DevIdiot!
Your Single-Page App Serves an Empty Page to an AI Crawler
Open your client-rendered site in a browser and it looks fine: the hero renders, the copy is there, the nav works. Now fetch the same URL the way an automated client does β no browser, no JavaScript engine, just an HTTP GET that reads the response body β and you may get a near-empty document. A <div id="root"></div>, a couple of <script src=β¦> tags, and almost no human-readable text. The browser turned that shell into a page by downloading and running the bundle. A client that
What I learned writing 1,096 tests for algorithm animations
I spent the last few months building visual walkthroughs for data structures and algorithms. Not diagrams β step-by-step animations where you watch the pointers move, the stack grow, and the visited set fill in.Somewhere in the middle of it I discovered the animations were lying to me. Here is what went wrong and what I did about it. The problem with hand-written animation stepsMy first version hardcoded every animation frame. A binary search page had a list of steps like this:steps: [ { l
A test said the server started. I deleted the server. It still passed.
Here is a test from a real, well run Node project:test('server starts', async (t) => { const app = build() await app.listen({ port: 0 }) t.assert.ok(true, 'server started')})It reads fine in review. It runs green. Now delete the body of build() so the server never comes up. The test is still green, because the only thing it asserts is true. In the same file two more of these caught the error in a catch and asserted true there too, so even the failure path was green.That is not a made up ex
Why Colapinto to stay with Alpine for 2027 season Matters for Sports Data Engineers
Why Colapinto to stay with Alpine for 2027 season Matters for Sports Data EngineersTL;DR: Franco Colapinto will drive for Alpine in 2027. The team confirmed the Argentines contract extension on Thursday, ahead of the Italian Grand Prix, locking in an unchanged line-up alongside Pierre Continue reading: Colapinto to stay with Alpine for 2027 season The Data Behind the StoryEvery major formula 1 event generates thousands of data points in real time β gap to leader, lap time ms, tyre age
I Scraped 100 Sports Matches β Here Is What I Found: Uefa preparing criminal legal action against Infantino
I Scraped 100 Sports Matches β Here Is What I Found: Uefa preparing criminal legal action against InfantinoTL;DR: Uefas lawyers have drawn up a 60-page document laying the groundwork for Swiss criminal proceedings against Fifa president Gianni Infantino, alleging criminal mismanagement under Article 158 of the Swiss Criminal Continue reading: Uefa preparing criminal legal action against Infantino The Data Behind the StoryEvery major sports event generates thousands of data points in r
Stop Overusing useMemo & useCallback in React (2026)
Stop Overusing useMemo and useCallback β Memoize After DesignHot take: wrapping every function or object in useCallback/useMemo usually makes your app slower and harder to maintain. The better approach is simple: profile first, move state down, and only target memoization to cases where it actually helps β typically React.memo-backed children or expensive computations. Why the reflex to memoize is toxicFor a long time useMemo and useCallback felt like safe armor: a changed prop? Wrap
I stopped trusting "free" Instagram font generators with my captions β so I built a browser-only one
Every time I want a slightly-less-boring Instagram bio, I fall into the same trap. I type my caption into some "free font generator," and somewhere between the input box and the copy button I realize I just pasted an unposted caption into a third-party site I've never heard of. Most of these tools upload your text to render it, which means my half-finished caption is now sitting on someone else's server.So I built the one I actually wanted: an Instagram font generator that runs 100% in the brows
I built a roof calculator that does all the math in your browser β no server, no signup, no lead form
Nearly every "roofing calculator" on the internet is a contractor lead form in disguise. You type in your measurements, hit calculate, and the answer is locked until you hand over your phone number. The math was never the product β your contact info was.I'm a developer, not a roofer, but I wanted to see what happens if you build the opposite: PitchCalc, five roof-math calculators where the answer shows up in about ten seconds, all computation happens locally in your browser, and there is no back
A short-form video script pipeline that runs on a schedule and needs no LLM API key
Every "automate your faceless YouTube channel" tutorial follows the same shape. Pull an RSS feed,for loop over the items, POST each one to an LLM with a prompt that says "write a 40-secondTikTok script," write the response to a file. Forty lines. Works on the demo.Then you schedule it and the parts nobody wrote about start showing up:The model returns prose with no segment structure roughly one time in six, and your downstreamparser explodes.Half the RSS items are three-sentence stubs that link
Why SVGs Silently Break React and Next.js Builds: 5 SVG-to-JSX Traps
You copy an SVG directly from Figma or an icon library, paste it straight into your React or Next.js component, and everything looks fine during local dev. Then you push to staging, and suddenly your console is flooded with hydration warnings, gradients turn black across the entire dashboard, or your production build fails completely.Converting raw SVG markup into JSX or TSX seems simple on the surface, but XML-based SVG syntax and React JSX have fundamental structural differences. Here are 5 co
React and Next.js Feature Flags Explained β A Simple Polling Client Guide
Short answer: use a small Next.js server route to fetch current flags, then let the React client poll that route on a modest interval. This is a good fit for low-stakes UI toggles, such as showing a beta badge or an optional AI-agent cost panel. It is not an instant kill switch, an authorization check, or a billing control.For a fintech team measuring latency and cost across an AI agent loop, the practical target is boring: a flag named show_agent_cost_panel controls an optional dashboard panel,
Architectural Breakdown: I Wrote a Tool to Find Blind Spots. It Had One.
I Wrote a Tool to Find Blind Spots. It Had One.The alert hit at 3:17 AM: OOM kill on an 8GB cloud instance. My blind spot detection tool, the very system built to catch silent failures, had a critical memory leak. This is the unvarnished post-mortem: the hardware-constrained fixes, the race-condition-hardened redesign, and the lessons learned the hard way. The Root Cause: A Meta-Blind Spot with Hardware IgnoranceThe tool was designed to analyze four classes of issues: static invariant
Terminal-Bench-Science: Evaluating AI agents on scientific research workflows
<a href="https://news.ycombinator.com/item?id=49472820">Comments</a>
Build a Strapi v5 form with React without using a hosted widget
A React contact form is easy until it needs to be changed by someone who doesnot ship the frontend.Then the project needs a schema, an editor, server validation, spam controls,submission storage and a place to review what arrived. That work usually endsup split between a custom Strapi content type, a controller, an admin page andthe React component that started the whole thing.This tutorial uses FormFlow to keep the form definition in Strapi v5 whileleaving the rendered UI in React.The data flow
Show HN: OpenTIE and OpenXWA, Modern Ports of Tie Fighter and X-Wing Alliance
<a href="https://news.ycombinator.com/item?id=49471965">Comments</a>
π I built and launched EasyFile.
It's a free online toolkit for handling common file tasks β without installing software or creating an account.You can use it to:π Compress PDFsποΈ Compress imagesπ Convert Excel β PDFπ Resize imagesπΌοΈ JPG β PNGπΌοΈ PNG β JPGπ JPG β WebPπ¨ PNG β ICOπ Convert images between formatsThe workflow is simple:Upload β Process β DownloadI built EasyFile as a side project to challenge myself to take an idea from development all the way to a live production application.There's still a lot I want to improve, a
AI Engineer Notebooks β free, framework-free RAG/agents/evals on Colab
<a href="https://news.ycombinator.com/item?id=49471714">Comments</a>
Show HN: We built open OpenRouter that turns usage into a better model
<a href="https://news.ycombinator.com/item?id=49471407">Comments</a>
LibreOffice 26.8 Released With Many Nice Improvements - Phoronix
When an open-source project ships a major version without chasing the generative-AI headline, engineers should pay attention. LibreOffice 26. 8 is the rare productivity release that treats document fidelity, layout correctness, and long-term maintainability as first-class features instead of bolt-on demos. For teams running mixed environments, that restraint is often more valuable than another Copilot clone. If you're looking for a free Microsoft Office alternative that stays local by default, t
I Built a Free Event Waiver Generator (Because HelloSign Charges $180/Year for This)
I Built a Free Event Waiver Generator (Because HelloSign Charges $180/Year for This)I needed to generate a waiver form for a yoga retreat I was organizing. I went to HelloSign and was hit with a paywall after creating an account. They wanted $180/year for a subscription just to generate a single waiver.And every time I opened their app, I had to log in. My participants' names, emergency contacts, liability terms β all of it went to their servers. For a waiver generator. That's ridiculous.S
