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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…

Installed, but nothing shows": building an install check for a third-party widget

Any product that ships a <script> tag for customers to paste into their site gets the same support ticket: "I installed it, but nothing shows.…

Building Dashboards with React: A Practical Guide to Reusable Components and Data Visualization

Dashboards are often the first place users go when they want to understand what is happening in an application. Whether you are building an analytic…

Inline rendering with document.currentScript

Why AND(0, ?) is 0: three values, snapshots and memory in a logic simulator

In my last post I planned a feature, and executing it turned up a bug: the simulator could not hold a bit with two gates. The first circuit in every…

My first web project: 95 pages, 49 indexed, 0 visitors. What would you do (for free)?

This is my first web project, so please assume I know nothing. I'm learning in public and I'd love your recommendations. I built a solar savings cal…

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…

Create an AI Dubbing Tool for Video Content

Why Build Your Own AI Dubbing Tool? If you’ve ever needed to localize a video, add a narration track, or simply replace a shaky on‑camera voice, doi…

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…

Your TypeScript Is Lying to You, and These 5 Places Hide Real Bugs

TypeScript's most dangerous keyword is two letters long. as does not convert anything. It does not check anything. It tells the compiler "trust me",…

How to play Morse code in the browser with the Web Audio API

A Morse code player only needs a few pieces: an oscillator for the tone, a gain node to turn it on and off, and a schedule for the dots, dashes and…

PostHog's endpoints end in a slash and Next.js strips trailing slashes, so our analytics path is a negative lookahead

Here is a two line experiment you can run right now. Both of these are reverse proxies in front of PostHog, on two sites built by the same person, i…

How we compute session VWAP from 1-minute bars when the data feed does not give you one

Our stock app showed a "VWAP" number for every ticker. For a while that number was a lie. This is a short write-up of how we found out, and how we n…

Streaming LLM-Generated UI in React 19 with OpenUI Lang

Every generative UI demo I have shipped hits the same wall: the model emits a JSON component tree, and nothing paints until the closing brace arrive…

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…

The wappalyzer npm package is deprecated: options for detecting tech stacks in code

For years, npm install wappalyzer was how developers detected a website's technologies in code. The package's last release, 7.0.3 from August 2023,…

Building an AI-Powered WhatsApp Bot with Webhooks, CRM, and Real-Time Routing

Automating customer interactions on messaging channels has shifted dramatically over the past year. Traditional keyword-based decision tree bots are…

The Hidden Math of Etsy: Why I Ditched Spreadsheets for Code

I remember staring at my bank account after my first big month selling handmade candles on Etsy. I had made dozens of sales, but the deposit was way…

Using AutoClaws free GLM models usage from other sdks (opencode / claude code)

ive been maintaining this small opensource project GLM Proxy (glmproxy on npm) for a while and its finally on the level where im happy to share it o…

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…

Type-Safe Web Scraping for AI Agents: Integrating Firecrawl into a TypeScript Monorepo

Type-Safe Web Scraping for AI Agents: Integrating Firecrawl into a TypeScript Monorepo When building AI agents that need fresh web data, you hit two…

Is anyone still reading that thread? Check the author's last reply with 3 free APIs

When you answer someone's question on a forum, the date of the post tells you less than you think. A founder told me their replies stopped working a…

Merging PDFs in the browser: no server, no upload

Merging PDFs sounds like server work, but the PDF format is just a structured binary file — and libraries like pdf-lib can read and write it entirel…

Just shipped something I've been building for devs who work with AI coding agents:

Meet Loly Companion — an intelligent, non-intrusive desktop companion & floating notch interface. No more chaotic terminals. Loly sits on your d…

I'm 13. I Spent 101 Days Building a Secure Social Network with Node.js

Hey dev community! 👋🏻 I'm Seif, a software engineer with 4 years of experience who absolutely hates vibe-coding and prefers designing architecture b…

I Built a Chess Tool That Turns My Lost Games Into Personalized Puzzles

One thing I've noticed about improving at chess is that solving puzzles is useful, but learning from your own mistakes is important too. When I lose…

Карандашный набросок, который заливается акварелью: разбираю эффект на SVG без библиотек

Делал интерактивную открытку на день рождения и хотел, чтобы картинка не просто появлялась, а «рисовалась»: сначала карандашные линии, пот…

CrUX Now Counts SPA Soft Navigations. 5 Things I'd Check Before Search Console Switches

For years, the Chrome UX Report (CrUX) has had a blind spot. If your site is a single-page app, Chrome only recorded the first "hard" page load. Eve…