--- title: "Sonu Kumar (@shavik06212) | Hashnode" description: "Sonu Kumar (@shavik06212) writes on Hashnode. Read their latest articles and follow their work." url: "https://hashnode.com/@shavik06212" --- @shavik06212 # Sonu Kumar @shavik06212 · Joined October 2024 ### [Node.js Module System](https://node-module.hashnode.dev/nodejs-module-system?utm_source=hashnode&utm_medium=feed) Node.js has two module systems: CommonJS Modules: ECMAScript Modules (ESM): CommonJS Modules: This is the traditional module system in Node.js. Files with .cjs extension are treated as CommonJS modules. Files with .js extension are treated as ... 2 min read · [node-module.hashnode.dev](https://node-module.hashnode.dev/nodejs-module-system?utm_source=hashnode&utm_medium=feed) [Nov 25, 2024](https://hashnode.com/posts/nodejs-module-system/6743d6b47fc06fd2a0b7ca1e) ### [Why there is no WIndow or Document in the Node.js](https://repl.hashnode.dev/why-there-is-no-window-or-document-in-the-nodejs?utm_source=hashnode&utm_medium=feed) In Node.js, there is no window or document object because Node.js operates in a server-side environment, not a browser environment. Here's why these objects are absent: Browser-Specific Objects: The window object represents the browser window and pr... 2 min read · [repl.hashnode.dev](https://repl.hashnode.dev/why-there-is-no-window-or-document-in-the-nodejs?utm_source=hashnode&utm_medium=feed) [Nov 24, 2024](https://hashnode.com/posts/why-there-is-no-window-or-document-in-the-nodejs/67428409ad8c84563cac59a5) ### [REPL in Node](https://repl.hashnode.dev/repl-in-node?utm_source=hashnode&utm_medium=feed) REPL, which stand for Read Eval Print Loop, is an interactive programming enviroment that allows you to execute Javascript code in the real time time . 1 min read · [repl.hashnode.dev](https://repl.hashnode.dev/repl-in-node?utm_source=hashnode&utm_medium=feed) [Nov 22, 2024](https://hashnode.com/posts/repl-in-node/673fdefebc02f6de05c8538d) ### [JWT (JSON Web Token )](https://jsonwebtoken.hashnode.dev/jwt-json-web-token?utm_source=hashnode&utm_medium=feed) Learn about JWT, a compact token for secure, verifiable data exchange, used in web authentication to maintain efficient, scalable session management 3 min read · [jsonwebtoken.hashnode.dev](https://jsonwebtoken.hashnode.dev/jwt-json-web-token?utm_source=hashnode&utm_medium=feed) [Oct 21, 2024](https://hashnode.com/posts/jwt-json-web-token/67167898e3bf7012cc1666f6)