Preventing Stale Closures with useEffect in React

🚨 This React bug cost us a release once. Everything worked. Until users clicked too fast. function useAsyncQueue() { const queue = React.useRef(Promise.resolve()); return React.useCallback(<T,>(task: () => Promise<T>) => { const run = queue.current.then(task, task); queue.current = run.catch(() => {}); return run; }, []); } 🧠 Why this exists In real React apps: -Users click the same action multiple times -Requests race each other -Later responses overwrite earlier intent We saw: ❌ Double form submissions ❌ Out-of-order state updates ❌ Inconsistent UI after fast interactions This hook serializes async work. Only one task runs at a time — in order. ⚖️ The trade-off ❌ Less parallelism ❌ Requires intentional usage But you gain: ✅ Deterministic behavior ✅ No race conditions ✅ UI that matches user intent Senior engineering is about controlling concurrency, not hoping timing works out. #JavaScript #WebDevelopmen #FrontendTips #IntlAPI #CodeSmart#ReactJs #Frontend #FullStack #Developer #coding #components #WebDevelopment #CleanCode #DevTips #OneLiners #100DaysOfCode #JavaScript #LinkedInTechCommunity

HTTP Status Codes – Very Important for Frontend Developers If you work with React, APIs, or REST services, understanding HTTP status codes is a must. They help you: handle API responses correctly show proper UI messages debug issues faster 🟢 2xx – Success 200 → OK 201 → Created 🟡 4xx – Client Error 400 → Bad Request 401 → Unauthorized 403 → Forbidden 404 → Not Found 🔴 5xx – Server Error 500 → Internal Server Error 💡 In real React apps, status codes decide whether to show: Loader Error message Retry button Success UI Learning APIs step by step by building real projects GitHub: https://lnkd.in/gc5MvRYk #API #StatusCodes #FrontendDeveloper #ReactJS #WebDevelopment #RESTAPI #JavaScript #MERN #LearningByBuilding #CodingJourney

HTTP Status Codes – Very Important for Frontend Developers If you work with React, APIs, or REST services, understanding HTTP status codes is a must. They help you: handle API responses correctly show proper UI messages debug issues faster 🟢 2xx – Success 200 → OK 201 → Created 🟡 4xx – Client Error 400 → Bad Request 401 → Unauthorized 403 → Forbidden 404 → Not Found 🔴 5xx – Server Error 500 → Internal Server Error 💡 In real React apps, status codes decide whether to show: Loader Error message Retry button Success UI Learning APIs step by step by building real projects #API #StatusCodes #FrontendDeveloper #ReactJS #WebDevelopment #RESTAPI #JavaScript #MERN #LearningByBuilding #CodingJourney

🚀 Built a Password Generator using React! 🔐 I recently developed a Password Generator application using React that helps create strong and secure passwords with ease. ✨ Key Features: Adjust the length of the password Option to include numbers 🔢 Option to include special characters 🔣 Generates random and secure passwords instantly This project helped me strengthen my understanding of React state management, component logic, and UI interactions. 🔗 Live Demo: 👉 https://lnkd.in/gRAzf46w I’d love to hear your feedback or suggestions for improvement! #React #JavaScript #WebDevelopment #Frontend #Projects #Learning #PasswordGenerator #ReactJS

Props vs State in React 🎯 Hey React devs! 👋 Ever confused Props and State? Let me clear it up in 2 minutes. 🎁 PROPS = Gifts from Parents Props are like birthday gifts. Your parents give them, but you can't change what's inside! javascript function Child(props) { return <h1>Hello {props.name}</h1>; } function Parent() { return <Child name="Shreyas" />; } ✅ Come from OUTSIDE ✅ READ-ONLY (immutable) ✅ Display them, don't change them 🧠 STATE = Your Own Mood State is like your mood. YOU control it. YOU change it. javascript import { useState } from "react"; function Counter() { const [count, setCount] = useState(0); return ( <> <div>{count}</div> <button onClick={() => setCount(count + 1)}>+</button> </> ); } ✅ Lives INSIDE component ✅ MUTABLE (you can change it) ✅ Changing state → UI updates 🔥 THE ONE-LINER Props are passed TO a component. State lives INSIDE a component. 💡 TOGETHER (Most Common) javascript function Parent() { const [name, setName] = useState("Shreyas"); return <Child name={name} />; } function Child({ name }) { return <div>{name}</div>; } ↳ Parent: manages STATE ↳ Child: receives PROPS 🎯 REMEMBER Props = Instructions from your boss (can't change) State = Your coffee level (you control ☕) Found this helpful? 💙 Comment or share! #React #JavaScript #WebDevelopment #ReactJS #Programming #CodingTips #FrontendDevelopment

🔐 Auto Logout with JWT in React (Clean & Secure) This IDE view showcases a custom React hook, useAutoLogout, designed to automatically log users out when their JWT session expires. The hook works by: ⏱️ Decoding the JWT token to extract the exp (expiry time) 📐 Calculating the remaining session time in milliseconds 🧠 Setting a setTimeout that triggers logout() when the token expires 🧹 Cleaning up the timer using clearTimeout inside useEffect 🔁 Reacting instantly whenever the token or logout handler changes This pattern ensures: No stale sessions Better security Zero manual tracking of token expiry A simple hook, a powerful security upgrade. 💻✨ #ReactJS #JWT #WebSecurity #Frontend #JavaScript #Authentication #CleanCode #Developers

🚨 𝗔𝘃𝗼𝗶𝗱 𝗠𝗲𝗺𝗼𝗿𝘆 𝗟𝗲𝗮𝗸𝘀 𝗶𝗻 𝗥𝗲𝗮𝗰𝘁 𝘄𝗶𝘁𝗵 𝗔𝗯𝗼𝗿𝘁𝗖𝗼𝗻𝘁𝗿𝗼𝗹𝗹𝗲𝗿 If you’ve worked with React long enough, you’ve probably seen this warning 👇 𝘊𝘢𝘯'𝘵 𝘱𝘦𝘳𝘧𝘰𝘳𝘮 𝘢 𝘙𝘦𝘢𝘤𝘵 𝘴𝘵𝘢𝘵𝘦 𝘶𝘱𝘥𝘢𝘵𝘦 𝘰𝘯 𝘢𝘯 𝘶𝘯𝘮𝘰𝘶𝘯𝘵𝘦𝘥 𝘤𝘰𝘮𝘱𝘰𝘯𝘦𝘯𝘵. 𝘛𝘩𝘪𝘴 𝘪𝘴 𝘢 𝘯𝘰-𝘰𝘱, 𝘣𝘶𝘵 𝘪𝘵 𝘪𝘯𝘥𝘪𝘤𝘢𝘵𝘦𝘴 𝘢 𝘮𝘦𝘮𝘰𝘳𝘺 𝘭𝘦𝘢𝘬 𝘪𝘯 𝘺𝘰𝘶𝘳 𝘢𝘱𝘱𝘭𝘪𝘤𝘢𝘵𝘪𝘰𝘯. 𝘛𝘰 𝘧𝘪𝘹, 𝘤𝘢𝘯𝘤𝘦𝘭 𝘢𝘭𝘭 𝘴𝘶𝘣𝘴𝘤𝘳𝘪𝘱𝘵𝘪𝘰𝘯𝘴 𝘢𝘯𝘥 𝘢𝘴𝘺𝘯𝘤𝘩𝘳𝘰𝘯𝘰𝘶𝘴 𝘵𝘢𝘴𝘬𝘴 𝘪𝘯 𝘢 𝘶𝘴𝘦𝘌𝘧𝘧𝘦𝘤𝘵 𝘤𝘭𝘦𝘢𝘯𝘶𝘱 𝘧𝘶𝘯𝘤𝘵𝘪𝘰𝘯. 𝗧𝗵𝗶𝘀 𝘂𝘀𝘂𝗮𝗹𝗹𝘆 𝗵𝗮𝗽𝗽𝗲𝗻𝘀 𝘄𝗵𝗲𝗻: - A component makes an async network call(ex: using fetch/axios) - The user navigates away before the request completes(so component unmounts) - The response still tries to update state ➝ results in memory leak. 𝗘𝘅𝗮𝗺𝗽𝗹𝗲 𝗖𝗼𝗱𝗲 𝗖𝗮𝘂𝘀𝗶𝗻𝗴 𝗧𝗵𝗶𝘀 𝗣𝗿𝗼𝗯𝗹𝗲𝗺. useEffect(() => {  axios.get("https://lnkd.in/dPDzuJUa")   .then(res => setTodos(res.data)); }, []); -If the component unmounts before the API responds, setTodos still runs. ✅ 𝗧𝗵𝗲 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻: 𝗔𝗯𝗼𝗿𝘁𝗖𝗼𝗻𝘁𝗿𝗼𝗹𝗹𝗲𝗿 𝘊𝘢𝘯𝘤𝘦𝘭 𝘵𝘩𝘦 𝘳𝘦𝘲𝘶𝘦𝘴𝘵 𝘸𝘩𝘦𝘯 𝘵𝘩𝘦 𝘤𝘰𝘮𝘱𝘰𝘯𝘦𝘯𝘵 𝘶𝘯𝘮𝘰𝘶𝘯𝘵𝘴. 𝗘𝘅𝗮𝗺𝗽𝗹𝗲 𝗖𝗼𝗱𝗲 𝗢𝗳 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻: useEffect(() => {  const controller = new AbortController();  axios.get("https://lnkd.in/dPDzuJUa", {   signal: controller.signal,  })  .then(res => setTodos(res.data))  .catch(err => console.log(err));  return () => {   controller.abort();  }; }, []); 🔑 𝘞𝘩𝘺 𝘵𝘩𝘪𝘴 𝘮𝘢𝘵𝘵𝘦𝘳𝘴 1. Prevents memory leaks 2. Avoids unnecessary state updates 3. Improves performance & stability 4. Essential for real-world React apps 𝗜𝗳 𝘆𝗼𝘂’𝗿𝗲 𝗽𝗿𝗲𝗽𝗮𝗿𝗶𝗻𝗴 𝗳𝗼𝗿 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 / 𝗦𝗗𝗘 𝗶𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄𝘀, 𝘁𝗵𝗶𝘀 𝗶𝘀 𝗮 𝘃𝗲𝗿𝘆 𝗰𝗼𝗺𝗺𝗼𝗻 𝗱𝗶𝘀𝗰𝘂𝘀𝘀𝗶𝗼𝗻 𝘁𝗼𝗽𝗶𝗰. 𝗜𝗳 𝘁𝗵𝗶𝘀 𝗵𝗲𝗹𝗽𝗲𝗱 𝘆𝗼𝘂 𝗿𝗲𝘃𝗶𝘀𝗲 𝗼𝗿 𝗽𝗿𝗲𝗽𝗮𝗿𝗲 𝗳𝗼𝗿 𝗶𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄𝘀, 𝗽𝗹𝗲𝗮𝘀𝗲 𝗹𝗶𝗸𝗲 𝗮𝗻𝗱 𝗰𝗼𝗺𝗺𝗲𝗻𝘁 — 𝗶𝘁 𝗵𝗲𝗹𝗽𝘀 𝘁𝗵𝗲 𝗽𝗼𝘀𝘁 𝗿𝗲𝗮𝗰𝗵 𝗺𝗼𝗿𝗲 𝗹𝗲𝗮𝗿𝗻𝗲𝗿𝘀 🚀 #React #FrontendDevelopment #JavaScript #WebDevelopment #CleanCode #Performance #ReactHooks

🔍 TS vs JS in React 19: Which to Choose for Your Next Project? React 19 introduces powerful features like Server Components, Actions, and hooks (e.g., useOptimistic), but the choice between JS and TS impacts development. JavaScript (JS) in React 19: Pros: Quick setup, no compilation, flexible for prototyping. Great for small apps or rapid iteration. Cons: Runtime errors from type mismatches, harder refactoring, less IDE support. Use Case: Simple components, MVPs. Example: Basic hook usage. const Counter = () => {  const [count, setCount] = useState(0);  return <button onClick={() => setCount(count + 1)}>{count}</button>; }; TypeScript (TS) in React 19: Pros: Static typing catches errors early, excellent for Actions/Server Components (type-safe async), better autocomplete/refactoring. Cons: Steeper curve, compilation step, more boilerplate. Use Case: Large teams, complex apps. Example: Typed Action. 'use client'; import { useActionState } from 'react'; interface FormState { message: string; } async function submit(prev: FormState, data: FormData) {  'use server';  // Typed logic  return { message: 'Success' }; } const MyForm: React.FC = () => {  const [state, action] = useActionState(submit, { message: '' });  return <form action={action}>...</form>; }; Verdict: Start with JS for simplicity, switch to TS as complexity grows. React 19's features shine with TS for reliability. Which do you prefer in React 19? Share your experience! #React19 #TypeScript #JavaScript #WebDevelopment

📌 Improve 1% daily → Become a 10x React developer over time. . . 🏁 Final React Rule to Remember ------------------------------------ If your React code reads like a sentence, you’re doing it right. JSX should stay clean and readable. . . ❌ Bad React Code {user && user.isAdmin && user.isActive && ( <Dashboard /> )} --------------------------------- ✅ Clean React Code const canAccessDashboard = user?.isAdmin && user?.isActive; {canAccessDashboard && <Dashboard />} ✔ Cleaner JSX ✔ Logic easier to debug ✔ Better readability #ReactJS #JavaScript #CleanCode #LearnReact #CodingTips

⚛️ Modern React Hooks Every Developer Should Know React has evolved far beyond useState and useEffect. If you’re building scalable, high-performance, and server-ready applications, these hooks are essential 👇 #ReactJS #ReactHooks #FrontendEngineering #WebDevelopment #JavaScript #React19 #PerformanceOptimization #UIEngineering