Two Bugs That Taught Me More Than Any Tutorial
Introduction I'm Calvin, a backend engineering intern at HNG, currently wrapping up HNG14. This post is about two tasks from the internship that genui…
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How I Built an AI Journalist Discovery Engine with Octoparse MCP
Most people connect Octoparse MCP to their AI assistant and use it to extract a product list or pull some prices into a table. That's fine. But I want…
What Nobody Told Me About Maintaining an Open Source Project
I am a solo learner. I started coding last year with the help of AI and sometimes without any tutorials or courses. At first, I thought this journey w…
Why Retry Is One Of The Most Dangerous Keywords In Software
Few lines of code look more innocent than this: retry ( 3 ) It feels responsible. Professional. Resilient. After all, networks fail. Servers become un…
Idempotency Is More Important Than You Think
Most developers don't think about idempotency until production breaks. That's not because idempotency is an advanced concept. It's because everything …
How I Built a 24 Game Solver: Brute-Force Meets Elegance in TypeScript
The 24 Game is deceptively simple: given four numbers, combine them with + , - , × , ÷ to make exactly 24. Sounds easy, right? Try solving 1, 5, 5, 5 …
Merge multiple docs into one in Google Docs
Originally written for bulldo.gs — republished here with the canonical link pointing home. I want to programmatically combine several Google Docs into…
Import JSON from an API in Google Sheets
Originally written for bulldo.gs — republished here with the canonical link pointing home. I want to pull live JSON data from an API endpoint directly…
Send personalized emails from a sheet in Gmail
Originally written for bulldo.gs — republished here with the canonical link pointing home. I have a spreadsheet of names and email addresses and I wan…
Remove duplicate rows in Google Sheets
Originally written for bulldo.gs — republished here with the canonical link pointing home. I have a Google Sheet with duplicate rows and I want to rem…
Turing's Light — A Narrative Puzzle Game About Logic, Pride & Legacy
🎮 Play the Game 🔗 Live: https://turings-light.vercel.app 💻 Code: https://github.com/redwanshahriarshubho/turings-light 📹 Demo Video What I Built Turin…
HTML-First Websites Are Quietly Winning Again in 2026
TL;DR: HTML-first means shipping real, server-rendered content before any JavaScript runs, then adding scripts only where they earn their place. In 20…
The Best JavaScript Slider Library? Introducing Pagiflow: A Zero-Dependency, High-Performance Carousel
Have you ever noticed how quickly a web page's performance can drop when you add a slider or carousel? For years, web developers have had to choose be…
Web Security: OWASP Top 10 — Practical Defense Guide (2026)
Web Security: OWASP Top 10 — Practical Defense Guide (2026) Security vulnerabilities follow patterns. The OWASP Top 10 lists the most critical ones — …
Your package.json diffs are noisy for no reason. I built a zero-dep fixer.
Open a PR, and half the package.json diff is keys that didn't actually change — they just moved . One teammate's editor writes name at the top, npm in…
How to Build a Secure Serverless Port Scanner in Node.js (and Prevent SSRF)
Every network engineer and systems developer needs to verify connection ports. Whether you're debugging why a remote database connection is failing, c…
How ESLint Actually Works: The Quality Gate Behind Modern JavaScript
A few days ago, I shared an article: You Don't Need Another Agent. You Need a Linter. Then I did what I do with anything I write: shared it around — a…
ip-api.com vs ipify vs IPPubblico — which free IP API should you use in 2026?
ip-api.com vs ipify vs IPPubblico — which free IP API should you use in 2026? If you need a public IP detection or geolocation API for your project, t…
Introducing Joanium: An Open-Source AI Desktop App That Can Actually Get Things Done
AI assistants today live in browser tabs. You open one for writing, another for code, a third because it's better at research, and a fourth because yo…
How I Built a Property Matching System Using Euclidean Distance
Most accommodation platforms sort by price and star ratings. When I started building Voyera , a ski accommodation platform for Niseko, Japan, I wanted…
Summing 50,000 emission line items in the wrong order changes your total
Floating-point addition isn't associative. For a corporate inventory with tens of thousands of rows, naive summation drifts — and the number you discl…
Stop Declaring Tools Dead — lucide-react is Still Fine
Every few months, a post goes viral: "Please stop using [perfectly good tool]." This time it's lucide-react. And honestly? The take is lazy What's the…
Day 23 of Leaning MERN Stack
Hello Dev Community! 👋 It is officially Day 23 of my journey to master the MERN stack! Today, I wrapped up Lecture 8 of Apna College's JavaScript play…
Why Abstractions Leak
One of the most dangerous moments in a developer's career is when an abstraction works perfectly. Not because success is bad. But because perfect abst…
Why Math.random() is unsafe for passwords — and how to use crypto.getRandomValues instead
Why Math.random() Is Unsafe for Passwords — and How to Use crypto.getRandomValues Instead If you have ever written a password generator in JavaScript,…
22 Day of Learning MERN Stack
Hello Dev Community! 👋 It is officially Day 22 of my journey toward mastering the MERN stack! After learning how to create and style elements dynamica…
Sync State Across Browser Tabs: Master BroadcastChannel in React ⚡
The Cross-Tab Desync Problem In modern SaaS web environments at Smart Tech Devs, enterprise power-users frequently operate with multiple browser tabs …
Parallel AI Coding with Git Worktrees: Run Multiple Agents Without Conflicts
Parallel AI Coding with Git Worktrees: Run Multiple Agents Without Conflicts Most parallel AI development problems stem from a single architectural mi…
The Parcel That Taught Me Everything
Two months ago, my product manager walked up to my desk and said four words: "We need parcel delivery." I nodded confidently. Inside? I had no clue wh…
Why Your AI Side-Hustle Script Won't Run: 5 JavaScript Config Failures That Break Claude/OpenAI Tools (and How to Isolate Node v
If you've ever copied a working AI automation script, run node tool.js , and watched it die with Cannot use import statement outside a module or fetch…