most developers don't know why their async code breaks. they blame promises. they blame async/await. they blame the API. but the real problem is this : code snippet ! always check before you render. async code creates a gap between "i requested data" and "i have data." that gap will break you if you don't account for it. #javascript #reactjs #typescript #webdevelopment #buildinpublic
Exactly async bugs often come from ignoring loading and undefined states, not from async/await itself.
REST API Best Practices Every Dev Needs Building APIs that won't haunt you at 2AM 🔥 Here are 5 patterns that separate good devs from great ones: 1️⃣ Use nouns, not verbs — /users not /getUsers 2️⃣ Version your API — /api/v1/ saves future headaches 3️⃣ Plural resource names — /products not /product 4️⃣ Always HTTPS — never expose APIs over plain HTTP 5️⃣ Rate limit everything — protect from abuse And please… return the right status codes. 400 ≠ 500 🙏 A well-designed API is like a good joke — if you have to explain it, it's not that good. Save this for your next project! 🔖 #RestAPI #WebDevelopment #BackendDev #NodeJS #APIDesign #JavaScript #SoftwareEngineering #TechTips
most developers don't know array destructuring doesn't create new variables. they think it does. it doesn't. the problem: destructuring assigns to names. those names point to the same values. reassigning one doesn't break the original. confusion happens when you destructure and expect immutability. the rule: destructuring extracts values into new variable names. it doesn't link them. reassignment creates new local bindings. original data stays untouched. this is actually good. it prevents accidental mutations. #javascript #typescript #webdevelopment #buildinpublic #reactjs
Handle Async Code Like a Pro! ⚡ Tired of messy .then() chains? Async/Await is the modern way to write asynchronous code that looks and behaves like regular, synchronous code. It makes your backend and frontend logic significantly cleaner and easier to read. Here is a quick breakdown of how to master Async/Await. 🚀 #javascript #asyncawait #webdevelopment #backend
📌 Pyramid of Doom (Callback Hell) A situation where multiple asynchronous callbacks are nested inside each other, creating a pyramid-like structure. ❌ Hard to read and understand ❌ Difficult to debug ❌ Poor error handling ❌ Not scalable as the project grows ✅ Use **Promises** to flatten the structure ✅ Prefer **Async/Await** for cleaner, readable code ✅ Handle errors properly with try/catch Clean code isn’t optional — it’s what makes your backend scalable. 🚀 🔖 Save this for later #javascript #developer #architect #nodejs #mern #mmdanish
⚡ Part 6 of 10: React performance conversations often start too early. Someone sees a rerender and immediately reaches for memoization. But sometimes the real issue is simpler than that. Bad state shape. Too much work inside render. Unclear data flow. A component tree that grew without much intention. I’m not against optimization. I just think the better starting point is: What actually feels slow? Where’s the bottleneck? What problem are we solving? A lot of React code gets more complicated in the name of performance without actually getting better. Have you ever seen “performance optimization” make a codebase worse? #React #ReactPerformance #FrontendPerformance #JavaScript #TypeScript #SoftwareEngineering #WebPerformance
My search API was getting called 15+ times… for a single input 😅 Yes, seriously. Every time a user typed something, API was triggered on every keystroke. 💡 Example: User types: "react" 👉 r → API call 👉 re → API call 👉 rea → API call 👉 reac → API call 👉 react → API call ⚠️ This caused: • Too many unnecessary API calls • Slower performance • Bad user experience 💡 Then I fixed it using Debouncing Instead of calling API immediately, 👉 I waited for the user to stop typing 🧠 What I changed: Added a small delay (300–500ms) If user keeps typing → cancel previous call If user stops → then call API ✅ Result: • Reduced API calls significantly • Better performance • Smooth search experience 🔥 What I learned: Not every user action needs an instant API call. #ReactJS #FrontendDeveloper #JavaScript #CodingTips #WebDevelopment
💡React Tip💡 ⚡️Referencing Store Data Do Not Always Re-render The Component Most developers make this mistake when working with Zustand, thinking that the component will re-render. But it won't. This video is from my Mastering Zustand course. To learn more such tips and build 2 large applications from scratch, check out my zustand course. 𝗖𝗼𝘂𝗿𝘀𝗲 𝗟𝗶𝗻𝗸 𝗶𝘀 𝗶𝗻 𝘁𝗵𝗲 𝗰𝗼𝗺𝗺𝗲𝗻𝘁. #javascript #reactjs #zustand #redux #webdevelopment
Callbacks looked simple… until they didn’t. While revisiting Node.js async concepts, I finally understood why “callback hell” is such a big problem. Here’s the journey in 3 steps: 1️⃣ Callbacks Used to handle async tasks like file reading, APIs, timers 2️⃣ The Problem Nested callbacks → messy code → hard to debug 3️⃣ The Solution Promises → cleaner, chainable, more readable This small shift completely changed how I look at asynchronous code. Sometimes revisiting basics gives the biggest clarity. FAQs: Q: What is a callback? A: A function passed into another function to run after a task completes Q: Why is callback hell bad? A: It creates deeply nested code that is hard to read, debug, and maintain Q: How do Promises help? A: They allow chaining and make async code cleaner and more structured #NodeJS #JavaScript #BackendDevelopment #LearningInPublic
𝟵𝟵% 𝗼𝗳 𝗝𝗦 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿𝘀 𝘄𝗿𝗶𝘁𝗲 𝗮𝘀𝘆𝗻𝗰 𝗰𝗼𝗱𝗲 𝗱𝗮𝗶𝗹𝘆. 𝗕𝘂𝘁 𝗺𝗼𝘀𝘁 𝗰𝗮𝗻'𝘁 𝗲𝘅𝗽𝗹𝗮𝗶𝗻 𝘄𝗵𝘆 𝗶𝘁 𝗮𝗰𝘁𝘂𝗮𝗹𝗹𝘆 𝘄𝗼𝗿𝗸𝘀. 👇 I didn't either until I learned about the JavaScript Runtime Environment. Here's the mental model that changed everything for me: JavaScript by itself is just a language. Runtime = Engine + APIs + Event Loop 🔥 What's actually running under the hood: ⚙️ JS Engine (V8) → converts code to machine code 📞 Call Stack → runs functions one by one 🌐 Web APIs → setTimeout, DOM, fetch (NOT part of JS itself!) 📬 Callback Queue → stores async callbacks ⚡ Microtask Queue → Promises, higher priority 🔄 Event Loop → the brain connecting everything The flow: Code → Call Stack → Web APIs → Queue → Event Loop → Call Stack Right now, try this 👇 console.log("Start"); setTimeout(() => console.log("Async"), 0); console.log("End"); Output → Start, End, Async 🤯 Even with 0 ms delay, "Async" prints LAST. That's the Event Loop doing its job. 🧠 Interview tip: Q: Why can JS handle async if it's single-threaded? A: The Runtime provides Web APIs + Event Loop + Queues — not the language. If this helped, repost ♻️ to help another developer. Follow Amit Prasad for daily updates on JavaScript and DSA 🔔 💬 Comment: Did you know that setTimeout 0ms still runs last? #JavaScript #WebDevelopment #Frontend #NodeJS #100DaysOfCode #DSA #Developer #CodingLife #TechLearning
I spent months writing async Node.js code without really understanding it. Then a production bug taught me the event loop the hard way. Here's what you need to know: Node.js is single-threaded — but it handles thousands of concurrent requests without freezing. How? The event loop. It has 4 key parts: 1. Call Stack — Your sync code runs here, line by line. One thing at a time. 2. libuv Thread Pool — Async tasks (file I/O, HTTP requests) get offloaded here. Your code keeps running. 3. Microtask Queue — Promise callbacks live here. They run BEFORE anything else queued. 4. Macrotask Queue — setTimeout and setInterval callbacks wait here. This explains a classic JS gotcha: console.log('1') setTimeout(() => console.log('2'), 0) Promise.resolve().then(() => console.log('3')) console.log('4') Output: 1 → 4 → 3 → 2 The Promise fires before the setTimeout — even with a 0ms delay. Once you understand this, a whole category of async bugs just... disappears. What part of async JavaScript tripped you up most? Drop it below 👇 #NodeJS #JavaScript #WebDevelopment #SoftwareEngineering #FullStack
You can use optional chaining to guard against null, but relying on it alone just masks the real issue: handling async state properly.