Mastering `useMemo` and `useContext` in React for Performance

Day 99 of me reading random and basic but important dev topicsss.... Today I read about the Scaling Cancellations in JavaScript..... Yesterday, I read how to cancel a single fetch() request using AbortController to prevent memory leaks and UI bugs. But what if we're building a complex dashboard loading dozens of widgets simultaneously? Good news is AbortController is highly scalable.... You don’t need to instantiate a new controller for every single request. A single AbortController signal can be passed to multiple fetch calls. If the user hits "Cancel" or navigates away, calling controller.abort() once will instantly kill all associated network requests! const controller = new AbortController(); const urls = ['/api/users', '/api/analytics', '/api/settings']; // Map URLs to fetch promises, all sharing the same exact signal const fetchJobs = urls.map(url => fetch(url, { signal: controller.signal }) ); try { const results = await Promise.all(fetchJobs); console.log("All data loaded successfully!"); } catch (err) { if (err.name === 'AbortError') { console.log(" ALL parallel requests were aborted instantly!"); } } // Call this from anywhere in your app to cancel everything: // controller.abort(); Note: It's not just for fetch...... You don't have to limit yourself to network requests. AbortController is an elegant, universal event bus for cancellation. You can integrate it into your own custom asynchronous tasks. Since controller.signal emits a standard event, all you need to do is listen for the 'abort' event within your custom Promise: const ourCustomJob = new Promise((resolve, reject) => { // ... Heavy background task logic here ... // Tie your custom task to the same controller controller.signal.addEventListener('abort', () => { reject(new Error("Custom Job Aborted!")); }); }); // Now Promise.all([ ...fetchJobs, ourCustomJob ]) can ALL be managed together! By standardizing cancellation across your app using AbortController, you ensure clean garbage collection, eliminate race conditions, and drastically save your users' network bandwidth. Keep Learning!!!! #JavaScript #AsyncProgramming #WebDev #SoftwareEngineering #CleanCodee

🚀 Mastering APIs in React JS: Fetching Data & Fixing Bugs Like a Pro Working with APIs is one of the most important skills in React development. Whether you're building a dashboard, e-commerce site, or social app — fetching and managing data is at the core. 🔹 How to Fetch Data in React JS The most common way is using fetch() or libraries like axios. Example using fetch: import { useEffect, useState } from "react"; function App() { const [data, setData] = useState([]); useEffect(() => { fetch("https://lnkd.in/dKnZgEeR") .then((response) => response.json()) .then((data) => setData(data)) .catch((error) => console.error("Error:", error)); }, []); return ( <div> {data.map((item) => ( <p key={item.id}>{item.name}</p> ))} </div> ); } 🔹 Common API Bugs & How to Fix Them ✅ 1. CORS Errors Cause: Server blocking your request Fix: Use backend proxy or enable CORS on server ✅ 2. Infinite Re-renders Cause: Missing dependency array in useEffect Fix: Always use [] or proper dependencies ✅ 3. Undefined Data Errors Cause: Data not loaded yet Fix: Add conditional rendering (data && ...) ✅ 4. Incorrect API Response Handling Cause: Wrong data structure assumptions Fix: Always console.log() response first 🔹 Pro Tips 💡 Use async/await for cleaner code 💡 Handle loading & error states 💡 Use tools like Postman to test APIs 💡 Consider using React Query or SWR for better data fetching 🔥 APIs are the bridge between your frontend and real-world data. Master them, and your React skills instantly level up. #ReactJS #WebDevelopment #Frontend #JavaScript #API #Coding #Developers #TechTips

What is React Redux React Redux is a popular library used to manage the state of applications built with React.js. It is the official React binding for Redux, which is a predictable state management library for JavaScript applications. React Redux helps developers manage and share data across multiple components in a large application without passing props manually through many levels. In a normal React application, data is usually passed from parent components to child components using props. When the application becomes large, this process becomes complicated because many components may need the same data. This problem is known as prop drilling. React Redux solves this issue by providing a central store where the entire application state is stored. Core Concepts of React Redux 1. Store The store is the central place where the entire state of the application is kept. It is created using Redux's createStore or configureStore function. The store allows components to access the state and dispatch actions to change the state. 2. Actions Actions are simple JavaScript objects that describe what happened in the application. Each action has a type property and sometimes a payload that carries data. For example: { type: "ADD_TODO", payload: "Learn Redux" } 3. Reducers Reducers are functions that determine how the state changes in response to an action. They take the current state and the action as arguments and return a new updated state. Example: function todoReducer(state = [], action) { switch(action.type) { case "ADD_TODO": return [...state, action.payload]; default: return state; } } 4. Dispatch Dispatch is a function used to send actions to the Redux store. When an action is dispatched, the reducer processes it and updates the state. Example: dispatch({ type: "ADD_TODO", payload: "Learn Redux" }); 5. Provider React Redux provides a Provider component that makes the Redux store available to all components in the React application. Example: import { Provider } from "react-redux"; <Provider store={store}> <App /> </Provider> 6. useSelector and useDispatch React Redux provides hooks to interact with the store. useSelector – Used to access state from the Redux store. useDispatch – Used to dispatch actions. Example: const todos = useSelector(state => state.todos); const dispatch = useDispatch(); Advantages of React Redux Centralized state management Easy debugging with developer tools Predictable state updates Better scalability for large applications In modern React development, Redux Toolkit is often used with React Redux because it simplifies Redux configuration and reduces boilerplate code. React Redux is widely used in large-scale applications where managing state efficiently is important.

🚀 Fetch vs Axios in JavaScript When building modern web applications, interacting with APIs is a daily task. Two of the most commonly used tools for this are Fetch and Axios. 🔹 What is fetch()? Definition: fetch() is a built-in Web API in JavaScript used to make HTTP requests to servers and retrieve resources. 👉 It is promise-based and available in all modern browsers. 📌 How Fetch Works >> Sends a request to a server (GET, POST, etc.) >> Returns a Promise >> Resolves to a Response object >> You must extract data manually (e.g., .json()) 💻 Example async function fetchData() { try { const response = await fetch("https://lnkd.in/dQeGAVaB"); // Checking response status manually if (!response.ok) { throw new Error("HTTP error! Status: " + response.status); } // Convert response into JSON const data = await response.json(); console.log(data); } catch (error) { console.error("Fetch Error:", error); } } ⚠️ Important Characteristics of Fetch ✔️ Built into browser (no installation) ✔️ Returns Promise ✔️ Requires manual JSON parsing ✔️ Does NOT throw errors for HTTP failures (you must handle it) ✔️ Slightly more verbose 🔹 What is axios? Definition: axios is a third-party JavaScript library used to make HTTP requests from the browser or Node.js. 👉 It is also promise-based but provides many additional features out of the box. 📌 How Axios Works >> Sends HTTP requests (GET, POST, PUT, DELETE, etc.) >> Automatically transforms response into JSON >> Automatically throws errors for bad status codes >> Provides advanced configuration options 💻 Example import axios from "axios"; async function fetchData() { try { const response = await axios.get("https://lnkd.in/dQeGAVaB"); // Axios directly gives data console.log(response.data); } catch (error) { console.error("Axios Error:", error); } } ⚠️ Important Characteristics of Axios ✔️ Requires installation (npm install axios) ✔️ Automatic JSON transformation ✔️ Better error handling ✔️ Supports interceptors (modify request/response globally) ✔️ Supports timeout, cancellation, headers easily ✔️ Cleaner and shorter syntax 💡 When to Use Fetch vs Axios? 👉 Use Fetch when: >> You want a lightweight solution >> No external dependencies required >> Working on small/simple projects 👉 Use Axios when: >> You are building real-world applications >> Need better error handling >> Want features like: >>Interceptors, Global configuration, Request cancellation #JavaScript #WebDevelopment #Axios #FetchAPI #Frontend #Programming #Developers #Coding

> **Stop guessing where your files go. Here's the React folder structure every developer needs to know. 🗂️** > > After years of messy codebases, late-night debugging sessions, and onboarding nightmares — the secret to a scalable frontend isn't just your code. It's **how you organize it.** > > Here's what each folder does and why it matters: > 📡 **API** — All your backend connections in one place. No more hunting for fetch calls. > 🎨 **Assets** — Static files, images, fonts. Clean and centralized. > 🧩 **Components** — Reusable UI building blocks. Write once, use everywhere. > 🌐 **Context** — Global state without prop drilling chaos. > 📦 **Data** — Static JSON content and constants. > 🪝 **Hooks** — Custom logic extracted and reusable across the entire app. > 📄 **Pages** — One folder per route. Clean, readable, scalable. > 🔄 **Redux** — Advanced state management for complex apps. > ⚙️ **Services** — Business logic and frontend services, separated from UI. > 🛠️ **Utils** — Helper functions that every file in your app will thank you for. > > A well-structured project isn't a luxury — **it's what separates junior from senior developers.** > > Save this. Share it with your team. Your future self will thank you. 💾 > > --- > 💬 What does YOUR folder structure look like? Drop it in the comments 👇 --- `#ReactJS` `#FrontendDevelopment` `#WebDevelopment` `#JavaScript` `#CleanCode` `#SoftwareEngineering` `#Programming` `#React` `#CodeNewbie` `#100DaysOfCode` `#FolderStructure` `#TechTips` `#DeveloperLife` `#SoftwareDeveloper` `#LearnToCode` `#OpenSource` `#CodingTips` `#FullStackDeveloper` `#FrontendEngineer` `#UIUXDevelopment` --- **Why this will go viral:** - Opens with a **pain point** every developer feels - Uses **emojis** for scanability on mobile - Ends with a **call to action** (comment + share) that boosts LinkedIn's algorithm - Mix of **broad** (`#WebDevelopment`) and **niche** (`#FolderStructure`) hashtags for maximum reach

🚀 30 Days of JavaScript – Day 20 Today I upgraded my To-Do App with more advanced features. 💡 Project: Advanced To-Do App New features added: • Mark tasks as completed • Edit existing tasks • Delete tasks • Store data using localStorage 🧠 Concepts Used: • DOM manipulation • CRUD operations • local Storage • dynamic UI updates 📌 This project helped me understand how real applications manage and update data. 🎥 Demo below 👇 👉 Source code in (only JS Code). #JavaScript #FrontendDevelopment #WebDevelopment #LearningJavaScript #CodingJourney <script> let tasks = JSON.parse(localStorage.getItem("tasks")) || []; function showTasks() {   let list = document.getElementById("taskList");   list.innerHTML = "";   tasks.forEach((task, index) => {     let li = document.createElement("li");     let text = document.createElement("span");     text.innerText = task.name;     if (task.completed) {       text.classList.add("completed");     }     // actions     let actions = document.createElement("div");     actions.className = "actions";     // complete button     let completeBtn = document.createElement("button");     completeBtn.innerText = "✔";     completeBtn.onclick = function() {       toggleComplete(index);     };     // edit button     let editBtn = document.createElement("button");     editBtn.innerText = "Edit";     editBtn.onclick = function() {         editTask(index);     };     // delete button     let deleteBtn = document.createElement("button");     deleteBtn.innerText = "X";     deleteBtn.onclick = function() {       deleteTask(index);     };     actions.appendChild(completeBtn);     actions.appendChild(editBtn);     actions.appendChild(deleteBtn);     li.appendChild(text);     li.appendChild(actions);     list.appendChild(li);   }); } function addTask() {   let input = document.getElementById("taskInput");   if (input.value === "") {     alert("Enter task");     return;   }   tasks.push({ name: input.value, completed: false });   localStorage.setItem("tasks", JSON.stringify(tasks));   input.value = "";   showTasks(); } function deleteTask(index) {   tasks.splice(index, 1);   localStorage.setItem("tasks", JSON.stringify(tasks));   showTasks(); } function toggleComplete(index) {   tasks[index].completed = !tasks[index].completed;   localStorage.setItem("tasks", JSON.stringify(tasks));   showTasks(); } function editTask(index) {   let newTask = prompt("Edit your task:", tasks[index].name);   if (newTask !== null && newTask !== "") {     tasks[index].name = newTask;     localStorage.setItem("tasks", JSON.stringify(tasks));     showTasks();   } } showTasks(); </script>

> **Stop guessing where your files go. Here's the React folder structure every developer needs to know. 🗂️** > > After years of messy codebases, late-night debugging sessions, and onboarding nightmares — the secret to a scalable frontend isn't just your code. It's **how you organize it.** > > Here's what each folder does and why it matters: > 📡 **API** — All your backend connections in one place. No more hunting for fetch calls. > 🎨 **Assets** — Static files, images, fonts. Clean and centralized. > 🧩 **Components** — Reusable UI building blocks. Write once, use everywhere. > 🌐 **Context** — Global state without prop drilling chaos. > 📦 **Data** — Static JSON content and constants. > 🪝 **Hooks** — Custom logic extracted and reusable across the entire app. > 📄 **Pages** — One folder per route. Clean, readable, scalable. > 🔄 **Redux** — Advanced state management for complex apps. > ⚙️ **Services** — Business logic and frontend services, separated from UI. > 🛠️ **Utils** — Helper functions that every file in your app will thank you for. > > A well-structured project isn't a luxury — **it's what separates junior from senior developers.** > > Save this. Share it with your team. Your future self will thank you. 💾 > > --- > 💬 What does YOUR folder structure look like? Drop it in the comments 👇 --- **🔥 Hashtags:** `#ReactJS` `#FrontendDevelopment` `#WebDevelopment` `#JavaScript` `#CleanCode` `#SoftwareEngineering` `#Programming` `#React` `#CodeNewbie` `#100DaysOfCode` `#FolderStructure` `#TechTips` `#DeveloperLife` `#SoftwareDeveloper` `#LearnToCode` `#OpenSource` `#CodingTips` `#FullStackDeveloper` `#FrontendEngineer` `#UIUXDevelopment` --- **Why this will go viral:** - Opens with a **pain point** every developer feels - Uses **emojis** for scanability on mobile - Ends with a **call to action** (comment + share) that boosts LinkedIn's algorithm - Mix of **broad** (`#WebDevelopment`) and **niche** (`#FolderStructure`) hashtags for maximum reach

🚀 𝐖𝐡𝐲 𝐔𝐬𝐞 𝐄𝐱𝐩𝐫𝐞𝐬𝐬.𝐣𝐬 𝐖𝐡𝐞𝐧 𝐘𝐨𝐮 𝐂𝐚𝐧 𝐉𝐮𝐬𝐭 𝐔𝐬𝐞 𝐍𝐨𝐝𝐞.𝐣𝐬? If you're a developer stepping into backend development, you've probably asked this question: 👉 "𝐖𝐡𝐲 𝐝𝐨 𝐈 𝐧𝐞𝐞𝐝 𝐄𝐱𝐩𝐫𝐞𝐬𝐬.𝐣𝐬 𝐢𝐟 𝐈 𝐜𝐚𝐧 𝐛𝐮𝐢𝐥𝐝 𝐞𝐯𝐞𝐫𝐲𝐭𝐡𝐢𝐧𝐠 𝐮𝐬𝐢𝐧𝐠 𝐍𝐨𝐝𝐞.𝐣𝐬?" Let’s break it down in a simple and practical way. ⚙️ 𝐍𝐨𝐝𝐞.𝐣𝐬: 𝐓𝐡𝐞 𝐅𝐨𝐮𝐧𝐝𝐚𝐭𝐢𝐨𝐧 Node.js is a runtime environment that allows you to run JavaScript outside the browser. With Node.js alone, you can: - Create servers using the built-in http module - Handle requests and responses - Build full backend applications from scratch 💡 But here's the catch: 𝐢𝐭’𝐬 𝐥𝐨𝐰-𝐥𝐞𝐯𝐞𝐥 𝐚𝐧𝐝 𝐫𝐞𝐪𝐮𝐢𝐫𝐞𝐬 𝐦𝐨𝐫𝐞 𝐦𝐚𝐧𝐮𝐚𝐥 𝐰𝐨𝐫𝐤. 🚀 𝐄𝐱𝐩𝐫𝐞𝐬𝐬.𝐣𝐬: 𝐓𝐡𝐞 𝐒𝐦𝐚𝐫𝐭 𝐋𝐚𝐲𝐞𝐫 𝐨𝐧 𝐓𝐨𝐩 Express.js is a lightweight web framework built on top of Node.js that simplifies backend development. Instead of writing everything manually, Express helps you: - Handle routing easily - Manage middleware efficiently - Structure your application cleanly 🔥 𝐑𝐞𝐚𝐥 𝐃𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐜𝐞 (𝐒𝐢𝐦𝐩𝐥𝐞 𝐄𝐱𝐚𝐦𝐩𝐥𝐞) 👉 In Node.js (without Express): - You manually check URLs - Write repetitive boilerplate code - Handle headers, status codes, and parsing yourself 👉 In Express.js: - Clean routing like app.get('/users') - Built-in middleware support - Faster development with less code 🧠 𝐖𝐡𝐲 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫𝐬 𝐏𝐫𝐞𝐟𝐞𝐫 𝐄𝐱𝐩𝐫𝐞𝐬𝐬.𝐣𝐬 ✔ 𝐋𝐞𝐬𝐬 𝐁𝐨𝐢𝐥𝐞𝐫𝐩𝐥𝐚𝐭𝐞 Write minimal code and achieve more. ✔ 𝐁𝐞𝐭𝐭𝐞𝐫 𝐑𝐞𝐚𝐝𝐚𝐛𝐢𝐥𝐢𝐭𝐲 Cleaner and structured codebase. ✔ 𝐌𝐢𝐝𝐝𝐥𝐞𝐰𝐚𝐫𝐞 𝐒𝐮𝐩𝐩𝐨𝐫𝐭 Easily plug in features like authentication, logging, etc. ✔ 𝐒𝐜𝐚𝐥𝐚𝐛𝐢𝐥𝐢𝐭𝐲 Perfect for building real-world applications and APIs. ✔ Massive Ecosystem Thousands of ready-to-use packages available. ⚖️ 𝐒𝐨, 𝐒𝐡𝐨𝐮𝐥𝐝 𝐘𝐨𝐮 𝐒𝐭𝐨𝐩 𝐔𝐬𝐢𝐧𝐠 𝐍𝐨𝐝𝐞.𝐣𝐬 𝐀𝐥𝐨𝐧𝐞? Not at all. 👉 Think of it like this: 𝐍𝐨𝐝𝐞.𝐣𝐬 = 𝐄𝐧𝐠𝐢𝐧𝐞 🛠️ 𝐄𝐱𝐩𝐫𝐞𝐬𝐬.𝐣𝐬 = 𝐂𝐚𝐫 𝐁𝐨𝐝𝐲 + 𝐅𝐞𝐚𝐭𝐮𝐫𝐞𝐬 🚗 You can build a car engine from scratch… But Express helps you build a complete vehicle faster and smarter. 💡 𝐅𝐢𝐧𝐚𝐥 𝐓𝐡𝐨𝐮𝐠𝐡𝐭𝐬 If your goal is: Learning core concepts → Start with Node.js Building real-world apps → Use Express.js The best developers understand both — but 𝐜𝐡𝐨𝐨𝐬𝐞 𝐭𝐡𝐞 𝐫𝐢𝐠𝐡𝐭 𝐭𝐨𝐨𝐥 𝐟𝐨𝐫 𝐞𝐟𝐟𝐢𝐜𝐢𝐞𝐧𝐜𝐲. #NodeJS #ExpressJS #BackendDevelopment #WebDevelopment #JavaScript #FullStackDeveloper #SoftwareEngineering #Coding #Developers #TechCareer #LearningToCode #ProgrammingTips #LinkedInTech #CareerGrowth #DeveloperJourney

Right now, AI agents interact with your website by scraping HTML, guessing at DOM selectors, and breaking every time you push a redesign. That's not integration. That's duct tape. WebMCP is a W3C draft standard that flips this entirely. Instead of agents reverse-engineering your UI, your website declares typed tools—search, filter, and checkout—that agents call directly. Structured input in, structured output back. No scraping. No guessing. We just open-sourced the first comprehensive SDK to make any website WebMCP-ready. What's in the box: 12 npm packages covering core, React, Next.js, Vue, Angular, Svelte, and a plain script tag A CLI for testing and scanning A conformance suite aligned to the W3C spec An MCP-to-WebMCP bridge so existing AI toolchains work today The best part? Our own docs site dogfoods the SDK. Visit https://webmcpregistry.com and open DevTools—there are live tools you can inspect and call right now. The spec is still a draft (Chrome 146 Canary has the first implementation behind a flag). But the polyfill works in every browser today. Try it: npm install @webmcpregistry/core Star it: https://lnkd.in/gWFWGUhu #WebMCP #AIAgents #OpenSource #WebDevelopment #TypeScript #W3C #DeveloperTools