Jatin Sharma’s Post

Day 55 of my #100DaysofCodeChallenge Understanding the Node.js Event Loop Today I moved from using Node.js… to understanding how it actually works internally. Node.js runs JavaScript on a single-threaded event loop. If you block that thread, your entire server stops responding. Here’s what I explored: Event Loop Phases Timers Pending Callbacks Poll Check Close Callbacks Each phase has its own callback queue. Microtask Priority process.nextTick() executes before the event loop proceeds to the next phase. Overusing it can starve the loop and freeze your app. Important Execution Detail When called inside an I/O callback: setImmediate() executes before setTimeout(0) This clarified how Node schedules work internally. I also reinforced what NOT to do in production: Avoid synchronous APIs Avoid CPU-heavy calculations on the main thread Avoid large blocking JSON operations Avoid blocking loops inside request handlers Finally, I started exploring Express.js, the minimal web framework built on top of Node’s HTTP module. Understanding the event loop changes how you design scalable systems. #NodeJS #BackendEngineering #100DaysOfCode #JavaScript #SoftwareEngineering

The 2026 Node.js Ecosystem: npm vs. Yarn vs. pnpm vs. Bun 🚀📦 Just wrapped up a research session on the current state of JavaScript package managers. If you think it's still just npm vs. Yarn, the landscape has changed significantly over the last few years. In 2026, speed and efficiency aren't just nice-to-haves; they are requirements. Here is the current breakdown of the major players powering our development: 🏢 The Classics (Package Managers) 🔹 npm (The Standard): Still the default bundled with Node.js. It has the widest compatibility and is reliable, but it remains the slowest and most disk-hungry option for large projects due to duplicated dependencies. 🔸 Yarn v4+ (The Monorepo Master): The pioneer of workspaces and stability. It remains a strong choice for complex enterprise monorepos and teams needing highly deterministic installs. 🔹 pnpm (The Disk Saver): The efficiency king among pure package managers. By using a global store and hard links, it saves gigabytes of disk space and offers significantly faster installs than npm. The Disrupter (The All-in-One Runtime) 🔸 Bun (The Speed Demon): Bun has truly shaken up the ecosystem. It's not just a package manager; it's a blazingly fast JavaScript runtime written in Zig designed to replace Node.js entirely. ▪️ Why it’s different: Install speeds are nearly instantaneous (often 30x faster than npm). ▪️ Bonus: It includes a built-in bundler, test runner, and TypeScript support right out of the box. The Verdict in 2026: For existing Node.js projects, pnpm is often the best upgrade for immediate speed and disk savings. But for new projects where raw performance is paramount, Bun is rapidly becoming the new default. Which tool is powering your workflow today? Let me know in the comments! 👇 #javascript #webdevelopment #nodejs #bunjs #pnpm #developerproductivity #techtrends2026

At first, the Node.js Event Loop felt confusing. I used to wonder: How can Node.js handle multiple requests if it is single-threaded? Then I broke it down into 4 simple parts: 1️⃣ Call Stack This is where JavaScript executes code line by line. If the stack is busy, nothing else can run. 2️⃣ Web APIs When async tasks like setTimeout(), fetch(), or file operations run, they don’t block the Call Stack. Instead, they move to Web APIs handled by the browser or Node.js environment. 3️⃣ Callback Queue Once async tasks finish, their callbacks wait here. 4️⃣ Event Loop The Event Loop constantly checks: Is the Call Stack empty? If yes → move the callback from queue to stack. That’s how Node.js handles thousands of requests efficiently — without creating new threads for every task. 🎯 What I Learned :- Understanding architecture > just memorizing syntax. Once I visualized: Call Stack → Web APIs → Queue → Event Loop Everything became clear. #NodeJS #JavaScript #BackendDevelopment #WebDevelopment #LearningInPublic #MERNStack

𝐌𝐨𝐬𝐭 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫𝐬 𝐃𝐨𝐧’𝐭 𝐔𝐧𝐝𝐞𝐫𝐬𝐭𝐚𝐧𝐝 𝐭𝐡𝐞 𝐄𝐯𝐞𝐧𝐭 𝐋𝐨𝐨𝐩 If you can’t explain the Node.js event loop clearly… You’re not done learning yet. Here’s the simple breakdown: 1️⃣ Call Stack 2️⃣ Web APIs 3️⃣ Callback Queue 4️⃣ Microtask Queue 5️⃣ Event Loop The biggest mistake I see: Developers blocking the event loop with: - Heavy loops - CPU-intensive tasks - Sync file operations Node.js is single-threaded. But that doesn’t mean it’s slow. It means you must respect the event loop. Can you explain the microtask queue without Google? 😄 🔁 Repost to support the community 👉 Follow Tapas Sahoo for more related content 🙏 #NodeJS #EventLoop #BackendEngineering #JavaScript #SystemDesign

React Series – Day 1 🚀 So… what exactly is React? React is a JavaScript library for building user interfaces. But practically? It helps you build complex UIs using small, reusable components. Instead of manipulating the DOM manually, React updates only what actually changes. That’s why it’s fast. Key ideas behind React: * Component-based architecture * Virtual DOM * Reusable UI pieces * One-way data flow Think of React like LEGO blocks. Small components → combined → complete application. Up Next: JSX — the syntax that makes React powerful. #ReactJS #FrontendDeveloper #WebDevelopment #ReactSeries

The shortcut most developers take… actually makes them slower. Everyone wants to jump straight to the exciting stuff. React. Next.js. Server components. But skipping the foundations creates a hidden problem. You don’t understand what’s actually happening. Here’s what that looks like: ↳ Learn JavaScript before React. ↳ Learn React before Next.js. ↳ Learn client-side rendering before server-side rendering. Because when you skip the layers underneath, things break in confusing ways. Skip JavaScript → React becomes magic. You call useState, but don’t really know why it works. Skip React → Next.js becomes chaos. You’re debugging routing, rendering, and component logic at the same time. Skip CSR → SSR becomes black magic. Suddenly, you’re fighting words like: • hydration • rehydration errors • "this only runs on the server" The framework didn’t fail you. The foundation did. The fastest engineers I know move quickly for one reason: They understand what’s underneath the abstraction. Not despite it. Because of it. The best time to learn things in order was when you started. The second best time is today. —— 💾 Save this for later. ♻ Repost to help others learn. ➕ Follow Petar Ivanov + turn on notifications.

🚀 Next.js Data Fetching & Rendering Strategies Next.js provides multiple strategies to fetch data and render pages, including Static Site Generation (SSG), Server-Side Rendering (SSR), Incremental Static Regeneration (ISR), and Client-Side Rendering (CSR). In this guide, we'll discuss: ✅ SSG ✅ SSR ✅ ISR ✅ CSR ✅ App directory ✅ SWR/React Query ✅ API routes ✅ Combining strategies ✅ Best practices Save & share with your team! Full-Stack Developer Starter Kit ➡️ https://lnkd.in/gvzdeSJn --- If you found this guide helpful, follow TheDevSpace | Dev Roadmap, w3schools.com, and JavaScript Mastery for more tips, tutorials, and cheat sheets on web development. Let's stay connected! 🚀 #Nextjs #DataFetching #React #JavaScript #WebDevelopment #CheatSheet #Frontend #Coding

Is React evolving… or are we just adding more layers to manage? Modern web frameworks are incredibly powerful. But somewhere along the way, they became complex enough that developers spend more time learning framework rules than solving real user problems. Hidden abstractions. Too many layers. Unexpected breaking changes. Simple ideas now feel like technical puzzles. That’s where TanStack Start feels different. It doesn’t try to reinvent everything. It focuses on clarity. Clear separation between server and browser. Built-in server-side rendering and streaming. End-to-end type safety. File-based routing that feels natural. Instead of over-engineering, it simplifies the full-stack experience, keeping backend logic close to frontend code and reducing unnecessary API layers. Maybe React doesn’t need more complexity. Maybe it just needs a reset. What do you think evolution or over-engineering? #ReactJS #WebDevelopment #FullStackDevelopment #TypeSafety #ServerSideRendering #FrontendArchitecture #JavaScript

Recently at my company, I encountered a production issue related to package transpilation in a Next.js application. At first glance, everything seemed fine. The app worked perfectly in modern browsers. But monitoring tools started reporting unexpected syntax errors originating from generated .next chunk files. After deep debugging and analyzing stack traces, I discovered the root cause: A dependency was shipping modern ESM syntax (including optional chaining), and since Next.js does not transpile node_modules by default, certain environments (bots, crawlers, older JS engines) were failing to parse the code. The issue wasn’t in our application logic—it was at the build boundary between app code and third-party packages. The solution? Using transpilePackages in next.config.ts to explicitly transpile the affected packages and ensure compatibility across all environments. I’ve written a detailed Medium article explaining: What transpilePackages is Why Next.js doesn’t transpile node_modules by default How ESM-first packages can introduce hidden production risks How to identify and resolve these issues Why understanding build systems still matters in the AI era If you’re working with Next.js, modern UI libraries, or ESM-heavy dependencies, this might save you hours of debugging. https://lnkd.in/dW3wySKn Modern frameworks abstract complexity. But production reliability still depends on understanding what happens after next build. #NextJS #JavaScript #Frontend #WebDevelopment #BuildSystems #ESM #Engineering