Node.js Cheatsheet
Overview
- Node.js is an open-source, cross-platform JavaScript runtime environment.
- It is often used for server-side web development, command-line tools, and desktop applications.
- Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient.
Installation
- Download the Node.js installer from the Node.js website.
- Run the installer and follow the prompts to install Node.js.
Basic Usage
- Create a new Node.js file with the
.js file extension.
- Write JavaScript code in the file to perform the desired task.
- Run the file using the
node command in the terminal.
Common Modules
- Node.js has a large number of built-in modules that provide useful functionality.
- Some common modules include
http, fs, path, and os.
- Modules can be imported using the
require function.
NPM
- NPM (Node Package Manager) is a package manager for Node.js.
- It allows you to easily install and manage third-party packages.
- NPM packages can be installed using the
npm install command.
Example
// Example Node.js file
const http = require('http');
const server = http.createServer((req, res) => {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/plain');
res.end('Hello, world!');
});
server.listen(3000, () => {
console.log('Server running on port 3000');
});
This Node.js file creates a simple HTTP server that listens on port 3000 and responds with the message “Hello, world!”.
Resources