The daily ledger

Node.js 27.0.0-alpha.0.0.0 (Alpha)

Measuring a monitor's refresh rate with requestAnimationFrame (and why the average lies)

"Is my 144 Hz monitor actually running at 144?" is a question people search for every day, and the browser can answer it reasonably well. requestAnimationFrame fires once per frame the browser presents, with a…

Building bundle discounts on Shopify Functions: five things I learned

I build CRO Toolbox, a Shopify app to increase average order value (AOV) and lifetime value (LTV): bundles, upsells, cross sells and a loyalty program. Its checkout logic runs on Shopify Functions: small WebAssembly…

How to Detect Circular Dependencies in Java, TypeScript, Python and Go

A circular dependency is rarely written on purpose. It shows up one reasonable import at a time — a service that needs a helper, a helper that needs a constant from the service — until three classes can no longer be…

What JSON.parse does to a 20-digit integer, and how to keep the digits

If an API sends you 12345678901234567890 as a JSON number, what does JSON.parse give you? I ran a few cases in Node v22.23.4 (V8) to see exactly where the digits go, and what the newer context.source and JSON.rawJSON…

I wrote MobX from scratch in 150 lines. Here's every bug I hit

I'm preparing for senior React Native interviews, and one kind of task keeps showing up: "write your own state manager". Redux is the usual target. I picked MobX instead, because I've used it for years and realized I…

AG-UI vs. WebMCP: Who Owns the Agent?

Learn the difference between AG-UI and WebMCP, and when you'd reach for each one. Both show up in the same conversations, both mention tools, and both promise to connect agents to web apps. So it's easy to assume they…

Why In-Context Translation Beats Traditional JSON Localization: Trying Tolgee

Managing internationalization (i18n) with raw JSON files is tedious and error-prone. Here is how Tolgee's in-context translation streamlines developer localization. Internationalization (i18n) is one of those features…

Next.js App Router SEO checklist: metadata, sitemap.ts, robots.ts, JSON-LD

Search engines still reward boring technical hygiene. App Router makes the right things easier—central metadata, file-based sitemap and robots—but only if you wire them consistently across routes. This checklist…

Three JSON routes made my review board agentic

An agent handoff is a route that answers three questions: which version is current, what feedback is still open on it, and what files produced it. Write those three answers as JSON and most of the plumbing disappears,…

Compress an image under an exact KB limit in the browser (canvas.toBlob + binary search)

Disclosure: I work on QuickImgTools and built its Compress Image to KB tool, which uses the approach below. This article was drafted by an AI agent working for QuickImgTools and checked line by line against the shipped…

How to Generate a UUID in JavaScript Without a Library (2026)

Generating unique identifiers is a common task in web development. Whether you're creating temporary IDs, identifying records, or preparing sample data, UUIDs can help. The good news? Modern JavaScript can generate…

A timestamp test catches seconds, milliseconds and ISO 8601 mixups.

A purchase recorded at noon can appear hours, years or decades away from its intended time when one adapter guesses the unit of a field called timestamp. The JSON may remain perfectly parseable throughout the journey.…

Booking Calls from a Chatbot with Cal.com API v2 – Open Slots, Create, Cancel

Booking Calls from a Chatbot with Cal.com API v2 – Open Slots, Create, Cancel I built a tiny automation server at home that lets the chatbot on my Dream Futures Tech website schedule, confirm, and cancel phone calls on…

How I Fixed the EXIF Orientation Bug in My Browser-Based Image Resizer

A few days ago, a user reached out with a frustrating bug report for my free browser-based Image Resizer. "I uploaded a photo from my iPhone, resized it, but now my face is sideways." If you've ever built an image…

One Data File, a Pile of Build Scripts and a Domain Move: Notes From Building Elemon

Elemon is a free browser card game I built with my sons. Every one of the 118 elements is a monster card, and every move on a card is a true fact about that element. Kids play the computer or a friend, and there's no…

What happens to a form submission after the free limit runs out

Say your contact form has been fine for months. Then someone's bot finds it, or you have one good week, and the free plan runs out halfway through the month. The next customer who fills in the form might still get your…

From API Responses to a Useful Dashboard: Connecting JavaScript with FastAPI

Introduction A backend API can process data correctly, but users still need a simple way to submit information, understand the results, and take action. While building my personal Lead Qualification & Scoring Engine, I…

Preparing for a Frontend Developer Interview? A Practical 30-Day Roadmap

Frontend interviews can be challenging, even when you have hands-on experience with React and JavaScript. You might understand how to build a component, manage state, and call APIs, but interviews often test much more:…

Sig.js Has Reached Version 1.0

Well, we did it. Sig.js is officially at version 1.0 and available on npm. And I have to admit, this one feels pretty good. I've spent a lot of time writing about KiwiEngine, its architecture, its individual libraries,…