Basics of Node Js

NodeJs: Node.js is a runtime environment that allows us to run JavaScript outside the browser, mainly on the server side.Node.js allows JavaScript to run on servers. Used for: 1. Build backend/server applications APIs, Real-time apps (chat apps), REST services 2. High performance Uses V8 engine (very fast), Non-blocking I/O 3. Real-time applications Chat applications, Live notifications, Streaming apps 4. Full-stack JavaScript Same language (JavaScript) for frontend and backend Key Differences Feature Node.js Browser JavaScript Runs On Server Browser Access to File system, OS, network DOM, window, document Module System CommonJS / ES Modules ES Modules Global Object global window Use Case Backend development Frontend UI development 1. Environment Browser JS runs inside Chrome, Firefox, etc. Node.js runs on server machines. 2. APIs Browser has DOM APIs (document, window) Node.js has file system (fs), HTTP module, etc. 3. Security Browser JS is sandboxed. Node.js has full system access.