DevIdiot!

The VAD that saves STT billed minutes also silences tab audio

Streaming STT bills whatever audio actually leaves the browser. On microphone capture, a small RMS gate on the main thread drops silent chunks before they reach the socket. Point the same threshold at tab audio or a system loopback and the whole signal looks like silence, so the transcript dies. The gate therefore runs only for a mic. As soon as a system stream is mixed in, it is skipped, and the noise goes to the vendor.The capture path is the usual browser one: getUserMedia or getDisplayMedia,

The URL is the save file: a time card calculator with no backend and no accounts

Most time card calculators online fall into two groups. The old ones forget everything when you close the tab. The newer ones want an email address before they'll save a week of hours for you.For HourTotal I wanted a week of hours that survives a closed tab and can be sent to a manager, without anyone signing up for anything. So the whole time card lives in the URL. What goes in the linkA time card is small. It's five workdays with up to two punch pairs each, plus a name, a pay period, an o

Building a Netflix-Inspired Frontend with React

Building and Deploying a Netflix-Inspired React Landing Page on AWS S3 🎬☁️I recently finished building and deploying a Netflix-inspired frontend landing page using React.The project started as a way to practice React and frontend development, but I also wanted to take it one step further and actually put the finished application online using Amazon S3.So instead of keeping the project running only on localhost, I built the production version and deployed it as a live website using AWS S3.

Before you count a replication's null, plant the claim in its own data

In 1993 a one-page letter in Nature reported that 36 college students scored 3.56 standard-score points higher on Stanford-Binet spatial subtests after ten minutes of a Mozart sonata than after ten minutes of silence, and translated the music's advantage as 8 IQ-equivalent points over relaxation and 9 over silence. In 1999 Nature printed a three-laboratory replication that reported no improvement from the music in any of its experiments. Many tellings of the Mozart effect stop there: claim, repl

Building 2048 in JavaScript: One Merge Function, Four Directions

Build the sliding and merging logic, starting with a single row.Part of the Algorithms in JavaScript series.Take this row from a 2048 board:[2, 2, 4, 0]Slide it left. The result is:[4, 4, 0, 0]The first two tiles merge. The newly created 4 cannot merge again during the same move. If we keep merging until nothing else matches, we get the wrong board.When I rebuilt 2048, the movement logic was the part I wanted to focus on. The function needs to answer this:Given a board and a direction, compute t

React Hooks And useState

React HooksHooks are special functions in React that allow functional components to use React features such as state. Before hooks were introduced, state and other React features were mainly used with class components. Hooks made it possible to use these features inside functional components in a simpler way.A hook is usually a function that starts with the word use. Some commonly used hooks are useState, useEffect, and useContext. Each hook has a specific purpose. useState is used to stor

Telegram Mini App vs Bot for Crypto Swaps: Architecture Notes

If you're building a crypto swap flow inside Telegram, you have two interfaces to choose from: a bot (chat commands and inline buttons) or a Mini App (a web app rendered inside Telegram). Most production exchangers end up shipping both. Here's how they split the work, and the pitfalls that actually break swaps. When to use whichBotMini AppBest forStatus updates, quick repeat swaps, notificationsFirst-time swaps, pair search, address inputUIMessages + inline keyboardsFull HTML/JS UISearching

Building a Yes No Wheel: Why Streaks Look Rigged (and 3 Other Gotchas)

I added a Yes or No page to my NameWheelPro project. It's vanilla JS with zero dependencies, so every fix below works in any project.If you're building your own yes no wheel, here are four gotchas I'd want to know about up front.Streaks are normal, but they look like bugsSpin a fair 50/50 wheel and sooner or later you'll see Yes, Yes, Yes, Yes, Yes. Users will assume it's rigged. Don't "fix" it by preventing repeats, because that makes the tool less random. Prove it instead:function longestStrea

Publishing Rich-Text Blog Content to Payload CMS Programmatically (No Admin UI Required)

If you're running Payload CMS with the Lexical rich-text editor and you ever need to publish content programmatically — bulk-importing posts, scripting content from another source, or just automating your own publishing workflow — the admin UI isn't your only option. Payload's Local API lets you write directly to the database, including fully-formed Lexical rich-text fields, without touching a browser.Here's the pattern I've been using, and the gotchas that aren't obvious from the docs. The

I built a minimalist, dependency-free ecosystem for private AI using vanilla JavaScript

Hi Dev.to community! I'm JJDev, a self-taught developer. Recently, I became fascinated by the private AI ecosystem, but I noticed that many modern web tools are bloated with heavy frameworks and endless dependencies that slow down performance. So, I decided to build a solution from scratch: Ventarys AI. ⚡ What is Ventarys AI?Ventarys is a lightweight, open-source platform designed for developers and power users who want a private AI workspace without sacrificing speed or security. You can c

Introduction to React

What is React?React is a JavaScript library for building websites and apps. It was created by Meta (Facebook). Instead of writing one big messy page, you build small reusable pieces called components and snap them together.function Welcome() {return <h1> Hello, React </h1>;}Why Do We Use It?Before React, developers had to manually update the webpage every time something changed — which got messy fast. React makes this easier:Components – build once, reuse everywhereFast updates – Rea

Dynamic Abliteration: Non-Destructive Refusal Suppression via Engram Steering

<a href="https://news.ycombinator.com/item?id=49831201">Comments</a>

Unknown number of Texas voter registrations went unprocessed due to DPS error

<a href="https://news.ycombinator.com/item?id=49831175">Comments</a>

Best LLM for every budget, updated daily

<a href="https://news.ycombinator.com/item?id=49830866">Comments</a>

The <ExperienceSlot /> pattern: Decoupling marketing copy from React components

Every SaaS team starts the same way: a simple boolean column in PostgreSQL (has_seen_v2_modal), a useEffect hook, and a conditional modal component.Fast forward 6 months, and your frontend bundle is 80KB heavier with 14 dead announcement modals, 3 hydration race conditions, and marketing asking why the banner didn't trigger for trial users.Here is why hardcoding in-app experiences is an anti-pattern—and how to architect a deterministic, decoupled announcement engine in Next.js. The 3 Inevit

Virtual DOM in React

The Virtual DOM (Document Object Model) is one of the important concepts in React. It helps React update the user interface efficiently. What is Virtual DOM?The Virtual DOM is a lightweight JavaScript representation of the actual DOM.The actual DOM represents the elements on a webpage, such as headings, buttons, paragraphs, images, and forms.React does not directly update the entire actual DOM whenever something changes. Instead, it uses the Virtual DOM to find out what has changed. Ho

What "free" means when a data grid also sells a paid edition

Plenty of data grid libraries with a paid edition also have a free one, and the word "free" on their homepages covers several different deals. The license field in package.json does not settle it either. Ours says SEE LICENSE IN LICENSE, which tells you nothing until you open the file.We sell a grid, so we have a stake in this. I'll use our own licence as the worked example throughout, including the part where we got it wrong in public. Three things "free" can meanOpen source. MIT, Apache-2

Feeling Rusty on React? These 10 Free Problems Will Tell You Exactly What You Forgot

Been away from React for a while — new job, a break, switched stacks — and not sure where the rust actually is? Instead of re-reading docs, try solving these 10 problems. Each one isolates a single concept, runs real test cases in the browser, and takes 10–15 minutes. If you get stuck, that's the exact spot to go re-learn.1. Counter with ResetThe most basic hook there is — but "basic" is exactly where rust hides. Build a counter with increment, decrement, and a reset that actually resets to the

Cryptonex: A Free Cybersecurity Services Template

Introducing Cryptonex, a free multi-page website template built for cybersecurity service providers. This is a straightforward, functional starting point if you need to quickly put together a professional-looking site for security consulting, penetration testing, or managed security services. What's insideFive pre-built pages: Home, About, Services, Blog, and ContactClean, business-appropriate design with a dark theme suited to the industryFully responsive layout that works across devicesBa

AI Agent Best Practices 2026: A Practical Approach to Building Reliable AI Systems

Building an AI agent is more than connecting an LLM to a few APIs. A prototype may work with a handful of test prompts, but production agents need clear instructions, controlled tool access, error handling, testing, monitoring, and predictable workflows.For developers working with AI agents in 2026, the focus is shifting from simply making agents autonomous to making them reliable, observable, secure, and maintainable.## 1. Start With a Clearly Defined TaskOne of the most important AI agent best