JavaScript Mastery, Los Angeles, CA (2026)

10/02/2026

NEW VIDEO: No One Knows How To Read AI Code Anymore | Build a Full Stack Codebase Architecture App 🚀

→ https://youtu.be/-AkIj8TG3Uc

I don't read the code my agent writes.

Neither do you.

Nobody can read AI code anymore.

Not because it's bad. But because there's too much of it, written too fast, by something that never gets tired.

Now put a team on it. Four people - all shipping with agents - nobody reading anyone's output. Ask that team what breaks if you change a certain file. Nobody knows.

Well, today you're building the thing that fixes that! 🚀

Meet Cartograph.

Point it at a GitHub repo and it turns the entire codebase into a map you can click through.

✅ Select any file and see exactly what breaks if you touch it.
✅ Get an explanation of any module, written from the files it actually connects to, with every filename clickable.
✅ Or just ask it a question - "Where does auth get enforced?" - and watch an agent walk the real graph, step by step, and come back with an answer you can verify.

Tech Stack:

- Next.js and TypeScript
- ts-morph parses the code
- React Flow draws the map
- Clerk runs the teams
- Supabase holds the data
- LangSmith proves the AI isn't lying
- And CodeRabbit reviews the code

Let's go read the code you've been ignoring → https://youtu.be/-AkIj8TG3Uc

09/25/2026

NEW VIDEO: Claude Code Full Course | Master AI Agents for Development 🚀

If your entire Claude Code experience so far is typing "build this feature" and hitting enter, you're using maybe ten percent of this tool.

In this video, we'll create a full-stack eCommerce app inspired by a real luxury storefront - and along the way you'll learn how Claude works inside your codebase.

✅ How to give it persistent project context with CLAUDE.md
✅ How permissions control what it can access
✅ When Plan Mode is worth it
✅ How Skills turn processes you keep repeating into reusable workflows
✅ How subagents let Claude hand focused work to another agent without filling your main context with everything it had to read along the way
✅ Why Claude shouldn't be the only one checking its own work, and how CodeRabbit caught AI placeholder code quietly leaking subscriber emails
✅ And more!

This video is optimized for one thing:

That you walk away actually understanding how to work with an AI coding agent... in a couple of hours, not a couple of weekends.

Companies are already paying engineers $200,000 to $300,000 a year to build AI agents, orchestration systems and production workflows.

Not because those engineers can type "build this feature" into a prompt.

Because knowing how to work with an agent while building real software is a completely different skill from getting one to generate code.

Get started here ➡️ https://youtu.be/u2QqWkMv3Lg

09/16/2026

NEW VIDEO: The Skill That Separates Vibe Coders From Engineers 🚀

Best thing that's ever happened to my code.

My AI agent stopped mid-build and refused to write the feature.

Here's what it said: "This screen has to show a total. Nothing in your plan says where that total comes from. That's a decision nobody made. Go make it."

Think about how rare that is.

Every other agent would have picked something, buried it in the code, and moved on.

You'd find out three weeks later when the number was wrong.

Take a look -> https://youtu.be/Vok_nReMFaU

09/04/2026

NEW VIDEO: What Actually Breaks When Your App Gets Popular | System Design Fundamentals 🚀

Let’s take a perfectly good app and break it. On purpose. Over and over.

Because thanks to AI, building a full app - frontend, backend, database, deployed and online - is no longer the hard part.

The hard part is what happens when that app gets popular.

❌ When one server isn't enough.
❌ When the database can't keep up.
❌ When it’s slow and you don't know why.

That’s system design.

Most tutorials teach it as a pile of scary jargon - load balancers, replicas, sharding, caching - thrown at you all at once on day one.

In the latest JavaScript Mastery tutorial, we do the exact opposite.

We start with one server and one database.

Then, we break it - and we fix exactly one thing.

AI will happily write the code for you today. What it won't do is decide if your user's follower count is allowed to be 30 seconds stale, or if their account balance can be delayed.

That call is about your product, your users, and what they will tolerate. It requires someone who understands the whole system.

The typing is automated. The judgment is the job.

Let's break some things!

Watch the full breakdown here: https://youtu.be/EaXHfuHRWwg

08/21/2026

NEW VIDEO: This Is How You Build Fullstack Projects With AI in 2026! 🚀

What if you could search a video like you search Google - but instead of a list of links, land on the EXACT second where that topic is explained?

Feels like weeks of work, right?

It's a couple of minutes.

The whole platform around it - a couple of hours.

Don't believe me?

In this video, I'm going to show you how!

Together, we'll build Vertex - a full-stack learning platform with an admin dashboard and plain-English search that jumps straight to the moment a topic is taught.

❌ Not a landing page.
❌ Not another vibe-coded demo.
✅ Real auth, real content, real analytics.

Most people just keep prompting until something works.

We're not going to build this way!

Instead, we'll use:

✅ Agent skills
✅ Context files
✅ Project rules
..so the AI actually understands your project. 🔥

You stay the engineer - it just moves faster than you can type.

Tech Stack:

Next.js, TypeScript, Tailwind CSS, Sanity, Clerk, PostHog, CodeRabbit.

Let's get started!

🔗 https://jsm.dev/vertex-fb-yt

08/07/2026

NEW VIDEO: From a Sketch to a Deployed App - Watch THREE AI Models Race LIVE! 🏎️💨

Every AI tutorial right now builds the exact same app: A chatbot with a model-picker dropdown.

But that dropdown hides the real question nobody is answering:

❓"Which model should you actually be using for real work?"

In the latest JavaScript Mastery YouTube video, I am going to show you how to build the LLM Arena! 🚀

One prompt, up to three open-source models, streaming their answers side-by-side, live. No vibes, just hard numbers:

✅ Tokens per second
✅ Time to first token
✅ Real-time cost

Users vote on the winner, feeding a public leaderboard that tells you which model actually wins in the real world.

🟡 The Agentic Workflow:

Here is what makes this build completely different:

This entire app started as nothing more than a plain English text file and a rough Excalidraw sketch.

We take it all the way to a real, deployed application - completely agentically - using Claude Code.

🟡 The Stack:

✅ Next.js 16
✅ Prisma
✅ Postgres
✅ Clerk for auth
✅ PostHog for full observability
✅ Arcjet to lock down endpoints against bots and prompt injection
✅ Greptile reviewing every PR our agent opens, live.

Let's get into the build!

→ https://jsm.dev/arena-fb-yt

07/17/2026

NEW VIDEO: Build and Deploy a Full Stack Ground News Clone | Learn AI Engineering in 2026 🚀

Be honest: how many times have you gone back and forth with an AI on the same feature and still not gotten what you wanted?

In this video, we're flipping that problem around with a workflow I call "Vibe Engineering".

You define the product, the AI drafts its own prompts, you approve them, and it builds the entire app in small, focused steps.

Master this system once, and you can build any app after this! 🙌

To prove it works, we’re building Skew from scratch - an AI-powered news platform that scrapes real articles and shows you their exact bias before you even open them.

What we're building with:

→ Next.js & TypeScript for the full-stack app
→ Supabase (PostgreSQL + pgvector) for the database & semantic search
→ Clerk for seamless auth
→ Vercel AI SDK for structured AI analysis
→ PostHog for analytics & session replays
→ Tailwind CSS for styling
→ Oxylabs for the automated web scraping pipeline

Glad to have collaborated with Oxylabs for this video! With 175M+ rotating residential proxies and ultra-low latency, it’s easy to see why PCMag named them the Best Proxy Service of 2026. 🔥

Visit https://oxylabs.io/javascript for a free trial of Oxylabs featuring up to 2,000 web scraping results. Use my code JAVASCRIPT to grab 20% off all plans!

Dive in here → https://jsm.dev/skew-fb-yt

06/26/2026

NEW VIDEO: NestJS Full Course for Beginners in 2026 | Build a Production-Ready API 🚀

You've been building backends with Express for a while.

But every job description now says "NestJS", and every modern tutorial assumes you already know it.

The good news?

Your Express knowledge isn't wasted, it's a head start.

This video is in two parts.

1️⃣ First, a full NestJS crash course: modules, controllers, providers, dependency injection, pipes, guards, the whole ex*****on pipeline.

Everything that feels strange about NestJS will click.

2️⃣ Then we build a real project together, a production-style Hackathon API. The kind of backend you can actually put on a resume.

Tech Stack:

- NestJS
- Prisma for the DB
- Better Auth
- Arcjet for security
- And more

If you know Express, you're closer to NestJS than you think.

Grab a coffee and let's dive in! → https://jsm.dev/nestjs-fb-yt

06/22/2026

Three months ago I said AI took the parts of coding I hated and left the parts I love.

A lot of developers told me that was an easy thing to say as a senior.

They weren't wrong.

I didn't have an answer.

So I built one, and last week I gave it on the keynote stage.

The question underneath it:

❓ If AI writes the code, what's left to learn?

AI handles the bottom now.

Syntax, memorization, wiring things up.

So the work moves up.

- Problem framing
- System thinking
- Judging output you can actually explain

The differentiator isn't how much syntax you can recall anymore.

It's how clearly you can communicate intent and connect tech to real outcomes.

There's more to learn now, not less.

The one line I wanted people to leave with:

🚀 It's not seniority that decides who thrives with AI. It's open-mindedness.

I've watched 20-year devs stay stuck and 6-month devs fly, on willingness to think differently alone.

Thank you Amsterdam.

06/06/2026

NEW VIDEO: How Senior Engineers Actually Build with AI in 2026 | Build a Full Stack Job Applications Platform 🚀

Building a project like this usually takes a team of devs at least a month.

I just built it in a few days - without writing a single line of code by hand. And by the end of this video, you'll have built it, too.

I’m showing you exactly how to build JobPilot.

It’s a full-stack AI agent that completely automates the exhausting parts of the job hunt:

✅ Finds jobs, then scores them against your profile.
✅ Deploys real browsers across the web to deeply research the company behind the listing.
✅ Automatically writes your cover letter and tailors your resume to match.

But honestly, the app itself isn't even the best part.

The real value is in the five open-source agent skills I'm giving away:

1️⃣ /architect
2️⃣ /review
3️⃣ /imprint
4️⃣ /recover
5️⃣ /remember

These give your AI agent memory, focus, and the ability to actually ship a project without drifting off course.

That's the actual skill. And it's completely learnable.

You can install them once and use them on literally every project you build moving forward.

Here is the stack we are using to make this project happen:

→ Next.js 16
→ Backend: InsForge
→ Real browser automation: Browserbase & Stagehand
→ Intelligence: GPT-4o
→ Analytics: Posthog

If you know basic , you can follow along.

By the end of this tutorial, you won't just have a working AI agent - you'll have a system for building anything.

A system that doesn't get replaced by the next model, but instead gets stronger every time you use it.

Get started here 👉 https://jsm.dev/jobpilot-fb-yt

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