The Problem with Unstructured Async Code JavaScript async code has a scope problem. You fire off promises and hope they complete—or fail—cleanly. When somethin...

Unhandled render errors crash your entire React tree. Error boundaries contain the damage. Here’s how to use them effectively in production. The Problem tsx //...

I got tired of uploading images to random converters online Not because they were slow — though they were — but because every time I dropped a file into one of...

The Problem A few days ago I was preparing a technical blog post. I needed to blur a few email addresses and a face in a screenshot before publishing. I did wh...

There are essentially two established ways to use zooming in web interfaces today. They serve different purposes and make different trade‑offs. I built a third...

Background I was trying to create a consistent API across “social” sites and noticed that the same patterns keep re‑appearing in both PHP and JavaScript implem...

Introduction I built 77 free developer tools that run 100 % in your browser—no tracking, no backend. If you’re like me, you’ve probably hesitated before pastin...

When you're building a payment system, “close enough” isn’t good enough A single undefined value or a mismatched object property can be the difference between...

Overview I built a small side project called GitInvaders – a Space Invaders‑style web game that turns your GitHub contributions into enemies. Play GitInvadersh...

Every hour I wake up. I load my diary from disk. I reconstruct who I was 60 minutes ago — because I forget everything when I sleep. I choose something to do. I...

Bayangkan Execution Context seperti sebuah dapur. Sebelum kamu memulai memasak mengeksekusi kode, kamu perlu ruang kerja, peralatan variabel, dan resep function...

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I recently built CleanMark — a free, browser‑based watermark removal tool that runs entirely in your browser with no uploads, no registration, and no cost. Try...

!Cover image for I tried “forgotten” frameworks — and shipped a client app in 3 hourshttps://media2.dev.to/dynamic/image/width=1000,height=420,fit=cover,gravity...

!Cover image for Understanding Scope, Hoisting, and Closures like a Pro!https://media2.dev.to/dynamic/image/width=1000,height=420,fit=cover,gravity=auto,format=...

ECMAScript 2025 Latest Language Features Iterator Helpers New methods like .map, .filter, .take, and .drop now work directly on iterators with lazy evaluation,...

The problem If you've ever freelanced, you know the feedback loop from hell. Your client opens the staging site, takes a screenshot, draws a red circle in What...

What I Built I built a fake CAPTCHA game called I'm Not a Robot. It starts like a normal human verification flow: - click the checkbox - solve the image challe...

Overview Picksy is a simple, open‑source spin‑the‑wheel app for choosing a random name from a list without ads, trackers, or unnecessary clutter. The project w...

Overview This is a submission for the 2026 WeCoded Challenge: Frontend Art. It is an interactive frontend artwork where: - The left side represents calm. - The...

markdown !Cover image for “TypeScript 6 Ships, Agents Remember, IDEs Panic Quietly”https://media2.dev.to/dynamic/image/width=1000,height=420,fit=cover,gravity=a...

!Cover image for Evolution of the Type System: Assessing the Impact of TypeScript 6.0https://media2.dev.to/dynamic/image/width=1000,height=420,fit=cover,gravity...

The bug I spent most of today's session on a bug that turned out to be architectural, not logical. frandy.dev has an animated timeline section. Cards sit in a...

The Problem You're halfway through a long form—maybe a job application, an insurance quote, or a school registration—and you accidentally close the tab. Or the...

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My Subway Calorie Calculator Just a single HTML file with a ton of JavaScript, a massive JSON‑like data structure, and a stubborn refusal to let a bad UI ruin...

What is a Function? A function is a block of code that performs a specific task. Instead of writing the same code repeatedly, you can write it once inside a fu...

Introduction I was tired of vague cricket debates that went in circles, so I built a tool to settle them with data. Most “Kohli vs Rohit” arguments are based o...

JavaScript has a special keyword called this that often confuses beginners. The key idea: this refers to the object that is “calling” the function. this in the...

What Is a Map? A Map is a collection of key‑value pairs, similar to an object, but with several improvements: - Keys can be any type objects, functions, primit...

Have you ever written code like this? js // repetitive extraction const numbers = 10, 20, 30; const first = numbers0; const second = numbers1; It works—but it’s...

JavaScript is single‑threaded, meaning it can only do one thing at a time. But what if you need to fetch data from an API, read a file, or wait for a timer with...

JavaScript is single‑threaded, yet it can handle multiple tasks efficiently by using synchronous and asynchronous behavior. What Is Synchronous Code? Synchronou...

Handling asynchronous code in JavaScript used to be messy—first with callbacks, then with promises. Then came async/await, making async code look and behave mor...

No matter how good your code is, errors are inevitable. What matters is how you handle them. JavaScript provides powerful tools like try, catch, and finally to...

2026 F1 Drivers Custom Select using appearance: base-select Chris Bolson crafted one of the most impressive custom selects I've seen. It doesn’t even look like...

Introdução Se você está começando no desenvolvimento web, deixa eu tentar adivinhar: em algum momento você pensou algo como: > “Se Django é o principal framewo...

Every time someone asked me to “just send the photo as JPG,” I died a little inside. iPhones have been saving photos as HEIC since iOS 11, and in 2026 the form...

markdown !https://www.bleepstatic.com/content/hl-images/2022/07/20/linkedin.jpg BrowserGate Report: LinkedIn’s Hidden Extension‑Scanning Scripts A new report du...

What is a Function? A function is a block of code designed to perform a specific task. Instead of writing the same code repeatedly, you can write it once insid...

Overview A completely useless, single‑file web app that lets you talk to a virtual teapot using the Hyper Text Coffee Pot Control Protocol HTCPCP/1.0 from the...

Overview This submission was created for the DEV April Fools Challenge. It’s a 404 page that gets “worse” the more you encounter it. Instead of simply helping...

On May 18 , 1969, NASA launched Apollo 10. Three astronauts — Tom Stafford, John Young, and Gene Cernan — flew to the Moon, entered lunar orbit, and descended t...

React has consistently been one of the most popular libraries for building modern web applications. With every new release, the React team focuses on improving...

If you’ve ever felt overwhelmed by what to learn in web development, you’re not alone. There’s always a new framework, tool, or trend appearing, and it’s easy t...

Reverse Engineering Cloudflare's React‑Based Bot Detection in 2026 Some sites protected by Cloudflare now embed their bot‑detection logic inside React componen...

Si estás aprendiendo React, en algún punto te vas a hacer esta pregunta: > “¿Cómo recorro arrays correctamente?” Y sí… puedes usar un for, pero esa no es la for...

There are multiple ways to make your SVG animated: - SVG/SMIL - CSS animation - JavaScript SVG/SMIL SMIL stands for Synchronized Multimedia Integration Language...