/:userId', (req, res) => {...}); - This creates a route handler for the /users/:userId route.
• res.send(User ${req.params.userId}); - This sends the userId parameter passed in the request back as a response.

Helpful links

• Express.js Documentation
• Creating Nested Routes in Express.js

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