DEV Community • 2026-03-21 09:17

CORS Explained: Why Your Frontend Cannot Talk to Your API

CORS Explained: Why Your Frontend Cannot Talk to Your API Your React app calls your Express API. Chrome blocks the request. The error says "No Access-Control-Allow-Origin header." You add cors() and it works. But do you know what actually happened? What CORS Is Cross-Origin Resource Sharing. Browsers block requests from one origin (domain:port) to another by default. CORS he...

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2m read
DEV Community • 2026-03-21 09:14

Advanced API Rate Limiting: Sliding Windows Token Buckets and Distributed Counters

Since I cannot write files, I will output the article directly. Here is the complete, publication-ready dev.to article: Every production API hits the same inflection point: traffic grows, abuse appears, and suddenly you need to answer the question "how many requests should I allow, and for whom?" Rate limiting sounds simple until you run multiple servers, need sub-second accuracy, and have end...

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15m read
DEV Community • 2026-03-21 09:12

Distributed Locking: Preventing Race Conditions Across Services

Both file writing and bash are denied. Since you asked me to output the article, here it is directly: Every backend engineer eventually faces the moment: two requests hit your system at the exact same millisecond, and suddenly a customer is charged twice, a seat is double-booked, or inventory goes negative. In a monolith, you might get away with a database transaction or an in-process mutex. I...

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14m read
DEV Community • 2026-03-21 09:09

Why the Next Generation of Creator Tools Must Prioritize Authenticity Over Automation

The Problem with the 'AI-Wrapper' Era In the last 12 months, we've seen an explosion of AI tools for the creator economy. Most follow a predictable pattern: a thin UI over a GPT prompt that promises to "automate your social media." But for developers, founders, and personal brands, this approach is fundamentally flawed. A personal brand's value is derived from its personality. When yo...

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2m read
DEV Community • 2026-03-21 09:09

Feature Flags from Scratch: Build a Runtime Toggle System in TypeScript

I need file write permission to save the article. Since both Write and Bash are denied, I'll output the article directly below. Every backend team eventually faces the same question: how do we ship code to production without shipping the feature? The answer, almost universally, is feature flags. But most teams reach for a third-party service before understanding what they're actually buying. I...

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15m read
DEV Community • 2026-03-21 09:02

Building AI-Ready Backends: Streaming Responses, Tool Use, and LLM Integration Patterns

Every backend team is getting the same request: "add AI to it." Most teams bolt on an OpenAI call in a route handler and call it done. Then they hit streaming, timeouts, cost explosions, and hallucination-powered data corruption. Here's how to build backends that integrate LLMs properly — with streaming, tool use, cost controls, and graceful degradation. The Architecture Problem LLM c...

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7m read
The Unfolding Mystery of Fernly Park
HackerNoon • 2026-03-21 09:00

The Unfolding Mystery of Fernly Park

Dr. Sheppard rushes to Fernly Park after a mysterious phone call reporting Roger Ackroyd’s murder, only to find Ackroyd dead in his locked study. Parker the butler is flustered, a critical letter has vanished, and Flora Ackroyd was the last to see him alive. The inspector arrives to investigate, uncovering suspicious shoe prints and a narrow timeline, setting the stage for a classic locked-room wh...

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1m read
DEV Community • 2026-03-21 09:00

I Built a Full HTTP Client Extension for VS Code — Here's Everything I Learned

DotFetch v1.2.0 — A deep dive into building a professional REST client inside VS Code with Auth, Retry Logic, JSON Highlighting, and a modular ES Modules architecture." tags: vscode, typescript, javascript, webdev cover_image: https://raw.githubusercontent.com/kareem2099/DotFetch/main/media/screenshot-main.png I've been building DotFetch — a VS Code extension that replaces Postman/Insom...

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7m read
DEV Community • 2026-03-21 08:59

Angular - Power Of Renderer2

When we build apps with Angular, we usually stay inside the world of templates and signals. It works great for almost everything. But sometimes you hit a wall and need a lower level access to build a custom tooltip, a complex file generator, or a special pagination system. In those moments, you might want to use "document" or "nativeElement" to change a color or move an element. However, doing thi...

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6m read
Iran threatens to target tourist, recreational sites worldwide as it keeps up attacks on Gulf
newest submissions : multi • 2026-03-21 08:51

Iran threatens to target tourist, recreational sites worldwide as it keeps up attacks on Gulf

submitted by /u/Sombralis to r/worldnews [link] [comments]

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1m read
Introducing helping-js v2: A Zero-Dependency Utility Library to Level Up Your App
DEV Community • 2026-03-21 08:48

Introducing helping-js v2: A Zero-Dependency Utility Library to Level Up Your App

Introducing helping-js v2: A Zero-Dependency Utility Library to Level Up Your App TL;DR — helping-js is a lightweight JavaScript utility library with no dependencies. It adds type checkers, regex patterns, schema-based validation, and safe browser APIs that work in Node, Vue, React, Express, and the browser. In this post, we’ll see how it can simplify your code. Why helping...

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5m read
DEV Community • 2026-03-21 08:45

I built my first website in 2004. Here's what I wish someone had told me.

A honest letter from a grandfather who codes — to everyone who thinks they started too late. Most of you reading this were probably still figuring out what "the internet" even was. I wasn't young. I wasn't fresh out of university. I wasn't some prodigy who grew up with a keyboard in my hands. I was just a person who was genuinely, deeply curious — and that turned out to be enough. The ...

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2m read
DEV Community • 2026-03-21 08:40

Why I Shipped a Linux Desktop App as an AppImage (and Skipped Snap/Flatpak)

Linux packaging is where good desktop apps go to die. If you’ve shipped a Linux desktop application, you already know the pain: you can build something solid, fast, and stable… and then lose days (or weeks) fighting packaging quirks across distros, runtimes, sandboxes, portals, GLIBC mismatches, and “works on my machine” dependency landmines. I’m building OpenChat for Linux, a lightweight ChatGPT ...

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4m read
DEV Community • 2026-03-21 08:40

How I Built a SaaS in a Weekend That Replaces Google Alerts

Google Alerts has been broken for years. It misses most mentions, delivers them days late, and gives you zero context about what was said. I know because I tracked it. Out of 10 real mentions of my brand in a week, Google Alerts caught 2. The paid alternatives (Mention, Brand24) start at $99+/mo and are built for enterprise marketing teams. There's nothing in between for indie founders, freelance...

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4m read
DEV Community • 2026-03-21 08:32

I Used Skill Creator v2 to Improve One of My Agent Skills in VS Code

I just published a video showing how I used Skill Creator v2 to improve an existing AI skill inside VS Code, and honestly, I was seriously surprised at how much this thing does. What impressed me most is that it does much more than just rewrite instructions. It can: review an existing skill suggest targeted improvements run evals against a baseline compare outputs side by side generate benchma...

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7m read
DEV Community • 2026-03-21 08:32

Hey Dev.to! I built a visual stack builder to stop wasting hours on stack decisions

👋 I'm Rahul, and I just built StageVia - a visual stack builder for indie hackers. The Problem Every time I start a new MVP, I waste hours on deciding stack or imagine how it looks like or how it fits instead of building. The Solution Visual tool that shows you: What's essential vs optional Honest service comparisons Free-tier-first recommendations Takes 60 seconds. No ...

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1m read
newest submissions : multi • 2026-03-21 08:27

Iran fires missiles toward US-UK base in Indian ocean, Iran's Mehr says

submitted by /u/LiorZim to r/news [link] [comments]

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1m read
Cascading Style Sheets • 2026-03-21 08:25

offline tool to generalise inline style accross many php files

submitted by /u/Nul0op [link] [comments]

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1m read
CISA Flags Apple, Craft CMS, Laravel Bugs in KEV, Orders Patching by April 3, 2026
The Hacker News • 2026-03-21 08:25

CISA Flags Apple, Craft CMS, Laravel Bugs in KEV, Orders Patching by April 3, 2026

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Friday added five security flaws impacting Apple, Craft CMS, and Laravel Livewire to its Known Exploited Vulnerabilities (KEV) catalog, urging federal agencies to patch them by April 3, 2026. The vulnerabilities that have come under exploitation are listed below - CVE-2025-31277 (CVSS score: 8.8) - A vulnerability in Apple

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1m read
DEV Community • 2026-03-21 08:21

Claude Code vs Goose: Why This Free AI Coding Agent is Making Developers Rethink the $200/Month Option

If you have been watching the AI coding space lately, you have probably noticed something interesting happening. Developers are starting to question whether they need to pay $200 a month for Claude Code when Block just open-sourced Goose for free. And honestly? It is a fair question. Let me break down what is actually happening in this space and help you figure out which one makes sense for your...

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4m read
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