Node.js Internals: Single Thread, Event Loop, Non-Blocking I/O

Today’s class was all about Node.js Internals & Architecture. 🚀 Learned how JavaScript Engine + C++ + libuv = Node.js, and explored key concepts like Process, Event Loop, Thread Pool, Top-Level Code, Import Statements, and Event Callback Registration. Understanding how Node.js works behind the scenes is a great step toward writing better backend code. 💻 Chai Aur Code, Hitesh Choudhary Piyush Garg Akash Kadlag Jay Kadlag Anirudh J. #NodeJS #BackendDevelopment #JavaScript #CodingJourney

The Power of Asynchronous Programming in Node.js One of the most powerful features of Node.js is asynchronous programming. Unlike traditional blocking systems, Node.js can handle thousands of requests simultaneously. Example: Instead of waiting for a database query to finish, Node.js continues executing other tasks. This is possible because of: • Event loop • Non-blocking I/O • Promises and async/await The result? 🚀 Faster applications ⚡ Better scalability 💻 Efficient resource usage Understanding asynchronous programming is essential for writing efficient Node.js applications. If you're learning Node.js, mastering async/await and promises should be a priority. #NodeJS #AsyncProgramming #JavaScript #BackendDevelopment

If you truly understand the Event Loop, you understand how JavaScript really works under the hood. Here’s what every developer should know 👇 🧠 Main Thread → Executes synchronous code (Call Stack) 📦 Heap → Stores objects in memory 📋 Event Queue → Holds async callbacks waiting to run ⚙️ Thread Pool (libuv) → Handles heavy I/O tasks 🔁 Event Loop → Continuously checks the stack & queue #EventLoop #JavaScript #NodeJS #AsyncProgramming #BackendDevelopment #FullStackDeveloper #WebDevelopment #CodingInterview #ProgrammingConcepts #TechLearning

Most developers write try/catch in every single async function. There's a better way. I discovered the await-to-js pattern a while back, and it completely changed how I handle errors in Node.js and TypeScript. Instead of this mess: try { ... } catch(e) { console.log("error") } try { ... } catch(e) { console.log("error") } try { ... } catch(e) { console.log("error") } You write one tiny helper once, and every async call returns a clean [error, data] tuple. No nesting. No swallowed errors. No repeated boilerplate. The library is literally called await-to-js (npm). It has 3.5k stars. 400 bytes. Life-changing. If you're building any Node.js, Next.js, or backend API, add this to your utils file today. You'll wonder how you coded without it. 💬 Drop a comment if you use a different error handling pattern — always curious what others do. #JavaScript #NodeJS #CleanCode #WebDev #Programming #SoftwareEngineering #100DaysOfCode

🚀 𝐓𝐨𝐝𝐚𝐲 𝐈 𝐞𝐱𝐩𝐥𝐨𝐫𝐞𝐝 𝐚 𝐭𝐨𝐩𝐢𝐜 𝐭𝐡𝐚𝐭 𝐦𝐚𝐧𝐲 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫𝐬 𝐨𝐟𝐭𝐞𝐧 𝐨𝐯𝐞𝐫𝐥𝐨𝐨𝐤 ...(if you genuinely learn something new ......just comment down💬..... new) the difference between dependencies and devDependencies in package.json.( for c++, gcc compiler vs fancy IDE) understand the difference, we first need to understand package.json. package.json is the main configuration file of a JavaScript project built with React or Node.js. 📁 package.json. 📦 This file stores important information about the project such as project metadata, libraries used in the project, and commands required to run the application. Inside this file there are different sections, and one of them is dependencies. ✅ Dependencies Dependencies are the packages or libraries that are required for the application to run. For example, if you are building a project using React, the React package must be defined inside the dependencies section of the package.json file. Without these packages, the application cannot run properly. ✅ DevDependencies On the other hand, devDependencies are packages that are used only during development. They help developers write or check code but are not required to run the application in production. Examples include tools like: ESLint for checking errors Prettier for formatting code #120days #react #nodejs #js #developer

Node Internals🫡 Today we explored Node.js in depth and learned about its architecture and how it works internally. Nodejs==(V8 engine + livuv library + C++) Lifecycle of the Eventloop EventLoop TRUE{ expired callback(); IO polling(); setImmediate(); close callback(); } Thank you, Piyush Garg sir, for guiding us and teaching Node.js so clearly. #chaicode #javascript #nodejs #learning #learninpublic

🚀 Deep Dive into Node.js Internals I explored how Node.js actually works under the hood. Instead of just using APIs, I tried to understand the internal architecture and event loop mechanism that makes Node.js fast and non-blocking. 📚 Topics covered in my notes: Node.js Architecture V8 Engine and how JavaScript is executed Libuv and its role in asynchronous I/O Event Loop Phases Timers Pending Callbacks Polling (I/O) Check (setImmediate) Close Callbacks Difference between setTimeout() and setImmediate() Expired callbacks concept Thread Pool and background workers How callbacks move through the event loop To make the concepts easier to understand, I created structured visual notes and a complete PDF. 📄 Full Notes (Eraser workspace): https://lnkd.in/dQyBEFtE 📎 PDF attached in the post This deep dive helped me better understand why Node.js is single-threaded yet highly scalable. Special thanks to the amazing learning resources from #ChaiCode and Piyush Garg sir 🙌 #NodeJS #BackendDevelopment #JavaScript #EventLoop #SystemDesign #WebDevelopment #ChaiCode

📝 Two Number Sum With TypeScript The Two Number Sum DSA question is one of the most basic coding interview questions that most introductory software engineers will be asked to solve. I decided to code a viable solution to this question by using inline typing to define the functions and variables present. #JavaScript #TypeScript #WebDevelopment #Frontend  #SoftwareEngineering

Want to reuse code without rewriting the same logic again and again? That’s where inheritance in JavaScript classes becomes powerful. By extending a parent class, the child class automatically gets access to its properties and methods, making your code cleaner, structured, and scalable. This concept is heavily used in real-world applications to maintain modular architecture and reduce redundancy. Mastering OOP in JavaScript strengthens your foundation for React, Node, and full-stack development. Follow for more JavaScript concepts and practical coding projects. #JavaScript #WebDevelopment #ES6 #FullStackDeveloper