Node.js Event Loop Explained

Mastering the Node.js Event Loop is essential for anyone working with this technology. Understanding the Event Loop can be a game changer. The Event Loop is what makes Node.js non-blocking and highly scalable. It handles operations in several phases: - Timers: Executes setTimeout and setInterval - Pending Callbacks: Handles I/O callbacks - Idle/Prepare: For internal use - Poll: Fetches new I/O events - Check: Executes setImmediate - Close Callbacks: Manages cleanup operations A key insight to remember is that Node.js doesn’t run everything at once; it smartly queues tasks and executes them phase by phase, ensuring efficient performance. As a bonus tip, understanding the difference between setTimeout, setImmediate, and process.nextTick can significantly enhance your debugging and optimization skills. #NodeJS #JavaScript #BackendDevelopment #EventLoop #WebDevelopment #CodingTips

Node.js is dying Most devs think replacing it with Bun is a no-brainer due to its 5x throughput boost. But what they miss is that this shift also means relearning entire ecosystems and toolchains. Can we really afford to ditch the massive Node.js community for a speed bump? . . . . #MERNstack #Nodejs #Bun #JavaScript #DevDebate

Day 65/100 – Starting with Node.js 🚀 Learned: What Node.js is and how it allows JavaScript to run outside the browser Basic idea of the Event Loop and how Node handles multiple requests efficiently Introduction to Express and how it simplifies backend development What stood out: Node.js doesn’t work like traditional synchronous systems. Instead of waiting, it handles tasks asynchronously using the event loop, making it fast and scalable. #NodeJS #BackendDevelopment #JavaScript #LearningInPublic #100DaysOfCode

While working on a full-stack project with Next.js, I sometimes needed to quickly check environment variables without modifying the code. Here’s a simple way to do it directly from the terminal (required 'dotenv' library): Check env value: node -e "require('dotenv').config(); console.log(process.env.DATABASE_URL)" It’s a small tip, but quite useful when you want to check env value. I’ll probably share a few more small things like this from my project along the way. #nextjs #nodejs #dotenv #webdevelopment #softwareengineering #buildinpublic #javascript #devtips #webdevUK

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

🚀 Understanding Node.js Internals: Event Loop & Thread Pool This week, I took a deeper dive into how Node.js actually works behind the scenes — and it completely changed how I think about asynchronous code. 🔹 JavaScript in Node.js runs on a single thread 🔹 Yet it handles multiple tasks efficiently using the Event Loop 🔹 Heavy operations are offloaded to the Thread Pool (via libuv) Some key takeaways: Event Loop manages execution in phases (Timers, I/O, setImmediate, etc.) setTimeout(0) is not truly immediate setImmediate() behaves differently inside vs outside I/O process.nextTick() runs before the event loop even starts Understanding these concepts makes async behavior much more predictable and helps write better backend code. Would love to hear your thoughts or corrections 🙌! Blog Link : https://lnkd.in/gxBA4DeT #JavaScript #WebDev #LearnInPublic #Blog #libuv #EventLoop #ThreadPool #ChaiCode Thanks to Hitesh Choudhary, Piyush Garg, Jay Kadlag, Akash Kadlag for guidance 😊

Excited to share a new episode of Beyond Node.js ✨🎉 This time, we sit down with Ulises Gascón — TC39 delegate and maintainer of widely used JavaScript tools — to talk about what actually matters in production. We cover: • The worst things seen in real Node.js applications • Common misconceptions about Node.js in production • What teams should really focus on If you're working with Node.js in production, this conversation is for you. Watch the full episode in the comments 👇🏼 #Nodejs #JavaScript #Backend #SoftwareEngineering #OpenSource

I just published a new blog about how Node.js actually works under the hood. When we use Node.js it feels like JavaScript can do everything - read files, make network requests, talk to the OS. But JavaScript alone can't do those things. Inside Node.js, a few key components work together: V8 → runs JavaScript C++ bindings → connect JS to native code libuv → handles async operations and the event loop Understanding this made Node.js architecture much clearer for me, so I wrote a simple breakdown. Read it here: https://lnkd.in/dhYkXwQc #nodejs #javascript #backend #webdevelopment #chaicode

Ever wondered how Node.js works behind the scenes? 🤔 In my latest blog, I broke down Node.js internals in a simple way — focusing on the 3 core components: 🔹 V8 Engine (executes JS & manages memory) 🔹 Libuv (handles async tasks & event loop) 🔹 Bindings (connects V8 with system-level operations) Understanding this flow really changes how you look at things like fs.readFile() or setTimeout() 💡 👉 Read the full blog here: https://lnkd.in/g-AbBCiy I’d really appreciate your thoughts, feedback, or any experiences you’ve had while working with event propagation 😊 Hitesh Choudhary | Piyush Garg | Akash Kadlag #JavaScript #WebDevelopment #Blog #NodeJs #Cohort2026 #LearnInPublic #libuv #v8