DevIdiot! - Developer News & Resources

The setTimeout Rabbit Hole

Building a schedulerDespite being single-threaded, JavaScript has concurrency as a first-class citizen. As a result, I can offload work by creating a scheduler. This scheduler allows me to leverage the JavaScript event loop to its fullest.class Scheduler { constructor() { this.tasks = []; } defer(task) { this.tasks.push(task); if (this.activeTimeout) return; this.activeTimeout = setTimeout(() => this.runNextTask(), 0); } runNextTask() { let task = this.tasks.splice(0

Ultrafast machine learning on FPGAs via Kolmogorov-Arnold Networks

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It Worked Locally! Why Your Deployed App Throws a 404 Error on Refresh

When I was in the beginning phase of my web development journey, I faced a highly frustrating issue: my web app worked perfectly fine locally, but the moment I deployed it, hitting the refresh button threw a nasty 404 Not Found error. The fix is usually just a few lines of configuration code in your root directory. But as developers, we shouldn't just patch bugs without understanding them. Let’s deep dive into why this happens. The Catch: Browsers Don't Speak ReactLet's look at a React appl

The Env Variable Name Was Gone From the Bundle. The Value Wasn't.

Exploiting a misused NEXT_PUBLIC_ environment variable in OopsSec Store to recover a payment secret embedded in the client JavaScript bundle.Environment variables prefixed with NEXT_PUBLIC_ in a Next.js project are substituted into the client JavaScript bundle at build time. The browser receives the literal value, which means any user can read it from the network panel or by searching the static chunks under /_next/static/chunks/. The OopsSec Store challenge stores a payment credential under tha

From Blank Terminal to Shipping a Real Client Project: My First Year of Coding

Exactly one year ago, my terminal was a blank slate. I started where almost everyone does , wrestling with HTML, CSS, and JavaScript, trying to understand the web pixel by pixel.What began as curiosity quickly turned into a full obsession. I went from building simple static pages to diving deep into full-stack development. Here’s what that intense first year of constant building, breaking things, and shipping real projects has looked like. The Leap into Modern FrameworksOnce vanilla JavaScr

Filtering bot and spam traffic out of your analytics

If your analytics counts bots, every number you make decisions on is inflated. Conversion looks worse than it is, traffic looks better than it is. Here is the layered filter we run at ingestion, cheapest checks first.Same traffic, with bots counted and with them filtered out:With bots (inflated):Bots filtered out (honest):I build this for Zenovay (web analytics). None of these checks is perfect alone, which is why they are layered. Layer 1: it never ran JavaScriptThe single most effective f

GPT-2: Too Dangerous To Release (2019)

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Vite Unified Toolchains IS Brilliant, But Is it Enough for Frontend 2026

Unified Toolchains Are Solving Yesterday's ProblemVite 8 is a huge engineering achievement.A unified stack built around:ViteRolldownOXCThis reduces inconsistencies and improves collaboration across layers.But I think we're asking the wrong question.The problem was never:"Which compiler should we use?"The problem was:"Why does the same application have multiple realities?"For years frontend developers have accepted:Development RealityBuild RealityCI RealityProduction RealityAnd then we act

We built a QR/NFC digital identity and attendance SaaS for Nigerian institutions — would love feedback

The ProblemNigerian schools, gyms, hospitals, and businesses still run on paper registers. Attendance gets faked. Records get lost. Parents have no idea if their child actually made it to class. Management makes decisions on data that simply doesn’t exist.Nobody was solving this for Africa. So we did.What We BuiltmSAC — mySmartAccessCard eliminates paper records completely. Every student, member, or staff gets a digital identity on their phone. They check in instantly. Admins see everything live

I built a local OSINT recon dashboard that goes deeper than just checking if a username exists

github.com/ic0e/OS-ReconMost people who've looked into OSINT tools have come across Sherlock or Maigret - you give them a username and they tell you where it exists across the web. They're useful, but they share the same limitation: they call an HTTP request, check the status code, return true or false, done.The problem is that the user is expected to check all the data, gather it and analyze it, using different tools & messy workflows. What it actually doesOS-Recon is a local recon das

The LD_DEBUG environment variable (2012)

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MythForge

Looking for a collaborator on a small AI storytelling projectI’m building MythForge — a platform that transforms real life experiences into mythological narratives using AI. Think: you describe a life challenge, the AI retells it as an epic Greek myth.About 50% done. Looking for someone to help finish it.Tech stack: React, PostgreSQL, Python, OpenAI APINo pay — just public credit and a cool portfolio project.DM me if interested! AI #python #react #openai #buildinpublic

What it feels like to work with Mythos

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PDF Operations Without Opening Adobe Acrobat

PDFs Don't Need to Be PainfulNeed to merge 5 PDFs into one? Split a 200-page document? Extract text from a scanned contract?Stop opening Adobe Acrobat and waiting 30 seconds for it to load:npx pdf-toolkit-pro merge doc1.pdf doc2.pdf doc3.pdf -o combined.pdfnpx pdf-toolkit-pro split thick.pdf --pages 1-50npx pdf-toolkit-pro extract text scanned.pdf -o extracted.txtnpx pdf-toolkit-pro info report.pdf FeaturesMerge: Combine multiple PDFs into oneSplit: Extract specific pages or rangesExt

Angular 21 vs Angular 22 — What Actually Changed?

Angular has been evolving fast, but the changes from Angular 21 → 22 aren’t about flashy features.They’re about refinement, performance, and clearer patterns.If you’re already on Angular 21, here’s what really matters before upgrading. 🚀 Big PictureArea Angular 21 Angular 22Reactivity Signals introduced & growing Signals become the default mindsetChange Detection Zone.js still common Strong push toward zonelessTemplates New control flow adopted Fully

PDF Operations Without Opening Adobe Acrobat

useMemo Hook in React

useMemo :The useMemo is designed to optimize performance by caching (memoizing) the result of a calculation between component re-renders.The useMemo Hook only runs when one of its dependencies update. syntax :const Value = useMemo(() => calculateValue(a, b), [a, b]);useMemo have two arguments one is Calculate Function and another one is dependency array. Example Code :function App() { const [count, setCount] = useState(0) const [arr, setArr] = useState([1, 2, 3, 4]) const s

Apple decided not to roll out Siri in EU after denied request for exemption

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Biff.core: system composition for Clojure web apps

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Building Poker Software: From Zero to Hero

Building poker software from "zero to hero" requires transitioning from a simple game loop to a distributed, event-driven, real-time multiplayer architecture. The journey involves mastering deterministic state machines, cryptographic RNG, low-latency networking, and rigorous security compliance. 1. Phase 1: The Core Engine (Determinism & Logic)The foundation is a pure, deterministic game engine. No networking, no UI, just logic. Architecture: Use a Functional Core, Imperative Shell pat