Building a Browser-Based Line Break Remover with Local-First Text Processing
Removing line breaks looks like a one-regex job. text.replace(/\n/g, '') and you're done. Then real text shows up, and it turns out line endings are a…
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Alchemy: GJS UI Framwork
Gnome Application Framework I just added to Alchemy (GJS UI Framework) inspired by Quasar Framework and VueJS: QWebView (Native WebKit 6.0 integration…
What More Than Three Decades of Acrobat JavaScript Development Taught Me About Interactive PDF Forms
Interactive PDF forms are often treated as little more than electronic versions of paper documents. A user enters information, selects a few checkboxe…
Testing a Two-Chart Compatibility Engine Without Inventing Missing Data
A compatibility engine can be deterministic and still be dishonest. The obvious failure is a wrong calculation. The subtler failure is unjustified cer…
Nine Red Tests and No Way to Tell Which Ones Matter
Every SDET I know has a private ritual for the morning after a red nightly, and every one of them is embarrassed by it. Mine went like this. Open the …
Inside Instagram's DASH manifest — from MPD to segment to stitched MP4
The first surprise when you reverse-engineer an Instagram Reel download is that there's no single MP4 to fetch. There's an MPD file, separate video an…
When you actually need a headless browser (and when you're just wasting RAM)
Most of the store-locator scrapers I build never touch a browser. I open the Network tab, find the JSON endpoint the map calls, hit it with fetch , do…
Designing Branching Narratives in 5 Minutes: How I Built Two Narrative Browser Games
AI Disclosure: This article was written with AI assistance. All games mentioned were built using AI-assisted development tools. Why Narrative Games? T…
Building a Browser-Based Sentence Counter with Local-First Text Processing
Many text utilities are simple enough to run entirely in the browser. A sentence counter is a good example. The browser already has everything it need…
Why regex match highlighting breaks on nested capture groups (I found out the hard way building a tester)
I write enough regex that I got tired of bouncing between the browser console and random online testers just to check whether a pattern actually match…
PISCA: I turned an Andean breakfast soup into an interactive landscape
This is a submission for Frontend Challenge: Comfort Food Edition, Perfect Landing . What I built PISCA is an interactive, bilingual landing page abou…
It Was Just a Patch Update. What Could Possibly Go Wrong?
This is a submission for DEV's Summer Bug Smash: Smash Stories powered by Sentry . You know those version numbers in libraries and frameworks, right? …
React useUpdateEffect Hook: Skip the First Render (2026)
React useUpdateEffect Hook: Skip the First Render (2026) useEffect has no opinion about why it's running. Mount, update, doesn't matter — the callback…
Turns out my "random group splitter" doesn't roll any dice — here's what it does instead
A while back I wanted to build the classic "paste a list of names, get N even groups" tool — the kind of thing every teacher and event organizer has n…
Seven government recall feeds, and what it takes to make them agree
Every developed market publishes its product recalls. The EU has Safety Gate, France runs RappelConso on top of it, the US splits the job across the C…
Claude Fable 5 vs GPT-4o for TypeScript Codegen
Which model actually writes better TypeScript, and does it matter enough to change what you reach for? I ran Claude Fable 5 and GPT-4o through the sam…
Rock paper scissors is secretly a distributed systems problem
Back in 2023 I built an online rock paper scissors game so my friends and I could settle arguments remotely. Open a room, send the link, best of three…
Stop Faking Your Mock APIs: Introducing Playground API 🚀
If you’ve ever built a frontend prototype, mobile app, or design demo, you’ve likely run into this common headache: You connect your app to a mock RES…
How to Actually Unit-Test Google Apps Script (Vitest, Mocks & Clasp CI)
The bug that finally made me set up tests was a tax rounding error that quietly shipped wrong totals for two weeks. It lived in a plain function — no …
Unknown Time Is Not Noon: Modeling Missing Temporal Data Without Inventing Facts
Missing data is not the same thing as a convenient default. That sounds obvious, yet temporal software regularly converts an empty time field into mid…
Как не прерывать длинную задачу и удерживать правила в контексте Veai 5.16
ИИ‑агент редко ограничивается одним ответом, когда работает с большим проектом. Он читает код, ищет использования символов, м…
How to Remove Line Breaks from Copied PDF Text Without Destroying Paragraphs
Copying text from a PDF often produces something like this: The copied paragraph looks normal inside the PDF, but every visual line becomes a hard lin…
Building Form-Associated Custom Elements with ElementInternals
Web components have been able to fully participate in native HTML forms since 2023 — submit their value with FormData , trigger :invalid , reset along…
Part 3: The Angular Change Detection Mistakes That Make Large Apps Feel Slow
Part 3 of Angular in Production series When an Angular application is samll, change detection is something most developers rarely think about. And hon…
A Disabled Button Is Not Delivery: Build a Receipt-Based React Support Form
A user writes a detailed bug report, presses Send , and sees a disabled button. Then the request takes longer than expected. Did the report arrive? Sh…
How to Build a Profitable Chrome Extension in 2025
How to Build a Profitable Chrome Extension in 2025 tags: javascript, chrome, extension, money tags: javascript, chrome, extension, money How to Build …
Unicode Isn't a Font: How Fancy Text Generators Actually Work
If you've ever seen text like this: 𝓗𝓮𝓵𝓵𝓸 𝐇𝐞𝐥𝐥𝐨 𝕳𝖊𝖑𝖑𝖔 🅷🅴🅻🅻🅾 you've probably assumed it's using a custom font. It isn't. These styles are actually Unic…
I built a CLI to stop myself from committing API keys (and broken .env files)
The 11pm key rotation Two things have burned me more than once, and I suspect they've burned you too. Incident one: a deploy that went green in CI and…
Beyond APIs: The Architecture of Autonomous "Computer Use" Agents in TypeScript
The architecture of modern artificial intelligence has reached a critical inflection point. For years, Large Language Models (LLMs) operated as isolat…
Building SnipTools: A Client-Side, Privacy-Focused Developer Utility Suite
Hello community, We are Perception, a team of five second-year computer science students. Over the past few months, we noticed a recurring issue in ou…