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In this tutorial, you'll learn: How to install and run Node.js Core concepts like modules and the event loop
Deploying Node.js applications What is Node.js?
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Node.js is a free, open - source JavaScript runtime that runs on Windows, Mac, Linux, and more.
It lets you execute JavaScript code outside of a web browser, enabling server - side development with JavaScript.Built on Chrome's V8 JavaScript engine, Node.js is designed for building scalable network applications efficiently.
Example: Print a Message console.log('Hello from Node.js!'); Why Node.js? Node.js excels at handling many simultaneous connections with minimal overhead, making it perfect for:
(chats, gaming, collaboration tools)
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Its non - blocking, event - driven architecture makes it highly efficient for I/O - heavy workloads.Node.js uses asynchronous
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(non - blocking) programming.This means it can keep working while waiting for tasks like reading files or talking to a database.
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With asynchronous code, Node.js can handle many things at once - making it fast and efficient.// Load the filesystem module const fs = require('fs');
// Read file asynchronously fs.readFile('myfile.txt', 'utf8', (err, data) => {
if (err) {
console.error('Error reading file: ' + err);
return;
}
console.log('File content: ' + data);
});
console.log('Reading file... (this runs first!)');Node.js continues to the next line while reading the file When the file is read, our callback function runs
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This non - blocking behavior lets Node.js handle many requests efficiently.What Can Node.js Do?
: Create fast, scalable network applications
: Read, write, and manage files on the server
: Work with databases like MongoDB, MySQL, and more
: Build RESTful services and GraphQL APIs
: Handle WebSockets for live applications
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: Create command - line applicationsExample: Simple Web Server const http = require('http');
http.createServer((req, res) => {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World!');
}).listen(8080);What is a Node.js File? Node.js files contain code that runs on the server. They usually have the.js extension and can be started with the node command. Node.js files run tasks when certain events happen (like a web request) They must be started on the server to have any effect
Example: Running a Node.js File node app.js Node.js Versions & LTS: Node.js releases a new major version every six months. For stability, use an LTS (Long Term Support) version for production projects.