"Next.js Server Components: Why localStorage is undefined"

 I was working on a Next.js project and finally took the time to understand how Server and Client Components actually work. Before, I just used them, never really thought about what was happening behind the scenes. But this time, it made total sense. When you load a page, the server first renders all the HTML, text, images, and layout and sends it to the browser. So you instantly see the page, even before any JavaScript loads. It’s fast. Then, when the small JS bundle for the Client Components (like a button or form) arrives, React “wakes them up.” It attaches event listeners, enables clicks, and now those parts behave like normal React. 💡 Only the parts with "use client" actually run in the browser; the rest stay static. That’s why Server Components make your app faster and lighter. Now I get why React introduced this idea: not everything needs to run on the client side. #Nextjs #React #WebDevelopment #Frontend #LearningInPublic #JavaScript #DevJourney

What’s New in Next.js 16? 𝗖𝗮𝗰𝗵𝗲 𝗖𝗼𝗺𝗽𝗼𝗻𝗲𝗻𝘁𝘀: Partial Pre-rendering and new "use cache" directive, making caching explicit, flexible, and opt-in. 𝗡𝗲𝘅𝘁.𝗷𝘀 𝗗𝗲𝘃𝘁𝗼𝗼𝗹𝘀 𝗠𝗖𝗣: AI-powered Model Context Protocol for easier debugging and smart workflows. 𝗣𝗿𝗼𝘅𝘆 𝗠𝗶𝗱𝗱𝗹𝗲𝘄𝗮𝗿𝗲: Say goodbye to middleware.ts, welcome proxy.ts for clearer network boundaries. 𝗗𝗫 𝗨𝗽𝗴𝗿𝗮𝗱𝗲𝘀: Better logs, simplified create-next-app, improved CLI, more transparent build metrics. 𝗧𝘂𝗿𝗯𝗼𝗽𝗮𝗰𝗸 (𝗦𝘁𝗮𝗯𝗹𝗲): Now default – get 2-5x faster builds, up to 10x faster Fast Refresh. 𝗕𝘂𝗶𝗹𝘁-𝗶𝗻 𝗥𝗲𝗮𝗰𝘁 𝗖𝗼𝗺𝗽𝗶𝗹𝗲𝗿: Automatic memoization with zero code changes; just turn it on! 𝗘𝗻𝗵𝗮𝗻𝗰𝗲𝗱 𝗥𝗼𝘂𝘁𝗶𝗻𝗴: Faster navigation, layout deduplication, and incremental prefetching. 𝗨𝗽𝗴𝗿𝗮𝗱𝗲𝗱 𝗖𝗮𝗰𝗵𝗶𝗻𝗴 𝗔𝗣𝗜𝘀: Use revalidateTag() with new profiles and the new updateTag() and refresh() APIs. 𝗦𝘂𝗽𝗽𝗼𝗿𝘁𝘀 𝗥𝗲𝗮𝗰𝘁 𝟭𝟵.𝟮: Enjoy view transitions, new hooks, and experimental features. 𝗦𝗶𝗺𝗽𝗹𝗲𝗿 𝗠𝗶𝗴𝗿𝗮𝘁𝗶𝗼𝗻: Use the CLI to upgrade (npx @next/codemod@canary upgrade latest) or install manually. Minimum: Node.js 20.9+, TypeScript 5.1+, Chrome 111+, Edge/Firefox/Safari 111+ Many deprecated/removed APIs – see the doc for full migration details! Ready for faster, smarter apps? Try Next.js 16 today! #nextjs #webdevelopment #javascript #reactjs #frontend #opensource

🚀 Next.js 16 is here — and it changes everything. From Turbopack as the default bundler to smarter caching, routing, and React 19 support, this release redefines performance and developer experience. In my latest blog, I break down: ⚡ The biggest improvements in Next.js 16 🧠 How it differs from previous versions 🔧 What to know before upgrading 👉 Read it here: https://lnkd.in/d6TygZhB Whether you’re already using Next.js 15 or planning a new project, this is the guide to help you understand what’s changed and why it matters. #Nextjs #WebDevelopment #React #FullStack #JavaScript #Developer

I explored a simple way to boost performance in Next.js by using server side caching with cacheLife and it really helps when rendering components that do not need frequent updates. Even small optimizations like this can make your app feel faster and more efficient for users. Working with caching, data fetching, and component level improvements is becoming a core part of modern React and Next.js workflows. It is great to see how these tools keep evolving and making development smoother. #Nextjs #ReactJS #webdevelopment #javascript #frontend #fullstack #softwareengineering #MERNstack

React Optimization Hack: Dynamically Import Large Components with React.lazy() In large React applications, performance can sometimes take a hit due to the size of your components. One powerful way to optimize this is by using React.lazy() for dynamic imports. This allows you to load components only when they are needed, reducing the initial load time and improving user experience. Here’s how it works: -> React.lazy(): Dynamically imports components only when they're rendered, rather than bundling them upfront. -> Suspense: A wrapper component that lets you display a loading state while the dynamically imported component is being fetched. 💡 Best use case: Large, non-essential components that don’t need to be loaded immediately, like modals, charts, or complex data tables. 💬 Curious how you’re using React.lazy() in your apps? Or maybe you’ve run into any challenges? Drop your thoughts in the comments—I’d love to hear your experiences. #ReactJS #JavaScript #WebDevelopment #Frontend #MERN @Reactjs @WebDevelopment

 💠Browser Router in React BrowserRouter is a component from the react-router-dom library that enables client-side routing in React applications. It keeps your UI in sync with the URL in the browser without reloading the page. Think of it as the brain behind the scenes that listens to URL changes and renders the correct components accordingly. How BrowserRouter Works HTML5 History API: BrowserRouter uses the HTML5 history API (pushState, replaceState, popstate) to manipulate the browser’s URL. No Page Reloads: When you navigate to a new route, it updates the URL without causing a full page refresh, keeping your app smooth and fast. Nested Routing: BrowserRouter works perfectly with nested routes and dynamic parameters, allowing for complex routing structures. #ReactJS #ReactRouter #JavaScript #WebDevelopment #FrontendDevelopment #SPAs #SinglePageApplications

A Simple Guide to React’s 𝐮𝐬𝐞𝐄𝐟𝐟𝐞𝐜𝐭 Hook --> 𝐄𝐯𝐞𝐫 𝐰𝐨𝐧𝐝𝐞𝐫𝐞𝐝 𝐰𝐡𝐚𝐭 exactly 𝐮𝐬𝐞𝐄𝐟𝐟𝐞𝐜𝐭 does and why it’s so important? 𝐖𝐡𝐚𝐭 𝐢𝐬 𝐮𝐬𝐞𝐄𝐟𝐟𝐞𝐜𝐭? useEffect is a React Hook that lets you perform side effects in functional components — like fetching data, updating the DOM, or setting up event listeners. In simple words: it tells React to “𝐝𝐨 𝐬𝐨𝐦𝐞𝐭𝐡𝐢𝐧𝐠 𝐚𝐟𝐭𝐞𝐫 𝐫𝐞𝐧𝐝𝐞𝐫𝐢𝐧𝐠.” 𝐖𝐡𝐲 𝐝𝐨 𝐰𝐞 𝐮𝐬𝐞 𝐮𝐬𝐞𝐄𝐟𝐟𝐞𝐜𝐭? Because not everything in React is about 𝐫𝐞𝐧𝐝𝐞𝐫𝐢𝐧𝐠 𝐭𝐡𝐞 𝐔𝐈. Sometimes, your app needs to interact with the outside world — 𝐀𝐏𝐈𝐬, 𝐬𝐭𝐨𝐫𝐚𝐠𝐞, 𝐨𝐫 𝐞𝐯𝐞𝐧 𝐛𝐫𝐨𝐰𝐬𝐞𝐫 𝐞𝐯𝐞𝐧𝐭𝐬. useEffect helps you run that code after the component renders, without breaking the React flow. 𝐓𝐡𝐞 𝐏𝐨𝐰𝐞𝐫 𝐨𝐟 𝐮𝐬𝐞𝐄𝐟𝐟𝐞𝐜𝐭? It gives you full control over 𝐰𝐡𝐞𝐧 𝐚𝐧𝐝 𝐡𝐨𝐰 𝐨𝐟𝐭𝐞𝐧 𝐲𝐨𝐮𝐫 𝐞𝐟𝐟𝐞𝐜𝐭 𝐫𝐮𝐧𝐬. With the dependency array, you can decide: [ ] → run once [data] → run when data changes (no array) → run on every render Clean, predictable, and no infinite loops Follow [Akash Tolanur] for more such react contents #React #ReactJS #javaScript #frontend #WebDevelopment #ReactHooks

Next.js 15 — The Future of React Development Is Here! https://lnkd.in/gxNTXMhK Next.js 15 just dropped, and it’s a game changer for modern web apps. With improved React Server Components, faster routing, and better caching, performance is smoother than ever. 💡 What stands out: ✅ Simplified Data Fetching (bye-bye boilerplate) ✅ Turbopack’s insane build speeds ✅ Built-in SEO & Image Optimization ✅ Improved DX with Server Actions If you’re still using CRA or older frameworks — now’s the time to explore Next.js 15. It’s not just a framework anymore — it’s the complete React ecosystem. #NextJS #NextJS15 #ReactJS #ReactDeveloper #FrontendDeveloper #FrontendDevelopment #WebDevelopment #WebDev #JavaScript #JS #Coding #CodeNewbie #Developers #Programmers #SoftwareEngineering #SoftwareDeveloper #TechTrends #ModernWeb #UIUX #Performance #OpenSource #FullStackDevelopment #NextLevelCoding #DevCommunity

Stop "Window Is Not Defined" in Next.js (2025) The Server-Side Rendering Reality Check You're building a Next.js app. Everything works perfectly in development. Then you run npm run build and suddenly: ReferenceError: window is not defined This error occurs because Next.js pre-renders pages using the Node.js server, and in this server environment, we don't have access to browser-specific objects like window. It's not a bug—it's a fundamental difference between server and browser JavaScript execution. NEXT.JS EXECUTION FLOW: Server (Node.js) Client (Browser) ┌──────────────────┐ ┌──────────────────┐ │ ✗ No window │ │ ✓ window exists │ │ ✗ No document │ ────→ │ ✓ document exists│ │ ✗ No localStorage│ │ ✓ localStorage OK│ │ │ │ │ │ Pre-render HTML │ │ Hydration │ └──────────────────┘ └──────────────────┘ ↓ ↓ ReferenceError Everything works When Next.js pre-renders a page, https://lnkd.in/gYHzcSHd

Stop "Window Is Not Defined" in Next.js (2025) The Server-Side Rendering Reality Check You're building a Next.js app. Everything works perfectly in development. Then you run npm run build and suddenly: ReferenceError: window is not defined This error occurs because Next.js pre-renders pages using the Node.js server, and in this server environment, we don't have access to browser-specific objects like window. It's not a bug—it's a fundamental difference between server and browser JavaScript execution. NEXT.JS EXECUTION FLOW: Server (Node.js) Client (Browser) ┌──────────────────┐ ┌──────────────────┐ │ ✗ No window │ │ ✓ window exists │ │ ✗ No document │ ────→ │ ✓ document exists│ │ ✗ No localStorage│ │ ✓ localStorage OK│ │ │ │ │ │ Pre-render HTML │ │ Hydration │ └──────────────────┘ └──────────────────┘ ↓ ↓ ReferenceError Everything works When Next.js pre-renders a page, https://lnkd.in/gYHzcSHd