JavaScript

Node.js 24.22.0 (LTS)

Node.js 26.12.0 (Current)

Wednesday, October 21, 2026 Security Releases

Your line of business web does not need a framework

A new business app starts with a question: React, Vue or Angular? The question that rarely gets asked is whether it needs one at all. For a page that lists orders, edits a customer and shows a few figures, the browser…

One API for checkout form validation: IBAN, EU VAT, card numbers, postcodes

Every checkout or KYC form ends up re-implementing the same checksums: IBAN mod-97, the Luhn check for cards, a different VAT algorithm for each EU country, and postcode regexes. I bundled them behind one small API so…

Why Your FinTech App is Bleeding Money (And How TypeScript Ledger Invariants Will Save It)

Every software engineer eventually learns that writing CRUD applications is easy. You map user inputs to database rows, render dynamic views, and call it a day. But the moment you cross the threshold into FinTech…

Evolu's blind-relay sync, run through the same 8 offline-first failure modes

Evolu's blind-relay sync, run through the same 8 offline-first failure modes I keep a short checklist of the ways offline-first sync actually breaks in production. Eight items, in the order they bite. I already ran…

Unlocking the Power of Regex: From Basics to Mastery

Introduction Regular expressions (often abbreviated as regex or regexp) are a compact, powerful way to describe patterns in text. Whether you’re validating user input, scraping data, or performing complex…

Mastering Modern JavaScript: From ES2023 Features to Real‑World Patterns

Mastering Modern JavaScript: From ES2023 Features to Real‑World Patterns JavaScript has come a long way from its humble beginnings as a browser‑side scripting language. With the yearly release cadence of ECMAScript, the…

Company Base project

Ecommerce Payment Integration: Reconcile Stripe Payouts in Node.js

Ecommerce payment integration isn't finished when checkout works. It's finished when you can trace every Stripe payout back to the orders in your database, and anything that doesn't match gets sent to a person. If your…

I Built a DSCR Calculator in Vanilla JavaScript — Here's the Loan Math Nobody Explains

A while back I needed a DSCR calculator that wasn't buried under popups and didn't ask me to create an account before showing a single number. So I built one: a free, no-signup debt service coverage ratio calculator for…

Part 6: Quotient Filters - the Theory

In the previous articles of this series, we saw Bloom Filters, with restrictions on removing added values. Here we'll see Quotient Filters, which free the caller from those limits. Quotient Filters Bloom Filters answer…

Understanding Aspect Ratios in CSS and Canvas: Formulas, Responsive Rules, and Image Cropping

When building responsive image galleries, hero sections, or interactive media canvases, aspect ratio mismatches are among the common causes of Cumulative Layout Shift (CLS) and awkward visual cropping. A browser may not…

Vite+ 1.0 ships one command for the whole web toolchain

VoidZero, the company behind the Vite build tool, released Vite+ 1.0 on September 28, 2026. It is the first stable version of an all-in-one toolchain for web development. A single command, vp, manages the Node.js…

Event Loop: como JavaScript executa código assíncrono?

Analise o código abaixo: console.log("A"); setTimeout(() => console.log("B"), 0); Promise.resolve().then(() => console.log("C")); console.log("D"); Qual é a ordem? Se você pensou em A, B, C, D, faz sentido: é a ordem em…

"Make the import better" is not a task: a two-part template and a worked handoff

"Make the CSV import better" is a real kind of request. It shows up in a backlog after a few support tickets, and nobody can finish it. An engineer could rewrite the parser, add a preview screen, or support three more…

What AI crawlers are blind to: the text your JavaScript renders

I run a small property site. Four languages, plain HTML, no framework, no npm dependencies, hosted on Cloudflare Pages. I have spent my working life on copy and search, so I did the usual things: structured data,…

Why fetch Returns Promise {<pending>} in JavaScript

I stared at this exact console output longer than I want to admit: the fetch clearly worked, the response was right there, and my data was still undefined. If that's where you are, here's what's actually happening. You…

Cannot Read Properties of null (Reading ‘addEventListener’): The Fix

You add a button to your page, write the click code, open the browser, and nothing happens. The console says Uncaught TypeError: Cannot read properties of null (reading 'addEventListener'). An addEventListener null…