Oluwapelumi Famakinde’s Post

🚀 𝐃𝐚𝐲 𝟐 – 𝐌𝐢𝐜𝐫𝐨𝐭𝐚𝐬𝐤𝐬 𝐯𝐬 𝐌𝐚𝐜𝐫𝐨𝐭𝐚𝐬𝐤𝐬 𝐢𝐧 𝐍𝐨𝐝𝐞.𝐣𝐬 ⚙️ 💚 Day 2 of my 15-Day Advanced Node.js Challenge! Yesterday, I explored how the Event Loop makes Node.js fast and non-blocking. Today, I went a step deeper — understanding the Microtask Queue and Macrotask Queue, the real reason behind how async code executes in Node.js 🔁 ❓ 𝐐𝐮𝐞𝐬𝐭𝐢𝐨𝐧: 𝐂𝐚𝐧 𝐲𝐨𝐮 𝐠𝐮𝐞𝐬𝐬 𝐭𝐡𝐞 𝐨𝐮𝐭𝐩𝐮𝐭 𝐨𝐟 𝐭𝐡𝐢𝐬 𝐜𝐨𝐝𝐞? 👇 𝐜𝐨𝐧𝐬𝐨𝐥𝐞.𝐥𝐨𝐠("𝐒𝐭𝐚𝐫𝐭"); 𝐬𝐞𝐭𝐓𝐢𝐦𝐞𝐨𝐮𝐭(() => 𝐜𝐨𝐧𝐬𝐨𝐥𝐞.𝐥𝐨𝐠("𝐌𝐚𝐜𝐫𝐨𝐭𝐚𝐬𝐤"), 𝟎); 𝐏𝐫𝐨𝐦𝐢𝐬𝐞.𝐫𝐞𝐬𝐨𝐥𝐯𝐞().𝐭𝐡𝐞𝐧(() => 𝐜𝐨𝐧𝐬𝐨𝐥𝐞.𝐥𝐨𝐠("𝐌𝐢𝐜𝐫𝐨𝐭𝐚𝐬𝐤")); 𝐜𝐨𝐧𝐬𝐨𝐥𝐞.𝐥𝐨𝐠("𝐄𝐧𝐝"); 🧠 𝐖𝐡𝐲? Node.js first executes all synchronous code (Start, End). Then it runs all Microtasks (Promises, process.nextTick). Finally, it executes Macrotasks (setTimeout, setImmediate). ⚙️ 𝐊𝐞𝐲 𝐭𝐚𝐤𝐞𝐚𝐰𝐚𝐲: Understanding the difference between microtasks and macrotasks is essential for debugging timing issues and writing efficient async logic. Master this, and you’ll never be confused by async behavior again 🚀 💬 𝐘𝐨𝐮𝐫 𝐓𝐮𝐫𝐧: Have you ever encountered async bugs due to the wrong task order? How did you solve them? Let’s share experiences below 👇 #NodeJS #BackendDeveloper #JavaScript #EventLoop #AsyncProgramming #LearningInPublic #CareerGrowth #15DaysChallenge #CodingJourney

Today, I fixed a bug that was haunting me for 2 days 😅 It was a state re-render issue in React that caused an infinite loop. After checking everything, I realized the dependency array in useEffect() was missing a key variable. Lesson? 🧠 Always understand how your component lifecycle works before blaming the backend! Solving bugs like this builds more than technical skills — it builds patience, focus, and confidence. That’s what real-world development is about — not just writing code, but understanding it deeply. #ProblemSolving #ReactJS #WebDevelopment #MERNStack #LearningByDoing #BheemaInfotech

"Why is this so hard?" That's what I asked myself at 2 AM while debugging OneSignal API calls for the 47th time. The existing NPM packages? Outdated. The documentation? Scattered. The errors? Cryptic. So I built onesignal-nestjs—the OneSignal wrapper I wish I had 6 months ago. 🎯 What makes it different? → Full TypeScript—your IDE becomes your best friend → Complete API coverage—push, email, SMS, Live Activities → 94%+ test coverage—it actually works → Production-ready error handling—helpful messages, not mysteries → Built FOR NestJS BY a NestJS developer I just published the complete tutorial—from zero to production in one guide: - Setting up in 5 minutes - Sending rich notifications with images & buttons - Multi-channel campaigns (push + email + SMS) - User segmentation & analytics - Real-world examples (e-commerce, social apps) - Common pitfalls & how to avoid them Because push notifications shouldn't be the hardest part of your backend. Read the full guide 👇 https://lnkd.in/eNtMvwEQ PS: It's open source. If it helps you, a ⭐ on GitHub would mean the world. And please feel free to contribute #JavaScript #TypeScript #NestJS #WebDevelopment #OpenSource #DeveloperTools

Ever got confused why a Promise executes before a setTimeout() in Node.js — even with 0ms delay? 😅 I recently created a detailed note on Microtasks and Macrotasks in Node.js that breaks down: ✅ How the Event Loop really works behind the scenes ✅ Difference between Microtask Queue and Macrotask Queue ✅ Node.js-specific phases (Timers, Poll, Check, Close) ✅ Code examples with clear execution order ✅ And even a simple real-world analogy to make it stick If you’ve ever struggled to understand async behavior or why your callbacks don’t run when expected — this guide is for you! ⚙️ Would love to hear your thoughts — what part of the Event Loop confuses you the most? #NodeJS #JavaScript #EventLoop #AsyncProgramming #WebDevelopment #Learning

💡 8 hours on a bug... that wasn't a bug. Here's a story from my early days as a front-end developer. My mentor gave me a challenge, he said me to fetch a user's live web location and trigger a popup if they move from their previous spot. Simple enough, right? I used the standard navigator.geolocation API to get the coordinates. I wrote the logic. I fetched the previous lat/long and compared it to the current lat/long. But the "You moved!" popup triggered every single time I switched browser tabs. I hadn't moved an inch. I spent 8 agonizing hours debugging. I console.log()-ed everything. I rewrote the comparison logic. I read the API docs over and over, convinced I was fundamentally misunderstanding something. My code looked right, but the result was wrong. After a full day of frustration, a random thought hit me: "What if it's not my code?" I disconnected from the office Wi-Fi and switched to my mobile hotspot. And just like that... the bug vanished. It worked perfectly. It was the Wi-Fi network. The fluctuations in the connection speed were causing the geolocation API to report slightly different coordinates, even when I was completely stationary. My code was correctly detecting this tiny "jump" as a "move." The bug wasn't in the code; it was in my assumption about the environment. When you're 100% sure your code is wrong, take a step back. The problem might be the network, the API, the environment, or a faulty assumption, not just the lines you wrote. That day was a frustrating, but an invaluable, lesson in debugging! What's a 'bug' you've chased for hours, only to find the problem was somewhere completely unexpected? Follow Mohamed Irfaan for more Front End content. Connect & DM for personalized mentorship and guidance for career growth. #webdevelopment #careergrowth #mentorship #reactjs #bugfree #softwaredevelopment #javascript #debugging #codingstory #developerlife

🚀 Little debugging win from today! While working on one of my recent Next.js tasks, I ran into an issue that had me scratching my head for a while my API base URL from the .env file kept coming up as undefined. After some digging, I realized that environment variables in Next.js aren’t automatically exposed to the browser. You have to prefix them properly to make them accessible at runtime. In my case, changing this 👇 const BASE_URL = process.env.API_BASE_URL ----> to this ----> const BASE_URL = process.env.NEXT_PUBLIC_API_BASE_URL Lesson learned: In Next.js, environment variables that need to be available on the client side must start with NEXT_PUBLIC_ (and for CRA projects, it’s REACT_APP_). A small fix, but a great reminder of how tiny details in configuration can make a big difference. #React #Nextjs #WebDevelopment #Debugging #DeveloperLife #LearningEveryday

💻 React Devs, ever noticed your production build folder is massive — or worse, your original source code appears in the browser’s DevTools? Here’s a simple yet powerful trick to fix that 👇 GENERATE_SOURCEMAP=false npm run build ✨ What this does: 🚀 Reduces build size 🔒 Keeps your source code secure (no readable code exposed) ⚡ Speeds up the build process ⚠️ A quick note: Avoid disabling source maps in development — it’ll make debugging much harder  💡But wait… what is a Source Map, anyway? 🤔 Think of it as a map that links your minified production code back to your original React files. It’s super useful for debugging — but in production, it’s often unnecessary (and risky). 👉 Have you tried disabling source maps before? Did you notice improvements in build speed or bundle size? Share your experience below 👇 #WebPerformance #ReactJS #CodeOptimization #BuildOptimization #FrontendDevelopment #DeveloperTips #TechCommunity

𝐒𝐦𝐚𝐥𝐥 𝐀𝐜𝐡𝐢𝐞𝐯𝐞𝐦𝐞𝐧𝐭𝐬 We've all had that mini heart-attack moment, right? You're about to push a new feature, and the cold sweat begins... "Did I leave an API key hardcoded in there?" 😱 I was in that exact spot last week, working on a React project juggling a dozen different APIs. The thought of manually cutting, pasting, and creating the ".𝑒𝑛𝑣" file was... well, let's just say it wasn't my idea of fun. Ufff. So, instead of a marathon of copy-pasting, I decided to code my way out of it. I'm excited to share the result: two new npm packages npm, Inc.! 💡 𝐞𝐧𝐯𝐚𝐥𝐲𝐳𝐞: This little tool automatically scans your project, finds all your secrets, and neatly pops them into a `.𝑒𝑛𝑣` file for you with option for backups! Security + Speed = Happy Developer. 🤔 𝐞𝐧𝐯-𝐟𝐚𝐮𝐥𝐭: Ever had your app crash because a variable was in your code but not your '.𝑒𝑛𝑣'? This one acts as a 'diff' checker, instantly showing you the difference between the variables your code expects and what your environment provides. No more guesswork! 🧑🏻💻 Just 𝘯𝘱𝘮 𝘪 𝘦𝘯𝘷𝘢𝘭𝘺𝘻𝘦 𝘦𝘯𝘷-𝘧𝘢𝘶𝘭𝘵 and see the magic. From a small annoyance to two developer tools. Hope they can save you some time too! 𝐋𝐢𝐧𝐤𝐬 𝐭𝐨 𝐛𝐨𝐭𝐡 𝐩𝐚𝐜𝐤𝐚𝐠𝐞𝐬 𝐚𝐫𝐞 𝐢𝐧 𝐭𝐡𝐞 𝐟𝐢𝐫𝐬𝐭 𝐜𝐨𝐦𝐦𝐞𝐧𝐭. What's the most mundane task you have faced so far? 👇 #DeveloperTools #NPM #JavaScript #ReactJS #NodeJS #OpenSource #Security #WebDevelopment

If you’ve ever tried setting a breakpoint in a NestJS project and wondered why it never stops where it should — you’re not alone 😅 I recently wrote a short guide on how to properly set up debugging for NestJS in WebStorm, step by step, with screenshots and explanations. It’s one of those small things that can save you hours once you set it up right. 👉 Check it out here: https://lnkd.in/dEwYKWg7 If you find it helpful, give it a ❤️ or leave a comment — I’d love to hear your thoughts and experiences!