Node.js Thread Pool Limitations: Understanding the Impact on Performance

Most important question that was asked in React Developer interview Sharing the questions here in case it helps someone preparing for similar roles. Some of the questions they asked: 1. What is React and why is it efficient? 2. How does React work internally? 3. What is the most challenging task you handled in your project? 4. Is JavaScript tightly coupled or loosely coupled? 5. Why do we use TypeScript? 6. How does "extends" work in TypeScript and what is the difference between type and interface? 7. How does Redux work, from installation to usage in a project? 8. Have you used Redux Toolkit (RTK) or TanStack Query? 9. What is the difference between bind and apply in JavaScript? 10. What has been your experience with useCallback and useMemo in real projects? 11. What is the role of the dependency array in useEffect? Overall, the round was focused on practical understanding of React, TypeScript and JavaScript rather than just theory. 👨💻 Follow for daily React, and JavaScript #React #JavaScript #TypeScript #Redux #Frontend #InterviewExperience #capgemini

Day 16 of sharing interview questions to help you land your next role! Today's focus: Node.js — beginner & intermediate level questions! Q1: What is Node.js? Node.js is an open-source, cross-platform runtime environment that allows you to run JavaScript code outside of a browser — typically on a server. Q2: Why is Node.js popular for backend development? Because it is fast, lightweight, and uses JavaScript — so frontend developers can easily transition to backend development without learning a new language. Q3: What is npm? npm stands for Node Package Manager. It is used to install, share, and manage packages/libraries in a Node.js project. Q4: What is the difference between require() and import in Node.js? require() is the older CommonJS way of importing modules, while import is the modern ES6 syntax. Both are used to bring in external files or packages into your code. Q5: What is a callback function in Node.js? A callback is a function passed as an argument to another function, which gets executed after a task is completed. It is commonly used to handle asynchronous operations like reading files or making API calls. Follow for Day 17 — more questions dropping tomorrow! #NodeJS #BeginnerDeveloper #InterviewPrep #JavaScript #BackendDevelopment #TechJobs #Day16

One React trick that saved me hours last week: Instead of useState + useEffect to fetch data, try a custom hook. Before: 15 lines of messy fetch logic inside the component. After: One line — const { data, loading } = useProfile(userId) Clean. Reusable. Testable. This is the kind of thing that separates junior from mid-level React devs. Are you using custom hooks in your projects? Share your favorite one. #ReactJS #WebDevelopment #JavaScript #FrontendDeveloper #CodeTips

53 topics. 102 questions. 4 days. One platform. 20 tabs open. Half too basic, half too academic. No structure. And every time I came back next day I'd forget where I left off. So I just built what I needed. A platform for my own learning. 53 topics, 102 interview questions, 4 days. Day 1: JavaScript + Browser APIs Day 2: React internals (Fiber, hooks, re-renders, patterns) Day 3: Next.js (SSR, SSG, server components, middleware) Day 4: System design, security, testing, performance Each topic has 3 explanation levels. Layman, mid, senior. Senior isn't just "what is X". It's how you'd actually break it down in an interview. Spent the most time on that part. Collected the most asked interview questions with answers from multiple sources and LinkedIn posts. Added those too. Progress tracking is there because I literally kept forgetting which topic I was on lol. Sign up and it saves across devices. This was built for me. Not a polished product. There will be bugs. But the content covers pretty much everything that comes up in frontend rounds. I know a lot of devs are going through the same thing right now. Prepping alone, 50 resources open, no idea what you've covered and what you haven't. If this saves even one person some time, worth sharing. Link: https://lnkd.in/de49nsKY #frontend #react #nextjs #javascript #interviewprep

🚀 𝗠𝗮𝘀𝘁𝗲𝗿 𝗡𝗼𝗱𝗲.𝗷𝘀 – 𝗘𝘀𝘀𝗲𝗻𝘁𝗶𝗮𝗹 𝗚𝘂𝗶𝗱𝗲 𝗳𝗼𝗿 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿𝘀 Node.js has become one of the most powerful tools for building scalable, high‑performance applications. From backend APIs to full‑stack solutions, it’s a must‑have skill for modern developers. 📌 If you’re preparing for interviews or simply strengthening your backend fundamentals, this resource will help you:  • Understand core Node.js concepts  • Learn about event‑driven architecture  • Explore asynchronous programming  • Review popular modules & frameworks  • Practice real‑world use cases Keep learning. Keep building. Keep growing. Credit: Respective Owner Follow Alpna P. for more related content! 🤔 Having Doubts in technical journey? 🚀 Book 1:1 session with me : https://lnkd.in/gQfXYuQm 🚀 Subscribe and stay up to date: https://lnkd.in/dGE5gxTy 🚀 Get Complete React JS Interview Q&A Here: https://lnkd.in/d5Y2ku23 🚀 Get Complete JavaScript Interview Q&A Here: https://lnkd.in/d8umA-53 #NodeJS #BackendDevelopment #JavaScript #WebDevelopment #SoftwareEngineering #InterviewPrep

🚀 𝗠𝗮𝘀𝘁𝗲𝗿 𝗡𝗼𝗱𝗲.𝗷𝘀 – 𝗘𝘀𝘀𝗲𝗻𝘁𝗶𝗮𝗹 𝗚𝘂𝗶𝗱𝗲 𝗳𝗼𝗿 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿𝘀 Node.js has become one of the most powerful tools for building scalable, high‑performance applications. From backend APIs to full‑stack solutions, it’s a must‑have skill for modern developers. 📌 If you’re preparing for interviews or simply strengthening your backend fundamentals, this resource will help you:  • Understand core Node.js concepts  • Learn about event‑driven architecture  • Explore asynchronous programming  • Review popular modules & frameworks  • Practice real‑world use cases Keep learning. Keep building. Keep growing. Credit: Respective Owner Follow Alpna P. for more related content! 🤔 Having Doubts in technical journey? 🚀 DM & Book 1:1 session with me #NodeJS #BackendDevelopment #JavaScript #WebDevelopment #SoftwareEngineering #InterviewPrep

As a full stack developer, one question I kept seeing was: GraphQL or REST? So I broke it down properly. I just published my first technical article: GraphQL vs REST: A Practical Comparison for Full Stack Developers In it I cover: - What REST is and where it struggles - What GraphQL is and how it solves over-fetching and under-fetching - A real-world scenario showing both side by side - When to use each one in production If you're a developer who has ever made 3 API calls just to render one screen, this one is for you. Read it here: https://lnkd.in/eHBrPYxG #GraphQL #REST #WebDevelopment #FullStack #JavaScript #TechnicalWriting #NodeJS #React #SoftwareEngineering

🚀 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

🚀 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 😊

🚀 Mastering React Hooks . ➡️ useState batching & functional updater pattern ➡️ useEffect cleanup, dependency array pitfalls ➡️ useLayoutEffect vs useEffect - when to use each ➡️ useRef - mutable values without re-renders ➡️ useMemo — referential stability vs computation cost ➡️ useCallback - stable function references ➡️ useReducer - complex state machines ➡️ useContext - consumer re-render behaviour ➡️ custom hooks - extraction & composition patterns ➡️ uselmperativeHandle + forwardRef ➡️ useDeferredValue & UseTransition (React 18) ➡️ useld, useSyncExternalStore (React 18) 🚀 Follow Chinmay Kulkarni for more . #React #ReactJS #ReactHooks #FrontendDevelopment #JavaScript #WebDevelopment #FrontendEngineer #SoftwareEngineering #CodingInterview #InterviewPreparation #React18 #PerformanceOptimization #TechCareers #Developers #SeniorDeveloper