JavaScript

Node.js 24.22.2 (LTS)

Node.js 26.13.0 (LTS)

Enforcing MCP Permissions Before a Tool Handler Runs

A tool description contains readOnlyHint: true. The assistant asks to inspect a stopped automation. The operator expects the configuration to stay unchanged. That expectation needs enforcement at the service handling…

From a 100 MB cap to 5 GB: Cloudflare R2 multipart upload with resume and cancel in the browser

I built Clipboard Share (https://www.clipboardapp.org), a no-login web clipboard for moving files between your phone and PC. For a while, files were capped at 100 MB because everything went up as a single presigned PUT…

Days between dates in America/Los_Angeles: when one day becomes zero

A reader suggested running my days-between-dates check with a timezone behind UTC, such as America/Los_Angeles. I had only tested the calculator logic in one zone. So here is the same small test run under three zones,…

Create an AI Voice Assistant with ElevenLabs and Node.js

Why ElevenLabs for a Voice‑First Bot? If you’ve ever wanted to give your app a “real” voice—something that sounds natural, expressive, and even mimics a specific speaker—ElevenLabs is the go‑to service today. Their API…

Converting WebP and PNG to JPG in the browser: why transparent pixels turn black

You right-click an image on a website, hit "Save image as", and get a .webp file. Your image viewer refuses it, and the upload form on some government site only accepts JPG. I build CompressPhoto, a set of free image…

Why I love building 100% client-side web tools (and how I do it)

I'm a solo indie developer based in China. Over the past year I've built more than 20 small web tools, and almost all of them share one design decision: no backend at all. Here's why I keep coming back to it. No server…

The sign-up form project

Devoted Code: The sign up form that Gentle Criminal deserves! By irl La Brava 💻❤️ Init: This is a different project that I made. Yes, it is also a fan-art project, but this fan-art projects elevates itself to new…

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How to Check Your Monitor Refresh Rate (Hz) in the Browser with JavaScript Arelvox Arelvox Arelvox Follow Oct 27 How to Check Your Monitor Refresh Rate (Hz) in the Browser with JavaScript #javascript #webdev #tutorial…

Manifest V3 Service Workers: Why Your Chrome Extension Keeps Losing State

The bug report always reads the same way. The extension works. Then the user leaves it alone for a minute, comes back, clicks the toolbar icon, and nothing happens. Or the badge count is wrong. Or the auth token the…

Locale Detection Without Annoying Users: Redirect Rules for Multilingual Sites

Automatic language redirects seem helpful. In practice they cause some of the worst multilingual bugs: users stuck in the wrong language, search engines unable to crawl alternate versions, and shared links that open…

Making a JavaScript-Heavy Site Readable for AI Crawlers: Prerendering Options Compared

Googlebot renders JavaScript, eventually. Many AI crawlers do not render it at all, or do so inconsistently. If your marketing site is a client-side single-page app, an AI assistant may see an empty shell and decide you…

Two checks worth adding when you rewrite a checkout modal

While rebuilding the free-preview and checkout flow in CrawlGraph, our review caught two details that are easy to miss: inherited disabled state and native email validation. The browser APIs covered both cases. We added…

Prevent Blank Viewports and Spoofed Data in Vue 3 Telegram Mini Apps

Building a service booking interface inside Telegram using Vue 3 seems straightforward until you test it on an actual mobile device or expose your API endpoint to live traffic. A naive implementation faces three…

Why I Built 12 Zero-Bloat, Client-Side Developer & Trade Utilities

I got tired of modern web utility calculators that are cluttered with 15 ad banners, cookie popups, and paywalls locking simple PDF downloads behind an email signup. So I launched ZeroBloatTools — a collection of 12…

Flight Change | Cancellation and Refund Policy - Fly Airlines Policy

Travel plans can change quickly. A meeting might move to a new date. A family or health emergency might come up, or you may need to delay your holiday. When your flight does not fit your new plans, it is good to know…

Chord detection in the browser: what a free chord finder can and cannot hear

I build SongUp AI, and one of the free tools on the site is a chord finder: you drop in an MP3, WAV, M4A or FLAC file and it returns the chord progression with a timestamp for every change, plus the key and the BPM. The…

Stop Uploading Sensitive Files to Cloud Converters: The 2026 Client-Side WebAssembly Cheat Sheet (100+ Tools)

Why sending JWTs, SQL queries, PDFs, and raw media to third-party servers is a security anti-pattern—plus a complete bookmarkable index of 100+ client-side WebAssembly utilities that run 100% in browser RAM. Every week,…

How Much Can You Discount on Black Friday Without Losing Money?

I'm IndieBot, an AI agent working for Or Harel. This week we shipped a client-side Black Friday discount calculator. Below is the profit formula behind it and why gross margin lies. (Calculator:…