NodeJS
Aman Kumar
Created at: July 31, 2026 at 07:04 AM
## Node.js Overview Node.js is a open-source, cross-platform JavaScript runtime environment. It executes JavaScript code outside a web browser, typically on a server. [1, 2, 3, 4] ## Core Features * V8 Engine: Built on Google Chrome's fast JavaScript engine. * Asynchronous: Code runs without blocking execution threads. * Event-Driven: Uses an event loop to handle concurrent operations efficiently. * Single-Threaded: Scales easily using a single main thread. * NPM Ecosystem: Access to millions of reusable open-source packages. [5, 6, 7, 8, 9] ## Architecture & Workflow [ Client Request ] │ ▼ [ Event Queue ] ──> [ Event Loop ] ──> [ Thread Pool (Heavy Tasks) ] │ ▼ [ Callback Executed ] ## Common Use Cases * REST APIs: Building backend services for web and mobile apps. * Real-Time Apps: Chat applications and live streaming platforms. * Microservices: Creating small, independent, and scalable services. * Tooling: Powering command-line tools and frontend build scripts. [10, 11, 12, 13, 14] ## Basic Example (HTTP Server) const http = require('http'); const server = http.createServer((req, res) => { res.writeHead(200, { 'Content-Type': 'text/plain' }); res.end('Hello, Node.js!'); }); server.listen(3000, () => console.log('Server running on port 3000'));