Node.js Internals & Architecture Explained

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

Today's class pushed me a bit out of my comfort zone with Node.js — and that’s always a good sign of learning. Here’s what we explored today: • What Node.js really is (in depth) • How V8 + C++ + LibUV together power Node.js • Understanding the Event Loop • Expired callbacks, I/O tasks, and the async workflow We also received a great assignment: Record a video explaining how the Event Loop works and how the entire process runs behind the scenes. Really enjoyed the session by Piyush Garg , Akash Kadlag , and Anirudh J. #chaicode #nodejs #webdevcohort2026 #javascript #backenddevelopment

🚀 Node.js File Handling Made Simple (with Real Code + Architecture) Ever wondered how file operations actually work behind the scenes? Here’s the flow 👇 👨💻 Code → ⚙️ Event Loop → 🧵 Libuv → 💾 OS → 📂 File System 📖 Read → fs.readFile ✍️ Write → fs.writeFile ❌ Delete → fs.unlink 💡 Key Insight: Node.js uses non-blocking I/O, so your app never waits for file operations! 🔥 Pro Tip: Switch to async/await using fs.promises for cleaner and scalable code. #NodeJS #BackendDevelopment #JavaScript #SystemDesign #Coding #100DaysOfCode

Have you ever wondered what actually happens behind the scenes when you run 𝘯𝘰𝘥𝘦 𝘧𝘪𝘭𝘦𝘯𝘢𝘮𝘦.𝘫𝘴? I recently dived deep into Node.js internals as part of an assignment, and I’m excited to share two detailed blog posts that break it all down — from the core architecture to the exact execution flow. Blog 1: A Gentle Introduction to the Foundation of Node.js Architecture where I explained the three pillars that power everything: V8, LibUV, and the C++ Bindings. Read here: https://lnkd.in/gQcuwZMG Blog 2: Deep Dive into Node.js Architecture and Internal Workings This one walks you through, step by step, exactly what happens when you execute a JavaScript file with the node command. Read here: https://lnkd.in/gjqWb2sX I couldn’t get the video version ready on time (researching + writing these took priority, and my recording setup wasn’t prepared). But I will try to record + share the video! If you’re a developer who wants to truly understand what’s happening under the hood of Node.js, these are for you. Would love to hear your thoughts — have you explored V8 or LibUV before? Drop a comment below! Hitesh Choudhary Piyush Garg Akash Kadlag Anirudh J. Suraj Kumar Jha Chai Aur Code Jay Kadlag #Chaicode #Cohort #NodeJS #JavaScript #BackendDevelopment #WebDevelopment #NodeArchitecture #Programming #DevCommunity

𝗧𝘆𝗽𝗲𝗦𝗰𝗿𝗶𝗽𝘁 𝟳 is not about new features. It is about making TypeScript faster. Before, the TypeScript compiler worked on Node.js. Node.js is single-threaded, so it cannot use all CPU cores. Because of this, large projects can feel slow. Builds take more time, and sometimes the editor becomes slow too. Now, TypeScript 7 is being rewritten in Go programming language. This makes it a native tool, not just a JavaScript program. Because of that: 𝗶𝘁 𝗰𝗮𝗻 𝘂𝘀𝗲 𝗺𝘂𝗹𝘁𝗶𝗽𝗹𝗲 𝗖𝗣𝗨 𝗰𝗼𝗿𝗲𝘀 𝗶𝘁 𝘄𝗼𝗿𝗸𝘀 𝗳𝗮𝘀𝘁𝗲𝗿 𝗶𝘁 𝘂𝘀𝗲𝘀 𝗺𝗲𝗺𝗼𝗿𝘆 𝗯𝗲𝘁𝘁𝗲𝗿 In real projects, this means: faster build time faster autocomplete and navigation better performance in big projects and monorepos 𝗜𝗺𝗽𝗼𝗿𝘁𝗮𝗻𝘁: nothing changes in your code. You write the same TypeScript as before. This is not a new language. It is a faster engine. #TypeScript #FrontendEngineering #JavaScript #SoftwareEngineering #DX

I noticed most Node.js logging solutions are either too heavy or too minimal. So I built my own — logpaint 🎨 A lightweight, zero-dependency colored logger with built-in levels and TypeScript support. Instead of adding another heavy logging library, I wanted something: • Minimal • Zero config • Typed • Colorful output • Runtime level switching 💻 Website - https://lnkd.in/gp3HgeBX 🔴 NPM - https://lnkd.in/gNuSPXd4 ♐ GitHub - https://lnkd.in/gVXkyu-P Would love feedback from fellow developers 🙌 What feature should I add next? #opensource #nodejs #typescript #javascript #buildinpublic #developers #webdev #programming

The "Magic" of the Node.js Event Loop, Explained. Tonight’s Chai Aur Code session was a deep dive into the internals of Node.js. It’s one thing to write a server; it's another to understand how it actually breathes. 🧠 The execution flow we broke down: 1️⃣ Initial Phase: Top-level code runs first, followed by imports. 2️⃣ Registration: Event callbacks are registered. 3️⃣ The Event Loop: This is where the real work happens in 4 distinct phases: - Expired Callbacks: Processing setTimeout and setInterval. - I/O Polling: Handling network, file systems, etc. - setImmediate(): The "Check" phase. - Close Callbacks: Wrapping up resources. Understanding these internals changes how you think about performance and asynchronous logic. Huge thanks to Piyush Garg for the clarity! Anirudh J. Hitesh Choudhary Akash Kadlag Jay Kadlag #NodeJS #BackendDevelopment #JavaScript #ChaiAurCode #SoftwareEngineering #BuildInPublic #HiteshChoudhary

Yesterdays's Node.js class was really amazing 🤩. We deeply discuss about the internals and working mechanism of Node.js in our local system and how the javascript code runs differently in node environment than the browser(chrome). The execution flow actually looks like:- JavaScript Code -> Node.js C++ Bindings -> V8 Engine + libuv -> Operating System Key technologies :- -> The V8 Engine is a high-performance JavaScript engine developed by Google. It is responsible for executing JavaScript code by converting it into machine code that the computer’s CPU can understand. V8 is written mainly in C++ and is used in environments like Google Chrome and Node.js. -> Node.js uses libuv, a C library that handles asynchronous operations. libuv provides some important properties:- 1.Event loop 2.Thread pool 3.Asynchronous file I/O 4.Networking This allows Node.js to remain single-threaded for JavaScript but still perform many background operations. Thanks to Piyush Garg , Hitesh Choudhary #chaicode #javascript #nodejs #backenddevelopment

Today Class was on Internals of Node.js! Understood how Node.js runs on a single main thread, uses the event loop to handle async tasks, and a thread pool (default 4 threads) for heavy operations. Also learned how phases like I/O polling, expired callbacks, and setImmediate work behind the scenes. Really interesting to see how Node.js executes code internally. #NodeJS #NodeJSInternals #JavaScript #EventLoop #ChaiCohort26 #Chaicode Hitesh Choudhary Chai Code #piyushgarg Anirudh Jwala Akash Kadlag Jay Kadlag JavaScript

🚀 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