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I Built an AI-Powered Japanese Trade Law Compliance Checker as a Chrome Extension

Japan's Subcontracting Act (Toriteki-ho / 取引適正化促進法, commonly called 下請法) governs transactions between large businesses and their subcontractors. It mandates specific payment terms, required contract clauses, and prohibits certain business practices — and violations carry significant penalties from the Fair Trade Commission.The problem: compliance checking is tedious. Most small businesses and freelancers either don't know the rules or spend time manually cross-referencing contract documents agai

Complete Guide to Front-End Web Development with React (2026)

Introduction to Front-End DevelopmentFront-end web development is the foundation of every modern website and application. It focuses on designing and developing the user interface that people interact with directly. Using technologies like HTML, CSS, and JavaScript, developers create responsive, fast, and visually appealing digital experiences.In recent years, React has become one of the most widely used tools for building modern front-end applications due to its flexibility and performance.What

🚀 New Challenge: File Explorer

Build a recursive file explorer tree view, similar to the sidebar in VS Code.👉 https://www.reactchallenges.com/challenges/file-explorer 🧠 What you'll practiceManaging local state with useStateRecursive thinking in ReactRendering nested data structuresBuilding clean, composable componentsHandling UI state at scale 📂 The challengeYou’ll implement a tree view where:Folders can be expanded and collapsed independentlyEach node manages its own state (no global state)Nested folders are fully

How PP15.ONE became 14x faster than before

A few weeks ago, PP15.ONE was slow. Really slow.The main page took almost 13 seconds to load. The map screen took even longer. Google PageSpeed gave the main page a score of 53.After a focused performance pass, the same page now scores 92. Page load is under one second. The map loads in one second too.That is 14x faster, on the same infrastructure. No upgrade. Just better code.Here is what actually moved the needle.The biggest win was the map. The old version pulled tiles from one source over on

I Ranked AI SDKs by Supply Chain Risk. LangChain Lost.

I Ranked AI SDKs by Supply Chain Risk. LangChain Lost.OpenAI and Vercel AI score clean. Anthropic hides two CRITICAL deps. LangChain has six.The March 2026 LiteLLM supply chain attack followed a pattern that was visible beforehand: a single maintainer, millions of downloads, no organizational backing. The attack came via a backdoored Trivy GitHub Action in LiteLLM's CI pipeline. Behavioral signals were pointing at the risk before the incident happened.I built getcommit.dev to surface exact

Shopify Payments Are Simple, Until They Break

Shopify makes it easy to create an order.That is not the hard part.The hard part starts when the payment does not behave like a clean, instant, single-step event.A webhook arrives twice.A payment is delayed.The amount is slightly different.The order was already cancelled.The customer says they paid, but your system still shows pending.If your integration assumes:payment_received = order_paidit will probably work in testing.It will fail in production.The real challenge is not “how to accept a pay

Automating GPC: a cleaner way to handle opt-outs at scale

Most teams still treat user opt-outs as a workflow problem. They are actually a stream-processing problem.When a browser sends the Sec-GPC: 1 header (or sets the navigator.globalPrivacyControl property to true), your site has milliseconds to decide what tags fire, what cookies drop, and what data leaves your domain. Doing that by ticket is no longer realistic. The technical shiftModern consent stacks read GPC the moment a request hits your edge. The decision tree is small:if (navigator.glob

Phone Number Validation API — Carrier, Country & Line Type in One Call

Phone validation is one of those things every app needs but nobody wants to build.Regex catches syntax. It doesn't catch whether +79001234567 is Tele2 in Russia, or whether a number is landline vs mobile vs VoIP.Phone Validator Pro solves this with a single API call. What you get✅ Valid/invalid flag🌍 Country + country code📡 Carrier name📱 Line type: MOBILE / LANDLINE / VOIP🔢 E164, national, international format🕐 Timezones for the numberWorks for 200+ countries. Response under 100ms. Qui

I Built a Free TypeScript & React Quiz with 125 Questions – Test Your Real Skills

Hey devs,After spending a lot of time writing TypeScript code (and sometimes feeling more confident than I probably should), I decided to create something to help myself and others properly measure their TypeScript knowledge.So I built TS Quiz — a free interactive quiz platform focused on modern TypeScript and React + TypeScript. What’s inside?125 hand-crafted questions5 difficulty levels (Basic → Advanced)Topics include:Core TypeScript conceptsGenerics and Utility TypesConditional Types &a

Stop Rebuilding Multi-Step Forms in React (A Better Approach)

If you've built more than one multi-step form in React, you’ve probably noticed a pattern…Every time you need:Step navigation (next / back / jump)Validation per stepShared state across stepsConditional flows…and every time, you end up rewriting the same logic again.It’s not hard — just repetitive, messy, and error-prone. 🧠 The Real ProblemMost approaches fall into two extremes:Too basic → you manage everything manuallyToo opinionated → hard to customizeWhat I wanted was something in between

The Surprising Power of Code Reviews: Pull Requests That Saved My Project

IntroductionCode reviews. For many developers, they are a necessary evil — a box to check in the development process. However, I have come to appreciate them as a powerful tool for elevating code quality, fostering collaboration, and improving team dynamics. Today, I want to share my journey from viewing code reviews as a mundane task to recognizing their critical role in successful projects.Let me take you back to a project I led a few months ago. Our team was tasked with developing a com

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Realistic Ragdoll Physics in Three.js Matthias von Bargen Matthias von Bargen Matthias von Bargen

Calculator projects

May 25 2026Calculator projectsHTMLSCRIPTSTYLERESULT

Best 10 Vibe Coding Agency Companies Powering AI-Native Development in 2026

The Year Software Development Stopped Being a BottleneckSomething structurally changed in 2025.Before that year, shipping software meant hiring developers, writing requirements documents, running sprint cycles, waiting for QA, and hoping the result matched what the business actually needed three months after the conversation that started it.After that year, the equation changed.Andrej Karpathy coined the term vibe coding in February 2025. By March 2025 it was a Merriam-Webster trending exp

Google Chrome silently installs a 4 GB AI model on your device without consent

<a href="https://news.ycombinator.com/item?id=48019219">Comments</a>

Stop Using useEffect Like This: 5 Patterns That Are Silently Breaking Your React App

I was doing a code review for a colleague when I found it.The component had five useEffect hooks.No errors. No warnings in the console. The PM had signed off on it. It had been in production for three months.But there was a subtle bug that only showed up when the user navigated quickly between pages.Data would flash. State would reset. Sometimes the old user's name would appear for a split second before updating to the new one.Three hours later, we traced it back to a single misused useEffect.Th