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In today’s session, we explored the Inner Workings of Node.js. 🔹 1. Node.js and libuv Node.js relies on the libuv library to implement the event loop and handle asynchronous operations such as file I/O, networking, and timers. 🔹 2. How Node.js Executes Code Before the event loop starts, Node.js goes through several steps: 👉 Initialize the project environment 👉 Execute top-level code 👉 Process import / require statements 👉 Register event callbacks (timers, I/O handlers, etc.) 👉 Start the event loop 🔹 3. Event Loop Phases Once the event loop begins, Node.js processes tasks in phases: 👉 Execute expired timers/callbacks queued earlier 👉 Perform I/O polling (file reads, network requests) 👉 Run immediate callbacks (setImmediate) 👉 Close callbacks and perform cleanup #NodeJS #JavaScript #BackendDevelopment #WebDevelopment #LearningInPublic Thanks Hitesh Choudhary | Piyush Garg | Jay Kadlag | Anirudh J.|Chaicode Team

🚀 I Finally Understood the Node.js Event Loop And it made Node.js make so much more sense. Most developers use Node.js daily. But very few understand what happens behind the scenes. Here are 3 things I learned today 👇 🔹 1. Node.js Uses libuv libuv powers the event loop and handles async tasks like: • File operations • Network requests • Timers This is why Node.js is non-blocking and scalable. 🔹 2. Before the Event Loop Starts Node.js first: • Initializes the environment • Executes top-level code • Loads modules (require / import) • Registers callbacks Only then does the event loop begin. 🔹 3. Event Loop Phases Once running, Node.js processes tasks in phases: 1️⃣ Timers 2️⃣ I/O callbacks 3️⃣ Polling 4️⃣ setImmediate 5️⃣ Close callbacks Understanding this helps write better async code. Big thanks to Hitesh Choudhary, Piyush Garg, Jay Kadlag for the amazing explanation. #NodeJS #JavaScript #BackendDevelopment #WebDevelopment

🚀 Event Loop in Node.js — The Reason Your API Is Fast (or Slow) Node.js is fast… But only if you understand the Event Loop. If not 👇 👉 Slow responses 👉 Delayed requests 👉 Poor performance 😐 🔹 What is Event Loop? It handles all async operations in Node.js Single thread Non-blocking Processes tasks in phases 🔹 Common mistakes ❌ Blocking code (sync functions) ❌ Heavy computation in main thread ❌ Large loops / CPU-heavy tasks ❌ Ignoring async patterns ❌ Poor promise handling 🔹 What experienced devs do ✅ Use async/await properly ✅ Break heavy tasks into smaller chunks ✅ Use Worker Threads for CPU tasks ✅ Use queues (Bull, RabbitMQ) ✅ Monitor event loop lag ⚡ Simple rule I follow If Event Loop is blocked… Everything is blocked. Node.js doesn’t scale by threads… It scales by non-blocking design. Have you ever faced event loop blocking issues? 👇 #NodeJS #BackendDevelopment #JavaScript #API #EventLoop #WebDevelopment

🚀 Built a Node.js server and started understanding how backend systems handle requests (and where things can go wrong if not handled securely) When a client sends a request, Node.js doesn’t create a new thread like traditional servers. Instead, it uses: → Event Loop → Non-blocking I/O This is why Node.js can handle multiple requests efficiently. Here’s what I implemented: ✔ Created server using http module ✔ Handled request and response ✔ Sent HTML response to browser But the interesting part: If we block the event loop (e.g., heavy computation), the whole server slows down. 👉 That’s why async programming (Promises, async/await) is critical. Next step: Building REST APIs with Express 🚀 #NodeJS #JavaScript #BackendDevelopment #LearningInPublic

Most React devs think RSC is about performance. It's not. It's about where your code lives. React Server Components let you fetch data, access your database, and keep secrets — all at the component level — without shipping a single byte of that logic to the browser. Here's the mental shift that changed how I think about it: → Not "how do I make this faster?" → But "does this actually need to run in the browser?" If the answer is no — it belongs on the server. The "use client" directive isn't a default. It's an opt-in for interactivity. Everything else? Server by default. What this unlocks: ✅ Direct DB calls inside components ✅ API keys that never touch the client ✅ Smaller JS bundles without the effort ✅ Cleaner data fetching — no useEffect waterfalls The hardest part isn't the syntax. It's unlearning the habit of reaching for "use client" everywhere. If you're building with Next.js 13+ and haven't fully leaned into RSC yet — start small. Pick one data-fetching component and move it to the server. You'll feel the difference immediately. 💬 Are you using React Server Components in production? What's been your biggest challenge? #ReactServerComponents #React #NextJS #Frontend #WebDevelopment #JavaScript #SoftwareEngineering #Programming #TechTips #ReactJS

I used Node.js for a long time… but today I finally explored what happens behind the scenes. ⚙️ Node.js isn’t just JavaScript running on a server. It’s powered by a few powerful components: • V8 Engine → Converts JavaScript into machine code • Event Loop → Handles asynchronous operations efficiently • libuv → Enables non-blocking I/O and manages the thread pool • Event Queue → Stores incoming requests • Thread Pool → Executes heavy tasks in the background All these pieces work together to make Node.js fast, scalable, and non-blocking. Hitesh Choudhary | Piyush Garg | Akash Kadlag | Jay Kadlag Understanding the internal architecture makes you appreciate why Node can handle thousands of concurrent requests with ease. What backend concept are you exploring this week? 🚀 #NodeJS #BackendDevelopment #JavaScript #WebDevelopment #EventLoop #SoftwareEngineering #CodingJourney #chaicode

🚀 Node.js Event Loop: Node.js is single-threaded, yet it handles thousands of requests efficiently — thanks to the Event Loop. 👉 The Event Loop is a mechanism that continuously checks the Call Stack and Task Queues to execute asynchronous operations without blocking the main thread. 💡 How it works: 1. Executes synchronous code first (Call Stack) 2. Moves async tasks (like APIs, timers, I/O) to Web APIs 3. Pushes completed tasks to Callback Queues 4. Event Loop picks tasks from queues when the stack is empty 🔄 Phases of Event Loop: • Timers (setTimeout, setInterval)  • I/O Callbacks  • Idle, Prepare  • Poll (fetch new I/O events)  • Check (setImmediate)  • Close Callbacks 🔥 Key takeaway: Non-blocking I/O + Event Loop = High scalability #NodeJS #JavaScript #BackendDevelopment #WebDevelopment #EventLoop #OpenSource

Probably one of the quietest dev tool you’ll ever meet , but but but , it got a point. Next.js + "use client" = chaos. Built Next Component Analyzer to stop the guessing game: Detects React hooks, Next navigation hooks, browser APIs Scans your components for JSX events Suggests Server vs Client Highlights unnecessary "use client" Works in JS or TS projects. Zero headache probably. Just clarity. https://lnkd.in/gGCcN9aa Your components will behave. You’ll be calmer. Your future self will nod approvingly. *P.S. If the analyzer roasts your component architecture… that's between you and your React hooks.* #NextJS #NodeJS #DevTools #OpenSource #JavaScript #Coding #SoftwareEngineering

React 19 is changing how we think about state, async flows, and data handling. 👉 Explore the full comparison guide 🔗 https://shorturl.at/8VO3v 📌 What you’ll discover: ➜ What React 19 Actions actually are and how they work ➜ How Actions simplify async logic, forms, and state updates ➜ Where Redux still makes sense and where it doesn’t ➜ Key differences in complexity, scalability, and developer experience ➜ When to choose Actions, Redux, or a hybrid approach React 19 Actions reduce the need for heavy state management ⚡ ✍ Written by Pruthvi Darji and Utsav Khatri #ReactJS #Redux #FrontendDevelopment #JavaScript #WebDevelopment #SoftwareEngineering #React19 #DeveloperTools

🚀 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