Node.js Internals Explained: GitHub Repository Breakdown

Node.js runs on a single thread, yet it handles thousands of requests without breaking a sweat. The reason behind this is the Event Loop. It is one of those concepts that sounds complicated but makes complete sense once you see it the right way. When Node.js hits a slow task like reading a file or calling a database, it does not sit and wait. It registers the task, moves on to the next one, and comes back when the result is ready. This is what "non-blocking" actually means in practice. In my latest blog post I covered everything you need to understand this from scratch. What the event loop is and how it cycles through phases. Why setTimeout behaves the way it does. How Node.js stays fast without running multiple threads. Where it actually struggles, because it is not perfect for everything. If you are learning backend development or just getting into Node.js, this is worth 5 minutes of your read. Blog link is in the comment section below. #nodeJS #eventLoop #backendDevelopment

I still remember my first time seeing nested callbacks in Node.js. It looked like a sideways pyramid of doom. 📐 If you’re learning backend development, async code is usually the first big hurdle. But here’s the truth: once you understand *why* Node.js does things asynchronously, it stops feeling like magic and starts feeling like a superpower. I just published a beginner-friendly guide that walks through: 🔹 Why Node.js is single-threaded but non-blocking 🔹 How callbacks actually execute under the hood 🔹 Why “callback hell” happens (and how to avoid it) 🔹 Promises: the cleaner, modern alternative No jargon. Just clear examples, step-by-step breakdowns, and side-by-side code comparisons. 📖 Read it here: https://lnkd.in/g4Tk-yDg What part of async JS confused you the most when you started? Let’s chat in the comments. 👇 #NodeJS #JavaScript #WebDevelopment #BackendDev #CodingJourney

NestJS didn't change how I write code. It changed how I think about it. I spent 5 years writing Node.js + Express apps. They worked. But every codebase looked different. Every team had their own "way." And onboarding new devs? A nightmare. Then I picked up NestJS — and something clicked. Here's what actually changed for me: @Controller, @Injectable, @Module — suddenly my code had intention. Not just functions calling functions, but a real architecture with clear contracts. The things that made the difference: — Dependency Injection built-in (no more manual wiring) — Guards + Interceptors + Pipes = clean separation of concerns — Modules that force you to think in bounded contexts — First-class TypeScript that actually catches your mistakes — Swagger auto-docs with zero extra effort The controversial take? Express gives you freedom. NestJS gives you structure. And in a team setting, structure always wins. I've seen junior devs onboard to NestJS codebases in days — not weeks. That alone is worth the switch. If you're still building raw Express APIs in 2026, I'm not judging — but I am curious: what's stopping you from trying NestJS? Drop your honest take below 👇 #NestJS #NodeJS #TypeScript #BackendDevelopment #SoftwareEngineering #WebDev #API

React Native devs — your FlatList is gaslighting you. You update your state. Your component re-renders. But the list? Completely unbothered. Same stale UI. No changes. Nothing. Sound familiar? The fix is a single prop you're probably not using: extraData. In my latest post, I break down: ✅ Why FlatList ignores your state updates ✅ What extraData actually does (and doesn't do) ✅ The mistakes that tank your list performance ✅ Real code examples — broken vs. fixed If you've ever lost 2 hours to a list that wouldn't re-render, this one's for you. 🔗 [Link in comments]

I've been writing Node.js for over 10 years, and I still get asked: "Is it actually production-ready?" Here's what I tell them: - Netflix cut startup time by 70% after migrating to Node. - LinkedIn reduced servers from 30 to 3. - Uber rebuilt their dispatch system on it. Node.js is not a toy. It never was. What makes Node.js genuinely powerful in 2025: - Non-blocking I/O — one thread, thousands of concurrent connections - V8 engine — the same runtime that powers Chrome - 6.3M npm packages — a solution exists for almost anything - Native TypeScript in v22 — zero-config type safety - Worker Threads — true parallelism for CPU-heavy tasks The "single-threaded" criticism? That was 2015. The real reason Node wins? Your frontend developers already know JavaScript. Now they can own the full stack. Shared types, shared validation logic, and one language end to end. This is a significant advantage in hiring, shipping, and maintenance. If you're evaluating backend runtimes in 2025: - Node.js v22 LTS is rock solid. - Bun is fast and rising. - Deno 2.0 finally has npm compatibility. But if your team knows JavaScript and you need to ship, Node is still the safest, most battle-tested choice. What's your stack in 2026? Drop it below.

Next.js 14 dropped a while back now, and I've finally spent enough time with it to have an actual opinion rather than just reading the release notes like everyone else. The Server Components story is genuinely solid. I've built three client projects on it this year, and the mental model actually makes sense once you stop thinking about it like traditional React. What's catching people out though: they're treating it like magic. "Just use Server Components and your app gets faster." No. You still need to understand what's happening. You still need to think about where data lives, when it fetches, what gets sent to the browser. The framework just gives you better tools to make sensible decisions. I've watched junior devs ship absolute nightmares because they assumed Next.js would handle the complexity for them. It won't. It just moves the complexity around. The real win isn't the framework. It's developers who actually understand the trade-offs. Are you using 14 in production yet, or still on an older version? Curious what's holding teams back. https://lnkd.in/eCQG6X47

Built this while working on Hexcode — a full-stack coding platform with real-time code execution and secure authentication. In this clip: • Solving the classic “Climbing Stairs” problem • Running code in a live editor • Getting instant output via backend execution Under the hood: – Node.js + Express backend – JWT-based authentication + OAuth (Google & GitHub) – Integrated external code execution API This is part of building a system that goes beyond UI — focusing on how real coding platforms work. Looking to collaborate with developers who are serious about building real-world projects. #webdevelopment #backend #fullstack #nodejs #react #projects

NodeJS Session - 2 🚀 Introduction to Node.js – From Basics to Execution Getting started with Node.js? Here’s a simple breakdown to build your foundation 👇 🔹 What & Why Node.js
Node.js is a powerful JavaScript runtime built on Chrome’s V8 engine.
It allows you to run JavaScript outside the browser, making it perfect for backend development, APIs, and real-time apps. 💡 Why developers love it:
✔ Fast & scalable (non-blocking I/O)
✔ JavaScript everywhere (frontend + backend)
✔ Huge ecosystem (NPM)
✔ Ideal for real-time applications 🔹 Installation & REPL
Getting started is easy:
1️⃣ Download Node.js (LTS version)
2️⃣ Install & verify using: * node -v * npm -v 🧠 REPL (Read, Eval, Print, Loop):
An interactive environment to quickly test JavaScript code directly in terminal. 🔹 Running JavaScript Outside Browser
Create a simple .js file and run:
👉 node app.js Example: console.log("Hello from Node.js!"); 🔥 Output:
Hello from Node.js! 💬 Mastering Node.js starts with understanding how it runs JavaScript beyond the browser. Once this clicks, backend development becomes much easier. #NodeJS #JavaScript #BackendDevelopment #WebDevelopment #Programming #Coding #Developers #TechLearning

Confession: I'm a React/Next.js expert... but a beginner at backend. 🧠 And I'm okay with that. For 2+ years, I focused on: 🔹 Responsive, accessible UIs 🔹 State management (Redux, Context, RTK Query) 🔹 Performance optimization & SSR 🔹 Clean component architecture Now I'm learning NestJS, PostgreSQL, and authentication flows. What's helping me: Building small APIs for my frontend projects Reading backend code from senior devs Breaking things on purpose (then fixing them) To every frontend dev afraid of backend: Start small. You don't need to know everything at once. Any backend tips for a motivated learner? 🙏 #FrontendDeveloper #ReactJS #NextJS #CodingJourney #FullStackLearning

🚀 Node.js is single-threaded… so how does it handle thousands of requests at the same time? I recently explored the Node.js Event Loop and it completely changed how I understand backend performance. Here’s a simple breakdown: ✔ Timers → Executes setTimeout / setInterval   ✔ Pending Callbacks → Handles system callbacks   ✔ Poll (⭐ most important) → Processes I/O events   ✔ Check → Executes setImmediate   ✔ Close Callbacks → Cleanup phase  💡 The real magic happens in the “poll” phase. While working on backend APIs, I often used async/await but never fully understood what happens internally. This cleared a lot of confusion. 🔗 Read the full article here: https://lnkd.in/dTtFG6SF Have you explored the event loop deeply? #NodeJS #BackendDevelopment #JavaScript #FullStack #WebDevelopment