JavaScript Mastery

Have you locked in your spot before the sale ends?

48 hours left to get the bundle deal at 33% off + PPP pricing (applies to your country)

You get both:

- Complete Testing Course (+ Updates)
- Ultimate next.js 16 course

A quick look inside the Testing curriculum  
✓ introduction to next.js testing
✓ types of testing (unit, integration, e2e)
✓ testing strategies & tools
✓ applied testing (setup, unit, server, server actions, AI integration)
✓ + modules added daily

After this? regular price.

Grab it Now 🚀 jsm.dev/yt-testing

1 week ago (edited) | [YT] | 151

JavaScript Mastery

🎉 IT’S HERE: The Launch Bundle is officially LIVE!

We’ve just unlocked access to something massive, built to help you level up your frontend skills, build *with confidence*, and never guess if your code will break in production again.

🚀 What’s inside the launch bundle?

✅ The complete Ultimate Next.js 16 Course
✅ The brand-new Testing Mastery Course
✅ A tactical eBook for real-world testing workflows (delivered by November)

This bundle is only available during launch week → it’s 33% off (PPP supported), and then it’s gone. For good.

🧠 Already bought the Next.js course?
Check your inbox, you’ve got a private loyalty offer just for the Testing course.

Let’s gooo. Build confidently. Ship with tests. Upgrade your dev game.

🟦 → Unlock the Bundle Now: jsm.dev/yt-nextjstesting

⏳ Offer ends Oct 29. Ask any questions below or email support@jsmastery.pro for the bundle support 💬

1 week ago (edited) | [YT] | 181

JavaScript Mastery

Learning to code is the easy part.


The hard part?

- Writing tests that don’t break every 2 minutes
- Structuring a Next.js app that doesn’t collapse under pressure
- Actually shipping without fear

After seeing thousands of devs hit the same walls, we decided to build something different.


Tomorrow we’re dropping the Dev Mastery Bundle:

✅ The Complete Testing Course (NEW)

✅ The Ultimate Next.js 16 Course (fully updated)

→ jsm.dev/ship-with-confidence


It’s launching with 33% off for the first week only.

If you’ve been learning in circles and want something more solid, stay close. 👀

This one’s built for the dev you’re becoming.

2 weeks ago (edited) | [YT] | 291

JavaScript Mastery

Got something special dropping this week, for the devs who want to build better and ship with confidence.



Are you ready? 👇



And if you still don’t know what this is all about.. get early access here → jsm.dev/ship-with-confidence

2 weeks ago | [YT] | 110

JavaScript Mastery

Interviewer: “Tell us about your projects.”
Everyone else: “I built an e-commerce site with dark mode.”
You: “I built an e-commerce site and wrote tests for 3rd-party failures, auth edge cases, and payment bugs.”


Guess who gets the callback?

3 weeks ago | [YT] | 686

JavaScript Mastery

Are you waiting for the Ultimate Next.js Testing course?

Covers, unit → integration → E2E across Server Components, Server Actions, APIs, Performance, Load testing, Accessibility, CI/CD & more.

3 weeks ago | [YT] | 184

JavaScript Mastery

Which design do you prefer for a Dev Events application?

1 month ago | [YT] | 223

JavaScript Mastery

Which project would you like to vibe code with AI prompts? 😎

3 months ago | [YT] | 289

JavaScript Mastery

Hey everyone! We’re trying something new: our first AI-assisted build video!

1. Full App w/ AI (Devin builds everything)
🔥 Fast, practical, real-world learning
⚠️ Less follow-along-friendly, may need paid credits


2. Specific Features w/ AI
✅ Easier to follow, works with free credits
😐 Less "wow" factor


3. Build Showcase (Faster pace, you watch and learn)
🎯 Shows how fast you can ship with AI
📺 You watch, learn, and try it yourself if you want later on

Which one should we go with? 👇

3 months ago | [YT] | 137