Local Storage vs Session Storage vs Cookies for Frontend Devs

Day 3 - Frontend Diaries 👉 I thought forms are simple until I built one While working on login and signup components, my initial thinking was straightforward, just take input from user send it to the API and handle the response sounds simple, right ?? But when I actually started building the form, it turned out to be more than just inputs and a submit button ▪️ Managing input state properly ▪️ validating fields like email and password ▪️ showing meaningful error messages ▪️handling loading states while the request is in progress ▪️and dealing with failed responses Every small interaction needed to be handled It’s not just about collecting data it’s about guiding the user through the process That’s when it clicked, A form is not just about taking input it’s about handling every possible user action and responding to it correctly #frontenddevelopment #reactjs #webdevelopment #fullstackdeveloper #softwareengineering #buildinpublic #developers

📋𝙏𝙝𝙚 𝙢𝙤𝙨𝙩 𝙄𝙜𝙣𝙤𝙧𝙚𝙙 𝙥𝙖𝙧𝙩 𝙤𝙛 𝙍𝙚𝙖𝙘𝙩 𝙙𝙚𝙫𝙚𝙡𝙤𝙥𝙢𝙚𝙣𝙩: Effect Cleanups. We’ve all been there: you build a beautiful feature, it works perfectly in dev, but in production, users report "weird glitches" or "lag." Often, the culprit isn't your logic—it’s what you forgot to leave behind. In the world of React, we spend 𝟵𝟬% of our time worrying about how a component mounts and updates, but almost 0% on how it unmounts. This leads to one of the most silent killers in web apps: Race Conditions and Memory Leaks. 😵💫 𝗧𝗵𝗲 𝗣𝗿𝗼𝗯𝗹𝗲𝗺: The "Ghost" State Update Imagine a user clicks a profile, then quickly clicks another. Two API calls are sent. If the first one finishes after the second one, your UI will show the wrong user data. Why? Because you didn't tell React to "stop listening" to the first request. 🛠 𝙏𝙝𝙚 𝙎𝙤𝙡𝙪𝙩𝙞𝙤𝙣: 𝗔𝗯𝗼𝗿𝘁𝗖𝗼𝗻𝘁𝗿𝗼𝗹𝗹𝗲𝗿 🛡️ The AbortController is a built-in Web API that allows you to cancel asynchronous tasks (like fetch requests) when they are no longer needed. By using the cleanup function in useEffect, you ensure that if a component disappears or the dependency changes, the old "ghost" request is killed instantly. Why this matters for your career: 📈 𝙋𝙚𝙧𝙛𝙤𝙧𝙢𝙖𝙣𝙘𝙚: You aren't wasting bandwidth and CPU on data the user will never see. Stability: No more "Can't perform a React state update on an unmounted component" warnings. ✨ 𝙎𝙚𝙣𝙞𝙤𝙧𝙞𝙩𝙮: Understanding the lifecycle of side effects is what separates a junior dev from a senior engineer who builds scalable systems. #ReactJS #WebDevelopment #JavaScript #CodingTips #SoftwareEngineering #FrontendDeveloper #CleanCode #interviewprep

Full-stack development means handling everything — from frontend design to backend logic and databases. It combines technologies like HTML, CSS, JavaScript, APIs, and server-side programming to build complete systems. A full-stack developer can build, fix, and scale entire web applications efficiently. It’s not just coding — it’s about creating seamless, high-performing digital solutions. 🚀 Have a project or problem? Let’s talk. #FullStackDeveloper #WebDevelopment #ProblemSolver #WebSolutions #Frontend #Backend #Programming #Tech

“Frontend Developer = HTML, CSS, JavaScript…” This is what most people think. But frontend development is much more than just these three technologies 💻 Yes, they are the foundation. But real frontend development also involves: • Responsive Design (Flexbox, Grid) • CSS Frameworks (Bootstrap, Tailwind CSS) • JavaScript Concepts (ES6+, DOM, Events) • Version Control (Git & GitHub) • Package Managers (npm, yarn) • Build Tools (Vite, Webpack) • Frameworks & Libraries (React, Angular, Vue) • API Integration (fetch, axios) • Performance Optimization (lazy loading, code splitting) • Browser Developer Tools & Debugging • Accessibility (A11Y standards) 📌 Reality: Frontend is not just about making things look good — it’s about building fast, scalable, and user-friendly applications. Sharing this to give a clear picture of what frontend actually includes. If you're into frontend, what do you think is most important apart from HTML, CSS, and JavaScript? 🤔 #FrontendDevelopment #WebDevelopment #Developers #TechCommunity #BuildInPublic

Frontend System Design #6 🚀 🚨 Frontend devs are missing this… The browser is powerful But also dangerous It decides: • What runs • What gets blocked • What gets exposed If you don’t control it 👇 ❌ Data leaks ❌ XSS ❌ MITM attacks 💡 Fix = Control the browser • HSTS • Referrer-Policy • X-Content-Type-Options • Remove X-Powered-By Most devs ignore this Real devs don’t 👉 You’re not just building UI You’re controlling the runtime 📌 I broke this down into a simple carousel #Frontend #WebSecurity #SystemDesign #JavaScript #React #Developers

👉 Keeping writing your own code, it gives you an unique logic. Did you agree? For more information, you can visit here SANTHOSH KUMAR T Good Luck 🙂 #frontend #backend #fullstackdeveloper #developer #reactjs #javascript #softwareengineer #software #engineer #webapplication #web

🚀 Advanced JavaScript Problem Solved One common but critical issue I faced recently was handling duplicate user actions — especially when users click a button multiple times. This can lead to: • Duplicate API requests • Multiple form submissions • Even duplicate orders in real-world applications Not something you want in production. 💡 Solution: I implemented an Async Execution Lock System that ensures the action runs only once until the previous process is completed. This small logic can significantly improve: • Data integrity • Backend stability • User experience It’s one of those problems that looks simple on the surface, but if not handled properly, it can break real systems. I enjoy solving these kinds of edge-case problems and turning them into clean, reusable solutions. If you're working on similar challenges or building scalable web applications, let's connect and exchange ideas. #javascript #webdevelopment #problemsolving #frontend #fullstack #coding #developers #TamzidHosenShamim

Whether you are preparing for a technical interview or building modern web applications, mastering React.js is essential for frontend success. This checklist covers the core concepts from JSX and Hooks to State Management and Routing. 🔹 What's inside: ⠀⠀⠀⠀⠀⠀✔️ JSX Syntax Basics ⠀⠀⠀⠀⠀⠀✔️ Functional Components Logic ⠀⠀⠀⠀⠀⠀✔️ Props and State ⠀⠀⠀⠀⠀⠀✔️ UseState and UseEffect ⠀⠀⠀⠀⠀⠀✔️ Component Lifecycle Methods ⠀⠀⠀⠀⠀⠀✔️ Handling Events Efficiently ⠀⠀⠀⠀⠀⠀✔️ Conditional Rendering Techniques ⠀⠀⠀⠀⠀⠀✔️ Lists and Keys ⠀⠀⠀⠀⠀⠀✔️ React Router Basics ⠀⠀⠀⠀⠀⠀✔️ Context API Overview 💡 Logic over syntax: Understanding that State is private and fully controlled by the component, while Props are external and passed down, is the foundation of React's one-way data flow. 📌 Save this checklist for your next frontend project. 💬 Comment "REACT" if you want a deep dive into advanced Hooks! 🔁 Repost to help other developers build faster with React! 📌 All credit goes to the original creator of the material. Shared here for learning purposes only. #ReactJS #JavaScript #WebDevelopment #Frontend #Coding #ReactCheatsheet #SoftwareEngineering #Developers #100DaysOfCode #WebDev

🚀 Understanding Complete JWT Authentication Flow (Step-by-Step) If you're building modern web apps (MERN / Next.js / APIs), mastering JWT is essential. Here’s the full flow in a simple way: 🔐 1. User Login User sends credentials (email + password) to the server. 🧠 2. Server Validation Server verifies credentials from the database. 🪪 3. JWT Generation If valid, server creates a JWT token containing: - User ID - Role / permissions - Expiry time 🔑 Token is signed using a secret key. 📦 4. Token Sent to Client Server returns JWT to frontend (usually stored in): - HTTP-only cookies (recommended) - LocalStorage (less secure) 📡 5. Authenticated Requests Frontend sends JWT in headers: Authorization: Bearer <token> 🛡️ 6. Middleware Verification Backend middleware: - Verifies token signature - Checks expiration - Extracts user data ⚙️ 7. Access Control User is allowed/denied access based on role/permissions. 🔁 8. Token Expiry & Refresh - Access token expires (short life) - Refresh token generates new access token 💡 Pro Tips ✔ Use HTTP-only cookies for security ✔ Keep access tokens short-lived ✔ Implement refresh token rotation ✔ Never store sensitive data inside JWT 🔥 JWT makes your apps scalable, stateless, and production-ready. --- #JWT #Authentication #WebDevelopment #MERN #NextJS #NodeJS #FullStackDeveloper #SoftwareEngineering #API #Backend #ReactJS #Coding #Developers #Tech #100DaysOfCode #Programming #DevCommunity #LearnToCode #BuildInPubli

Your complete Web Development roadmap — 139 topics, 44 weeks, zero confusion. I mapped out every single thing you need to learn to become a job-ready web developer. In order. With free resources for each topic. Here's the path: Internet Fundamentals HTML CSS JavaScript Version Control & Tooling TypeScript React Next.js & Full-Stack React Backend Development Testing & Performance DevOps & Deployment No more "what should I learn next?" — this roadmap answers that question 139 times. Start here: https://lnkd.in/gHZGMcWs Save this. Share it with someone stuck in tutorial hell. #WebDevelopment #LearnToCode #Frontend #React #NextJS #JavaScript #CodingActivist #TechRoadmap #FullStack