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Asked by Vaibhav Last Modified
Answer Express.js is a web application framework for Node.js, designed to make it easier to build web applications and APIs. Here's a basic guide on how to use Express.js with Node.js:
Make sure you have Node.js and npm (Node Package Manager) installed on your machine. You can download them from the official website: Node.js Downloads.
Create a new directory for your project and navigate to it in the terminal. Run the following command to initialize a new Node.js project:
npm init -y This will create a package.json file with default values.
Install Express.js as a dependency for your project using the following command:
npm install express Create a new file (e.g., app.js) and set up a basic Express application:
const express = require('express'); const app = express(); const port = 3000; app.get('/', (req, res) => { res.send('Hello, Express!'); }); app.listen(port, () => { console.log(`Server listening at http://localhost:${port}`); }); In the terminal, run the following command to start your Express application:
node app.js Visit http://localhost:3000 in your web browser, and you should see the message "Hello, Express!"
Expand your application by adding more routes and handling different HTTP methods. For example:
// Define a route with parameters app.get('/users/:userId', (req, res) => { const userId = req.params.userId; res.send(`User ID: ${userId}`); }); // Handle POST requests app.post('/users', (req, res) => { res.send('User created!'); }); Express allows you to use middleware functions to perform additional tasks during the request-response cycle. For example, adding a middleware to log requests:
app.use((req, res, next) => { console.log(`Received a ${req.method} request to ${req.url}`); next(); }); These are the basic steps to get started with Express.js in a Node.js project. You can explore more features and advanced concepts in the Express.js documentation.
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