Raw HTML vs Rendered: A Quick Check of What Crawlers Actually Read on Your Homepage
Owners often ask why a search engine or an AI assistant describes their business strangely, or not at all. One common, boring cause: the words on th…
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I built a free, open-source platform with 180+ developer tools and 18 technical guides (Built with Astro)
Hey Dev community! I want to share a project I've been building: Th-Tech. It's a comprehensive, free, and open-source platform for developers. Why I…
Écrire un article sur les Web Workers en JavaScript
Debouncing vs. Throttling in JavaScript: How to Choose JavaScript interfaces often receive events faster than they need to perform useful work. A se…
Architecture Patterns for Custom Direct Booking Engines & Hospitality Web Apps
When building web applications for the hospitality sector—ranging from luxury boutique hotels to private villa rentals—developers often face a choic…
Don't feed the whole file to the AI: meet Sentinel-IR
description: "A free JavaScript package that turns a source file into a short, structural note for an LLM: what it touches, how risky it is, and whe…
Building a Production WhatsApp Cloud API Webhook in Node.js & Express
Connecting your backend to Meta's official WhatsApp Cloud API allows you to send automated transactional alerts, customer support messages, and inte…
Stop Using Random Card Numbers in Your Checkout Tests (Use These Instead)
When you build a checkout form, you need card numbers to test it. The usual shortcut is to type 4111 1111 1111 1111 or make up some digits. That wor…
Compare building a modern React CRUD application with REST versus GraphQL. Understand query shapes, state mutations, and implementation patterns
Whenever I start a new client project or evaluate an architecture for a team, I inevitably get asked the same question: "Should we build our fronten…
React Frontend Plus NodeJS Backend Error Capture for Tenant Cohort Incident Reconstruction
A thin correlation layer beats a large monitoring rollout when the immediate job is reconstructing which tenant cohort saw a fintech experiment fail…
I built my own roadmap. The first thing it found was that my SR latch didn't work.
Two posts ago I compared my logic simulator to nine others and listed three honest gaps. In the next one I opened the code and discovered that the t…
I built a free GitHub profile README generator with no badge APIs, no backend and a 3D contribution universe
README-Glassfolio turns your GitHub username into a themed profile README (banner, stats, heatmap, 3D universe, projects) as plain SVGs in your own…
Building a lo-fi tape + vinyl effect in plain TypeScript (no Web Audio graph, no WASM)
Most "lo-fi" browser effects are a Web Audio graph: a BiquadFilterNode , a WaveShaperNode , maybe a noise buffer. That's fine for a filter, but two…
JavaScript Design Patterns: Observer, Strategy, Proxy, Builder, Decorator, and Command
Design patterns are proven solutions to common programming problems. JavaScript's flexible nature lets you implement classic patterns cleanly, often…
Regex in Firefox: Named Groups, Unicode Support, and DevTools Debugging
Firefox's DevTools include regex testing capabilities, and Firefox's JavaScript engine has some regex-specific features worth knowing for developers…
Testing Security Headers in Firefox: CSP, HSTS, X-Frame-Options, and DevTools Debugging
Security headers are server-side HTTP headers that instruct browsers on security behavior. Firefox implements all the major ones. Here's a practical…
Firefox for Testing and Automation: geckodriver, Playwright, and CI Pipelines
Firefox is an excellent choice for automated testing and web scraping — it has official WebDriver support (geckodriver), a stable API, and unique fe…
Debugging Service Workers in Firefox: DevTools, about:debugging, and Common Issues
Service workers are a critical web platform feature — they enable offline capabilities, push notifications, and background sync. Firefox has full se…
Your screenshot tool is the leak — doing redaction entirely client-side
The most common way people redact a screenshot is still this: Take the screenshot. Search "blur image online". Upload it to the first result. Blur t…
Keep an import receipt beside the file fingerprint
A publishing tool can accept an import while its public output still needs checking. Keep a file fingerprint beside the acceptance receipt so the sa…
The Math Behind Weighted Grades, in Next.js
I built a free grade calculator with Next.js, and the part that surprised me most was how little of it is framework code. Nearly all of the logic is…
Live Sports Odds APIs: WebSocket vs REST, Latency and In-Play Feeds
This post first appeared on SportsAPIs.dev . What is a Live Sports Odds API? A live sports odds API (also called in-play or in-game betting API) pro…
Component Architecture & Design Systems
⚡ TL;DR: Kill the Button with thirty boolean props by favoring composition over configuration . Split presentational from container components, set…
Your rebuild will drop URLs. Google will tell you in six weeks.
A rebuild changes how pages are made. The old addresses stop existing without anyone deciding they should, and Google notices before you do. Here is…
Building a UK tax and pension calculator that shows its sources
The problem: one job title, four pay systems NHS pay looks like a single national table. It is not. Agenda for Change staff are paid under separate…
Building a browser metronome: schedule audio ahead of the UI clock
I'm building Pianory, a browser-based piano learning and practice app. One small feature has a useful implementation lesson: a metronome needs both…
When POST becomes GET: a redirect bug in a Node.js fetch wrapper
A POST followed a 302 redirect and became a GET. Its body disappeared, but its Content-Type header stayed behind. That showed up while extending the…
Beyond JSX: Modern Patterns for Building Scalable React Apps
Beyond JSX: Modern Patterns for Building Scalable React Apps React has been the go‑to library for front‑end development for nearly a decade, but the…
Technical SEO for Developers: From URL Architecture to Rendering and Indexing
A sitemap points to one URL. The page declares another as canonical. Internal links keep reinforcing a third version. You can change the SEO plugin…
EliteGrid 0.2.0: a modular TypeScript data grid (77 kB, zero deps, 32 features)
We've been building EliteGrid, a TypeScript data grid for React, Vue and plain JavaScript. 0.2.0 is out on npm today, launching as the Community edi…
Next.js 15 Support Ends Oct 21: The Upgrade Changes Your Build Won't Catch
TL;DR: Next.js 15 leaves its support window on 21 October 2026. Run the upgrade codemod and the separate next-async-request-api codemod, then test t…