Node.js Interview Question: Why Add 'module' in package.json?

Just created a Node.js Backend Interview PDF 📘 It includes: – 50 important Node.js + backend questions – Simple, easy-to-understand answers – Covers APIs, authentication, caching, and more This is useful for: ✔ Quick revision ✔ Understanding core concepts ✔ Gaining confidence before interviews If you're preparing for backend or full-stack roles, this can help you get started. #NodeJS #BackendDevelopment #InterviewPreparation #JavaScript #FullStackDeveloper

𝐑𝐞𝐚𝐜𝐭 𝐮𝐬𝐞𝐄𝐟𝐟𝐞𝐜𝐭 𝐈𝐧𝐟𝐢𝐧𝐢𝐭𝐞 𝐋𝐨𝐨𝐩 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰 𝐐𝐮𝐞𝐬𝐭𝐢𝐨𝐧 🚨 Many React developers face this problem… but can’t explain why it happens in interview. Question: Why does useEffect cause infinite loop sometimes? Example ❌ const [count, setCount] = useState(0); useEffect(() => { setCount(count + 1); }, [count]); What happens here? ➡ count changes ➡ useEffect runs ➡ setCount updates state ➡ state change triggers useEffect again ➡ loop continues forever This creates an infinite re-render loop. Correct way ✅ useEffect(() => { setCount(prev => prev + 1); }, []); Why this works? Because empty dependency array runs useEffect only once. Tip for React Interviews: Always check dependency array carefully. Most infinite loop bugs come from wrong dependencies. More React interview questions coming 🚀 #ReactJS #useEffect #FrontendDeveloper #JavaScript #WebDevelopment #CodingInterview #ReactInterview #NextJS #SoftwareDeveloper

🚀 Understanding the Node.js Event Loop – Interview Question A common question in JavaScript / Node.js interviews is about the execution order of asynchronous operations. In this example, we explore how process.nextTick, Promises, setTimeout, and setImmediate are executed inside the Node.js Event Loop. Key takeaway: 📌 process.nextTick() runs before Promise microtasks 📌 Promise callbacks run before timer callbacks 📌 setTimeout() runs in the Timers phase 📌 setImmediate() runs in the Check phase Understanding this order is very important for debugging async code and clearing backend interviews. #nodejs #javascript #eventloop #backenddevelopment #asyncjavascript #webdevelopment #softwareengineering #interviewquestions #techinterview #codinginterview

💡 State vs Props vs Hooks in React JS – Repeated Interview Questions | Day 21 Understanding the difference between State and Props is very important for every React developer. 🔵 State ✔ Manages internal component data ✔ Can change (mutable) ✔ Triggers re-render ⚪ Props ✔ Passed from parent component ✔ Read-only (immutable) ✔ Used for communication 🎯 Interview Tips: State manages data, Props pass data. Mastering this concept makes your React fundamentals strong and helps you crack interviews confidently 🚀 Are you comfortable with State & Props? 👨💻 Follow for daily React, and JavaScript 👉 Arun Dubey #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #Day21

Headline: 🚀 Master Your Next React Interview: 100 Questions from Junior to Expert Preparing for a React interview can feel like trying to hit a moving target. Whether you're just starting with useState or architecting complex systems with Fiber and Server Components, you need a roadmap. I’ve compiled a comprehensive list of 100 React JS Interview Questions, categorized by difficulty, to help you (or your team) level up. 🔹 Junior: Fundamentals, JSX, and Hooks. 🔹 Intermediate: Performance, Patterns, and Logic. 🔹 Senior: Architecture, Testing, and SSR. 🔹 Expert: React Internals, Fiber, and System Design. Check out the list below and save this for your next prep session! Which of these would you find hardest to answer on the spot? 👇 #ReactJS #WebDevelopment #Frontend #CodingInterview #JavaScript #CareerGrowth

Most people fail Node.js interviews not because they don’t know coding… But because they forget the basics. I found a Node.js revision sheet that covers 120+ important questions in one place. Honestly, this is the kind of resource you wish you had 1 day before your interview. 📌 It covers: • Event loop, async behavior and non-blocking I/O • Promises, async/await and real-world flow • Express, routing and middleware • Streams, buffers and core modules • JWT authentication and security basics • Scaling, clustering and system design The best part? It’s short, to the point, and perfect for quick revision. 📄 Check it out here: Save this now. You’ll thank yourself before your next interview. Follow Muhammad Nouman for more useful content #NodeJS #BackendDeveloper #InterviewPrep #JavaScript #Developers #LearnToCode #TechCareers

I compiled a small JavaScript + React interview questions for quick revision. It includes common frontend interview topics with questions, answers, and short explanations, such as: • Hoisting, Closures, Event Loop • Promises, Microtasks vs Macrotasks • Virtual DOM & Reconciliation • React Hooks and performance concepts • CSR vs SSR and Hydration Sharing it in case it helps someone preparing for frontend interviews. #javascript #reactjs #FrontendDevelopment #InterviewPreparation #SoftwareEngineering

React Interview Question: What are Custom Hooks in React? Answer: Custom hooks are JavaScript functions that allow you to reuse stateful logic across multiple components. They follow the naming convention starting with "use". Example: 𝘧𝘶𝘯𝘤𝘵𝘪𝘰𝘯 𝘶𝘴𝘦𝘞𝘪𝘯𝘥𝘰𝘸𝘞𝘪𝘥𝘵𝘩() {  𝘤𝘰𝘯𝘴𝘵 [𝘸𝘪𝘥𝘵𝘩, 𝘴𝘦𝘵𝘞𝘪𝘥𝘵𝘩] = 𝘶𝘴𝘦𝘚𝘵𝘢𝘵𝘦(𝘸𝘪𝘯𝘥𝘰𝘸.𝘪𝘯𝘯𝘦𝘳𝘞𝘪𝘥𝘵𝘩)  𝘶𝘴𝘦𝘌𝘧𝘧𝘦𝘤𝘵(() => {   𝘤𝘰𝘯𝘴𝘵 𝘩𝘢𝘯𝘥𝘭𝘦𝘙𝘦𝘴𝘪𝘻𝘦 = () => 𝘴𝘦𝘵𝘞𝘪𝘥𝘵𝘩(𝘸𝘪𝘯𝘥𝘰𝘸.𝘪𝘯𝘯𝘦𝘳𝘞𝘪𝘥𝘵𝘩)   𝘸𝘪𝘯𝘥𝘰𝘸.𝘢𝘥𝘥𝘌𝘷𝘦𝘯𝘵𝘓𝘪𝘴𝘵𝘦𝘯𝘦𝘳("𝘳𝘦𝘴𝘪𝘻𝘦", 𝘩𝘢𝘯𝘥𝘭𝘦𝘙𝘦𝘴𝘪𝘻𝘦)   𝘳𝘦𝘵𝘶𝘳𝘯 () => 𝘸𝘪𝘯𝘥𝘰𝘸.𝘳𝘦𝘮𝘰𝘷𝘦𝘌𝘷𝘦𝘯𝘵𝘓𝘪𝘴𝘵𝘦𝘯𝘦𝘳("𝘳𝘦𝘴𝘪𝘻𝘦", 𝘩𝘢𝘯𝘥𝘭𝘦𝘙𝘦𝘴𝘪𝘻𝘦)  }, [])  𝘳𝘦𝘵𝘶𝘳𝘯 𝘸𝘪𝘥𝘵𝘩 } Explanation: Custom hooks help: 1. reuse logic 2. reduce duplicate code 3. improve component readability Follow-up Interview Question: Do custom hooks share state between components? Answer: No. Explanation: Each component calling the hook gets its own independent state instance. #reactjs #CustomHooks #FrontendDevelopment #WebDevelopment

Most people fail Node.js interviews not because they don’t know coding… but because they forget the basics. I found a Node.js revision sheet that covers 120+ important questions in one place. Honestly, this is the kind of resource you wish you had 1 day before your interview. 📌 It covers: • Event loop, async behavior and non-blocking I/O • Promises, async/await and real-world flow • Express, routing and middleware • Streams, buffers and core modules • JWT authentication and security basics • Scaling, clustering and system design The best part? It’s short, to the point, and perfect for quick revision. 📄 Check it out here: Save this now. You’ll thank yourself before your next interview. #NodeJS #BackendDeveloper #InterviewPrep #JavaScript #Developers #LearnToCode #TechCareers

Most people fail Node.js interviews not because they don’t know coding… but because they forget the basics. I found a Node.js revision sheet that covers 120+ important questions in one place. Honestly, this is the kind of resource you wish you had 1 day before your interview. 📌 It covers: • Event loop, async behavior and non-blocking I/O • Promises, async/await and real-world flow • Express, routing and middleware • Streams, buffers and core modules • JWT authentication and security basics • Scaling, clustering and system design The best part? It’s short, to the point, and perfect for quick revision. 📄 Check it out here: Save this now. You’ll thank yourself before your next interview. #NodeJS #BackendDeveloper #InterviewPrep #JavaScript #Developers #LearnToCode #TechCareers