Morning.dev

DEV Community • 2026-04-23 07:51

Solving CartPole Without Gradients: Simulated Annealing

In the previous post, we solved CartPole using the Cross-Entropy Method: sample 200 candidate policies, keep the best 40, refit a Gaussian, repeat. It worked beautifully, reaching a perfect score of 500 in 50 iterations. But 200 candidates per iteration means 10,000 total episode evaluations. That got me wondering: do we really need a population of 200 to find four good numbers? The original code...

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15m read

DEV Community • 2026-04-23 07:50

🧠 Google Cloud NEXT ’26: Building a Real AI SaaS (Not Just Another Demo)

Most write-ups from Google Cloud NEXT ’26 focus on what was announced. This one focuses on something else: What actually changes for developers — when you try to build with it. So instead of summarizing keynotes, I built a mini AI SaaS product using the stack highlighted across NEXT ’26: Vertex AI (Gemini) Cloud Run Firebase Auth React frontend 🎯 Why This Matters The biggest s...

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3m read

GitLab CI: How to Use a Dockerfile from Remote Repository

DEV Community • 2026-04-23 07:49

GitLab CI: How to Use a Dockerfile from Remote Repository

🧩 The Problem You have multiple (group) projects (frontend, backend, etc.) and you want: A single Dockerfile in a central repo (cicd-template/frontend/gitlab-template.yml) All group app repos reuse it No duplication, no drift, better control You try: include: - project: "kelvyn-labs/cicd-template" ref: master file: "/frontend/gitlab-ci.yml" But during the pipeline...

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2m read

DEV Community • 2026-04-23 07:49

Your MCP Server Is a QA Engineer You Haven't Hired Yet

We built 118 MCP tools for our SaaS and organized them into 19 files. Then we ran 722 manual test scenarios by talking to Claude. What we found changed how we think about MCP servers. Unit tests verify that code does what you wrote. They do not verify that your data makes sense. The accidental discovery We built the MCP server for data entry - "record this expense," "create this invoi...

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7m read

DEV Community • 2026-04-23 07:48

I shipped a 147,000-word interactive book as a free SPA — here's the stack

TL;DR — I just shipped The Wanting Mind, a 147,000-word interactive book that reads like Wikipedia + a podcast + a graph. It's free, no signup, all four languages (EN/JA/ZH/TH). The whole thing is a React 19 SPA backed by Supabase, Capacitor for the mobile apps, and a chunk of AI (ElevenLabs for narration, fal.ai for chapter art, Gemini for video, Claude for translation). This post is what worked...

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5m read

Product Hunt — The best new products, every day • 2026-04-23 07:48

Quarkdown

Markdown wit LaTeX in a modern typesetting system Discussion | Link

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1m read

Rachel Andrew • 2026-04-23 07:40

What would a 2026 CSS Anthology look like?

In 2004 I published the first edition of The CSS Anthology with Sitepoint. The idea for the book was to take the entire CSS 2.1 specification, and come up with 101 examples to show people how to use all of the CSS that existed. I have a copy on my shelf, but recently discovered you […]

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1m read

DEV Community • 2026-04-23 07:39

AWS EC2 vs Lambda | Pros and Cons?

Cost EC2 Pay Rent 2.Lambda Charged based on invocation and Memory used Flexibility EC2 have more Flexibility Integration Integration with AWS Services is easy. By Default it have Load Balancer, Autoscaling Groups, Target Groups, Scaling etc.. Speed Easy to Developed the API. Take less time to build the functionality

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1m read

DEV Community • 2026-04-23 07:39

AI Dev Weekly #7: Claude Code Loses Pro Plan, GitHub Copilot Freezes Signups, and Two Chinese Models Drop in 48 Hours

AI Dev Weekly is a Thursday series where I cover the week's most important AI developer news, with my take as someone who actually uses these tools daily. The flat-rate AI subscription era ended this week. Anthropic pulled Claude Code from the $20 Pro plan. GitHub froze all new Copilot signups. And while Western companies were busy raising prices, two Chinese labs dropped frontier models within 4...

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4m read

DEV Community • 2026-04-23 07:37

我实际跑了一次 TestSprite：它能给出有用反馈，但中文本地化还有明显空缺

我这次直接登录 TestSprite，用一个现成项目实跑了一遍，没有停留在官网介绍页。我的关注点很直接：它能不能快速给出可执行的测试反馈，失败信息够不够可读，中文开发者用起来顺不顺。我进入的项目叫 wildbyte，目标地址是 https://jsonplaceholder.typicode.com。项目总状态是 7/10 Pass。我重点看了一条失败用例：Create Post with Invalid Data Type。这条用例的预期很清楚：向 /posts 提交错误数据类型时，接口应该返回 400。实际结果是： Expected status code 400 but got 201 这个结果本身就有价值。它说明当前接口在错误输入下依然创建成功，后端约束比测试预期更宽松。无论问题出在真实 API、Mock 行为还是数据契约，这条失败都能立刻推动开发者去复查接口边界。...

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1m read

📦 Service Workers in PWAs: How to Cache Content and Supercharge Web App Performance

DEV Community • 2026-04-23 07:36

📦 Service Workers in PWAs: How to Cache Content and Supercharge Web App Performance

Imagine this. You open a web app on a weak network. Instead of endless loading, it opens instantly. Pages feel smooth. Key content is available even offline. The experience feels closer to a native app than a traditional website. What changed? Behind the scenes, a quiet but powerful technology is doing the heavy lifting: Service Workers. If you’re building Progressive Web Apps (PWAs), understa...

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4m read

DEV Community • 2026-04-23 07:36

JSON Formatter Pro vs REST Client: Which Is Better in 2026?

JSON Formatter Pro wins for pure JSON handling, while REST Client dominates API testing. I tested both extensions across 50 API endpoints and 200+ JSON files over the past month. The json formatter pro vs rest client debate comes down to your primary use case: formatting versus comprehensive API development. Last tested: March 2026 | Chrome latest stable Quick Verdict Category Winner Reason ...

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6m read

DEV Community • 2026-04-23 07:36

How a fintech platform achieved 99.97% uptime with graceful degradation and circuit breakers

Circuit breakers saved our fintech platform from daily outages Picture this: your payment platform processes €2.3 million daily, but every morning it crashes when users actually need it. That was our reality until we stopped thinking about scaling up and started thinking about failing gracefully. The problem: cascading failures during peak hours Our European fintech platform...

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3m read

Product Hunt — The best new products, every day • 2026-04-23 07:36

Flitch

Turn your data into insights Discussion | Link

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1m read

Cách sử dụng MoonPay API (Tích hợp On-Ramp và Off-Ramp Fiat)

DEV Community • 2026-04-23 07:33

Cách sử dụng MoonPay API (Tích hợp On-Ramp và Off-Ramp Fiat)

Các giải pháp chuyển đổi tiền pháp định sang tiền điện tử (fiat-to-crypto on-ramp) truyền thống yêu cầu rất nhiều thủ tục giấy tờ tuân thủ, thiết lập quan hệ ngân hàng và tích hợp KYC phức tạp. MoonPay API giúp đơn giản hóa toàn bộ quy trình: bạn chỉ cần tạo một URL đã ký, nhúng widget vào ứng dụng, còn lại MoonPay sẽ lo việc thanh toán, xác minh danh tính và giải ngân vào ví người dùng. Hãy dùng...

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8m read

Schema Markup for AI Engines: The Citation Layer That Most Sites Still Ignore

DEV Community • 2026-04-23 07:33

Schema Markup for AI Engines: The Citation Layer That Most Sites Still Ignore

Originally published on The Searchless Journal Most websites have schema markup. They use JSON-LD to tell Google about articles, products, organizations, and local businesses. They see results in rich snippets, knowledge panels, and structured search results. But when those same sites are invisible to ChatGPT, Perplexity, and Gemini, the reason is often invisible: the schema they implemented is...

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19m read

كيفية استخدام MoonPay API: دمج بوابات الدفع من العملات الرقمية إلى العملات التقليدية والعكس

DEV Community • 2026-04-23 07:33

كيفية استخدام MoonPay API: دمج بوابات الدفع من العملات الرقمية إلى العملات التقليدية والعكس

كانت عمليات تحويل العملات الورقية إلى عملات مشفرة (Fiat-to-crypto on-ramps) تعني أسابيع من الأوراق القانونية والعلاقات المصرفية وموردي "اعرف عميلك" (KYC) المُجمعة بصعوبة. تختصر واجهة برمجة تطبيقات MoonPay هذه العملية في تكامل واحد: تقوم بإنشاء عنوان URL موقع، وتضع أداة واجهة المستخدم (widget) في تطبيقك، ويتولى MoonPay معالجة البطاقات، والتحويلات المصرفية، والتحقق من الهوية، والمدفوعات إلى محفظة ال...

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6m read

DEV Community • 2026-04-23 07:33

A Powerful Node.JS CLI Time Tracker ⏱️🚀

Introducing super-time-tracker: A Node.js CLI Time Tracker (Rebuilt) After using my own track-time-cli for a while, I found myself wanting more — more commands, more flexibility, and a cleaner experience overall. So I rebuilt it from the ground up, gave it a new name, and published it as super-time-tracker. Introducing super-time-tracker, a Node.js CLI utility for tracking the time you...

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5m read

DEV Community • 2026-04-23 07:33

A Powerful Node.JS CLI Time Tracker ⏱️🚀

Introducing super-time-tracker: A Node.js CLI Time Tracker (Rebuilt) After using my own track-time-cli for a while, I found myself wanting more — more commands, more flexibility, and a cleaner experience overall. So I rebuilt it from the ground up, gave it a new name, and published it as super-time-tracker. Introducing super-time-tracker, a Node.js CLI utility for tracking the time you...

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5m read

DEV Community • 2026-04-23 07:33

LLM Leaderboard: Best AI Models Ranked (April 2026)

There is no single best model in April 2026 — the leaderboard has fractured by task. Claude Opus 4.7 dominates coding benchmarks at 82% on SWE-bench Verified and ranks first on LM Arena with 1504 Elo rating. Three models tie at the top of the Artificial Analysis Intelligence Index (score of 57): Claude 4.7, Gemini 3.1 Pro Preview, and GPT-5.4. DeepSeek V3.2 offers optimal pricing at $0.29 per mil...

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3m read