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DEV Community • 2026-04-22 04:15

MCP is the authoring layer. Execution should cost zero tokens.

Two posts on Reddit this month independently measured MCP's token overhead. Both reached the same number: 30–40% more tokens than the CLI equivalent. "I added Notion, Sentry and Shortcut MCPs and was surprised to see every session starting off with 40% of the context used." — NoSlicedMushrooms (28 upvotes), r/ClaudeAI "A batch job with 4 MCP servers blew through our token budget in 2 hours. The...

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4m read
DEV Community • 2026-04-22 04:08

Simple JavaScript Automation Unit Testing Using Jest

Objective Learn to implement automated unit testing using Jest in a Node.js application. By the end of this lab, you will: Set up a Node.js project with Jest for unit testing Write unit tests for functions with validation and error handling Understand the difference between statement and branch coverage Run tests and generate coverage reports to evaluate code quality Prereq...

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11m read
DEV Community • 2026-04-22 04:05

TestSprite — localized dev review with feedback

TestSprite 实战评测:一次“本地化敏感”的自动化测试体验(含问题清单与改进建议) 发布平台建议:CSDN / DEV.to / Medium(中文) 任务要求:本文为真实试用体验总结;发布时请补充你的真实截图与文章链接。 说明:我在一个真实的 Web 项目(含登录、订单列表、结算页)中接入并运行了 TestSprite,对其在 中文本地化/国际化(i18n/l10n) 场景下的表现做了重点观察。 一、背景与评测目标 我选择的测试对象是一个面向多地区用户的电商后台(React + Node.js),功能包含: 登录与权限校验 订单列表(含时间、金额、状态) 订单详情与退款 结算页(货币与税费计算) 这类系统最容易出现“本地化细节”问题:日期格式、货币符号、小数点、千分位、时区显示,以及中文输入与非 ASCII 字符(如...

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1m read
DEV Community • 2026-04-22 04:05

I Thought AI Actually Understood Language… I Was Wrong (Day 1)

Today I started my 90-day journey into Artificial Intelligence. No hype, no shortcuts — just learning step by step and sharing what I understand. What I Learned Today I began with Large Language Models (LLMs). Before today, I genuinely thought AI understands language like we do. But the reality is very different. LLMs don’t understand language.They predict the next word. How It Actually Wor...

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1m read
American Express Technology • 2026-04-22 04:00

Building Trust in AI-Powered Transactions with Amex Agentic Commerce Experiences

A model for secure, intent-driven transactions executed by agents on behalf of Card Members.

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1m read
Newest questions tagged css - Stack Overflow • 2026-04-22 03:55

Chart.js not responding to resize in grid column

I need my chart to resize to the full width and height of it's container within a grid column. I've read through the documentation and made sure maintainAspectRatio is false and the container position is set to relative. At best, I've managed to get it to resize only on screen enlargement (it resizes on screen minimize on page refresh) by wrapping the container in another div. <div className=&q...

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1m read
DEV Community • 2026-04-22 03:52

Cursor Rules for Java — Production Patterns That Actually Ship

Cursor Rules for Java — Production Patterns That Actually Ship Cursor with Java is a different beast than Cursor with Python or TypeScript. Java projects have deep type hierarchies, annotation-driven frameworks, XML build files, and a ceremony level that trips up AI assistants constantly. But when you configure it right, Cursor becomes an enterprise Java power tool — IntelliSense-grade ...

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16m read
DEV Community • 2026-04-22 03:52

Cursor Rules for Vue.js: Composition API Patterns That Scale

Cursor Rules for Vue.js: Composition API Patterns That Scale Vue 3 has been stable for years, <script setup> is the default template, Pinia replaced Vuex, and defineModel killed update:modelValue boilerplate. None of that is evenly distributed across the corpus your AI assistant trained on. So when you let Cursor or Claude Code generate Vue, you get an awkward dialect: Composition...

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12m read
Product Hunt — The best new products, every day • 2026-04-22 03:51

Framework Laptop 13 Pro

A Linux-first laptop with premium ambitions Discussion | Link

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1m read
Product Hunt — The best new products, every day • 2026-04-22 03:51

Framework Laptop 13 Pro

A Linux-first laptop with premium ambitions Discussion | Link

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1m read
DEV Community • 2026-04-22 03:48

How to Avoid the Trap: Choosing the Right Chat API for Social Apps

Today, every mobile app needs to be social. Whether you're building a dating app, a fan community or a voice chat for gamers, a messaging module is essential. Most startup teams just want to launch their MVP fast. So, grabbing a third-party In-app Chat API or Chat SDK is usually the go-to move. But here is the thing. Building chat for a social app is totally different from building an office tool...

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8m read
DEV Community • 2026-04-22 03:46

I built create-fast-express-structure to stop rebuilding the same Express setup every time

Every time I started a new Express.js project, I ended up repeating the same work. Create the folders. Set up app.ts, server.ts, and index.ts. Choose between TypeScript or JavaScript. Deal with ESM vs CommonJS. Add linting, formatting, testing, env files, security middleware, database starter, auth starter, and then fix the small things that always break the flow. So I decided to build a CLI for...

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2m read
DEV Community • 2026-04-22 03:46

My social media inactivity is coming back to bite me.

For years, I’ve been developing both client projects and my own internal ones. But for the past couple of years, I’ve been working on a larger project that’s now close to going public. Today, I shared a small sneak preview on social media… and it landed in a void. I neglected to build a network. Painful realization.

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1m read
DEV Community • 2026-04-22 03:45

Your WordPress Site Is Hard to Edit Because It Was Built for Developers, Not Editors

You launch the site. It looks great. The client is happy. Three months later, they need to add a new section to a service page. Simple request. Except it takes a developer two hours to do it because the layout is hardcoded into a template. That's not a bug. That's an architecture problem. The Real Problem With Rigid Templates A common WordPress pattern: build a custom template for ea...

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Product Hunt — The best new products, every day • 2026-04-22 03:43

ConsoleMini

Turn a Mac mini into a living-room retro/PS console Discussion | Link

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1m read
DEV Community • 2026-04-22 03:43

Creating an Android Config Plugin for Expo | React Native Guide

Originally published on PEAKIQ Introduction Expo config plugins allow you to extend and customize the native behavior of your Expo app. Here, we will create a plugin that modifies various aspects of the Android project configuration, including the AndroidManifest.xml, Gradle properties, and MainApplication.java file. Prerequisites Basic knowledge of JavaScript and Node....

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3m read
RAG: How AI Models Use Your Data Without Forgetting
DEV Community • 2026-04-22 03:42

RAG: How AI Models Use Your Data Without Forgetting

Introduction Large language models are stateless. Every time you start a conversation with one, it begins from zero, with no memory of previous sessions, no access to your internal documents, no awareness of events that happened after it was trained. This is a fundamental architectural constraint, not a bug. By default, an LLM has no access to private or real-time data unless explicitly...

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17m read
DEV Community • 2026-04-22 03:38

After Fixing Thread Pool Exhaustion, A Reader Asked: Did You Add a Circuit Breaker? Here's What I Did Next

This is a follow-up to my previous article — Our Spring Boot API Froze Under Load [https://hashnode.com/edit/cmny3jv0u00bg2dlndzza08zy] A reader asked me a question I couldn't stop thinking about. In my last article I wrote about how our Spring Boot API froze under load because of thread pool exhaustion. We fixed it with two things — adding timeouts on external calls and isolating slow depende...

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8m read
React DOM Internals
DEV Community • 2026-04-22 03:36

React DOM Internals

Before diving in this is a continuation of the React 19 Internals series. If you haven’t read the previous part, I’d recommend starting there. That said, if you already understand till the React Elements, you’re good to go — feel free to jump straight in. Let’s start with the foundation: what does React DOM actually do? At its core, React DOM acts as the bridge between React Elements and the Bro...

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29m read
DEV Community • 2026-04-22 03:35

Google's Project Jitro Just Redefined What a Coding Agent Is. Here's What It Actually Changes.

Project Jules used to tell your AI what to do. Jitro tells it what you want. That gap — between task execution and outcome ownership — is the entire bet Google is making with its next-generation coding agent. The Problem With Every Coding Agent Right Now Every major AI coding tool today, GitHub Copilot, Cursor, Windsurf, OpenAI's Codex — operates on the same underlying model: you defin...

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5m read
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