React and Next.js: The Cost of Abstraction

Gen Z developers will never know the terror of the "JavaScript Triangle." 📐 If you started writing JavaScript in the last few years, you are living in luxury. You type await fetch() and the data just... appears. Magic. ✨ But some of us survived the Dark Ages of Node.js. The Old Way (Callback Hell): 🌀 Before async/await, or even Promises, if you wanted to do 3 things in a row (Find User -> Get Posts -> Get Comments), your code looked like a giant sideways pyramid. Code: JavaScript download content_copy expand_less getUser(id, function(user) {   getPosts(user.id, function(posts) {     getComments(posts[0].id, function(comments) {       // I am 4 levels deep and I want to cry     });   }); }); We called it the Pyramid of Doom. If you missed one single }); at the end, your entire app crashed, and you spent 3 hours playing "Find the missing bracket." Reading the code felt like trying to read a book sideways. The New Way (Async / Await): 🪄 Today, I wrote a complex API route for a client. Code: const user = await getUser(id); const posts = await getPosts(user.id); const comments = await getComments(posts[0].id); Straight down. Top to bottom. Like a normal human language. The Reality Check: We spend a lot of time complaining about the complexity of modern React, Next.js caching, or Node server actions. But we forget how much sanity modern syntax has given us. We used to fight the language; now the language works for us. Seniors: Do you still have PTSD from the Callback Hell days? 👇 Juniors: Have you ever actually written a nested callback? #JavaScript #WebDevelopment #NodeJS #ReactJS #Coding #TechHistory #SoftwareEngineering #DeveloperLife #Frontend #Backend

💡 Why React Hooks Don’t Work Inside Async Functions While building a Next.js project, I ran into an issue: React Hooks cannot be used inside async functions. React requires hooks to be called in the same order on every render, and async functions run outside the render flow, breaking this order. This can lead to errors like: • Rendered fewer hooks than expected • Rendered more hooks than expected The fix: I wrote a short PDF explaining this. 📕 Read it here: https://lnkd.in/daM9JR2j #React #NextJS #JavaScript #WebDevelopment

🚀 Getting Started with React: Intro, JSX & Key Features These 3 concepts are the foundation: React, JSX, and its core features. 1️⃣ What is React? React is a JavaScript library for building user interfaces, especially single-page applications (SPAs). Instead of manipulating the DOM manually, React lets us build UI using small reusable components. Example: function Welcome() { return <h1>Hello React</h1>; } Each component manages its own UI logic, making applications easier to build and maintain. 2️⃣ What is JSX? JSX stands for JavaScript XML. It allows us to write HTML-like syntax inside JavaScript, which makes UI code more readable. Example: const element = <h1>Hello World</h1>; Behind the scenes, JSX is converted to: React.createElement("h1", null, "Hello World"); So JSX is just syntactic sugar for JavaScript. 3️⃣ Key Features of React ✔ Component-Based Architecture Break UI into small reusable components. ✔ Virtual DOM React updates only the changed parts of the UI for better performance. ✔ Declarative UI Describe what the UI should look like based on the state. ✔ Reusable Components Write once, reuse anywhere. ✔ Strong Ecosystem Tools like routing, state management, and large community support. React focuses on building fast, scalable, and maintainable UI applications. #React #JavaScript #WebDevelopment #FrontendDevelopment #LearningByDoing

🧠 JavaScript is a "Brain" with no "Body." Most developers think console.log, setTimeout, and fetch are part of JavaScript. They aren't. 🤯 Standard JS (ECMAScript) is just a logic engine. It handles variables and loops, but it has no "voice"—it can’t talk to a screen or a network alone. To do anything real, it needs a Host Environment: 🌐 Browsers provide the "limbs" (DOM, Web APIs). ⚙️ Node.js provides the "muscles" (File System, HTTP). I just broke down the "Great JavaScript Identity Crisis" on my blog. Understanding this is the secret to mastering the Event Loop and async performance. Read the full breakdown here: 👇 https://lnkd.in/dSwe-qUb Thanks to Hitesh Choudhary Sir, Piyush Garg, Jay Kadlag #JavaScript #NodeJS #Backend #SoftwareArchitecture #Browser #webapi

JavaScript is one of the most widely used languages in web development, but many developers focus more on frameworks than on understanding its core concepts. Here are 3 JavaScript concepts every developer should truly understand: 1️⃣ Call Stack The call stack is how JavaScript keeps track of function execution. Understanding it helps you debug issues and know exactly how your code runs step by step. 2️⃣ Promises Promises make handling asynchronous operations much cleaner compared to traditional callbacks. They allow developers to manage tasks like API requests or database calls in a structured way. 3️⃣ Async / Await Async/await builds on promises and makes asynchronous code look and behave more like synchronous code, improving readability and maintainability. When developers understand these fundamentals, working with frameworks like React, Angular, or Node.js becomes much easier. Strong fundamentals always lead to better code. What JavaScript concept took you the longest to fully understand? #JavaScript #WebDevelopment #FrontendDevelopment #Coding #MERNStack

Unpopular Opinion: Junior Developers Should NOT Start With React This might sound controversial, but I see it often. Many beginners jump directly into frameworks like React or Next.js without understanding the problems those tools solve. Before React, you should understand: • How the DOM works • Event handling in JavaScript • State and data flow in vanilla JavaScript • Basic rendering logic Before using a framework, ask: Why was this framework created in the first place? React exists to solve problems like: Complex UI state management Efficient DOM updates (Virtual DOM & reconciliation) Component-based architecture Similarly, understanding concepts like Server-Side Rendering (SSR) makes frameworks like Next.js much easier to appreciate. The Same Applies to Styling Before using utility frameworks like Tailwind CSS, you should understand: Flexbox Grid Positioning The CSS box model Otherwise you end up copying classes without understanding layout behavior. The Real Point Frameworks are powerful. But they make far more sense when you understand the problems they were designed to solve. Strong fundamentals make learning any framework faster. Weak fundamentals make every framework confusing. Do you think beginners should start with fundamentals first, or jump straight into frameworks? #FrontendDeveloper #ReactJS #WebDevelopment #JavaScript #SoftwareEngineering #Developers #TechCareers

🚀 Day.js vs. Moment.js: The 2026 Shift Handling dates in JavaScript used to be a headache, and for years Moment.js was the "gold standard." But in modern development, performance and bundle size are no longer optional—they are requirements. Here is the breakdown of where we stand today: 🔴 Moment.js (The Legacy Powerhouse) Status: In maintenance mode (no new features/major changes). Pros: Feature-complete, highly familiar, and deeply embedded in legacy systems. Cons: * Heavyweight: Large bundle size (~67KB+). Mutable: Date objects can be changed accidentally, leading to tricky bugs. Not Tree-shakable: You get the whole library even if you only use one function. Verdict: Stick with it for existing legacy projects where migration cost outweighs the gain. 🟢 Day.js (The Modern Standard) Status: Actively maintained and the preferred choice for new builds. Pros: Ultra-lightweight: Only ~2KB for the core library. Immutable: Every operation returns a new instance—no more side-effect bugs. Plugin-based: Use the core for basics; pull in plugins for complex logic. Familiar API: Uses the same method chaining style as Moment, making migration easy. Verdict: The clear winner for new projects, especially in React, Angular, or Vue apps where performance is key. 💻 Side-by-Side Syntax The best part? You barely have to change your habits: JavaScript // Moment.js moment().format('MMMM D, YYYY'); // Day.js dayjs().format('MMMM D, YYYY'); 💡 The Final Word If you care about Faster Load Times and Scalable Architecture, it’s time to move to Day.js. Smaller bundles = happier users. #JavaScript #Frontend #WebDevelopment #Angular #ReactJS #NodeJS #WebPerformance #CodingTips

🚀 How does Node.js actually run JavaScript? JavaScript was originally designed to run inside browsers. So how did it become powerful enough to run servers and handle thousands of concurrent connections? I recently created a video where I deep dive into the internal architecture of Node.js and explain what happens behind the scenes when we run: "node index.js" watch here : https://lnkd.in/gSAm7Nha In this video, I cover: 🔹 Why Node.js was created 🔹 Why JavaScript was chosen for a server runtime 🔹 The role of the V8 Engine in executing JS 🔹 How libuv enables asynchronous I/O 🔹 The Thread Pool and how Node handles heavy tasks 🔹 A clear explanation of the Event Loop 🔹 How Node.js executes your JavaScript code step by step Understanding these concepts really changes the way you think about writing backend code in Node.js. Big thanks to my mentors Hitesh Choudhary Piyush Garg and TAs ( Akash Kadlag Jay Kadlag Suraj Kumar Jha , Anirudh Jwala and Nikhil sir ) from the Web Dev Cohort for their continuous guidance and support while learning these concepts. If you are learning Node.js or backend development, this video will help you understand what’s happening under the hood. I’d love to hear your feedback and suggestions for improving the explanation. 🙌 #NodeJS #JavaScript #BackendDevelopment #WebDevelopment #SystemDesign #LearnInPublic

In React, a reusable input component acts as a controlled wrapper around a native <input>. It takes props from its parent (like value, onChange, label and error) to keep data flow predictable and consistent. Here’s the key flow: - The parent form component manages the state (formeData, errors) - Each child component (e.g., input field) receives its value and event handler through props. -When a user types, the onChange event triggers a state update in the parent. This structure separates responsibilities where the form handles data and validation while the input handles display and interaction. Below diagram illustrates the controlled data flow loop in React forms. At the top, the parent component (form) holds the state, which serves as the single source of truth for the form data. The state’s value and an onChange handler are passed downward to the child component (<InputField>), which displays the value and triggers the onChange event when the user types. This event flows upward to the parent, asking it to update its state based on the user’s input. Once the state is updated, React rerenders the UI, sending the latest value back down to the input field, completing the loop. This continuous cycle ensures that the parent’s state always controls the form, keeping the interface predictable, consistent, and synchronized with user interactions. #react #frontend #javascript #reactjs #nextjs #software #webdevelopment

💡 React Tip: Use Custom Hooks to Reuse Logic One pattern I use frequently in React projects is custom hooks. Instead of repeating API logic across components, I move it into a reusable hook. Example 👇 function useFetch(url) { const [data, setData] = useState(null); useEffect(() => { fetch(url) .then(res => res.json()) .then(setData); }, [url]); return data; } Usage: const users = useFetch("/api/users"); Benefits: • Cleaner components • Reusable logic • Easier testing Custom hooks are one of the most powerful patterns in React. What’s your favourite custom hook? #ReactJS #FrontendDevelopment #JavaScript