JavaScript Mastery, Los Angeles, CA (2026)

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

05/15/2026

NEW VIDEO: How to Actually Build Mobile Apps with AI in 2026 | A Complete Beginner's Tutorial 🔥

In this video, you're going to build a full Duolingo clone in React Native, using AI the whole way through.

You won't write a single line of manual code, but you also won't yolo prompts and hope it works.

I'm calling it 'Practical Vibe Coding':

→ App framework powered by React Native & Expo
→ Social authentication & user management with Clerk
→ Talk out loud to a real-time AI teacher with Stream
→ Product analytics and tracking with PostHog
→ Every AI-generated pull request reviewed with CodeRabbit
→ Styled with NativeWind
→ State management handled by Zustand

The app isn't the point, the workflow is.

Use this on anything you build next.

Grab your coffee. Let's go.

➡️ https://jsm.dev/fb-yt-lingua

05/01/2026

I just built a full SaaS app without writing a single line of code.

AI agents handled the implementation.

I focused on the system design.

That’s the real shift happening right now.

The gap isn’t tools. It’s how you think.

If you’ve ever had an AI project start great and then fall apart, you’ll get this.

I broke down the full process here: https://jsm.dev/fb-yt-ghost

04/18/2026

NEW YOUTUBE VIDEO: Do you actually need to learn another JavaScript framework to get hired? This time… yes! 🔥

I just dropped a two-part video tutorial:

1️⃣ A FREE 3-hour TanStack Start crash course
2️⃣ Build and deploy a Full-Stack Marketplace App with TanStack Start

Here’s why this one matters 👇

Every major infra company is betting on TanStack Start.

Cloudflare, Netlify, Clerk, Neon are all building first-class integrations.

That's not marketing. That's infrastructure companies choosing where their devs will be in 2 years.

That’s a signal! ✅

TanStack Start fixes what other frameworks made painful:

❌ Hydration errors → gone
❌ “use client / use server” confusion → gone
❌ Vendor lock-in → gone (deploy anywhere JS runs)

You keep the React mental model - without the ceremony.

In this video, you’ll learn:

✅ Request lifecycle (what’s actually happening)
✅ File-based routing (dynamic, splat, pathless layouts)
✅ Loaders vs useEffect (and why it matters)
✅ Server functions (built-in RPC, no tRPC install)
✅ API routes for webhooks
✅ SEO + metadata

Then, you'll build 'Skilled' - a Full-Stack Agent Skills Marketplace using:

→ TanStack Start + Router + Query (the full ecosystem!)
→ React 19
→ TypeScript
→ Tailwind CSS
→ Clerk
→ Firebase Data Connect
→ PostHog
→ CodeRabbit

From empty folder... to deployed app! 🔥

If you want to go further, the PRO course is live TODAY. It picks up where the video ends:

→ Submit page with Zod + server mutations
→ Streaming search
→ SSR detail pages
→ Optimistic bookmarking
→ Route masking, middleware, caching internals
→ Testing, error boundaries, production deploy

Grab it here → https://jsm.dev/fb-tanstack-pro-course

‼️ Day Zero pricing is live for 7 days ONLY!

This is the lowest price it’ll ever be. You get lifetime access PLUS direct input on what lessons get built next.

After 7 days, the price goes up. After the course ships complete, it goes up again. 😱

ALSO: Grab our free 60-page TanStack ebook to go with it → https://jsm.dev/fb-tanstack-ebook

👀 Watch the video.
📚 Read the ebook.
🛳️ Ship something real.

That’s it!

Let’s build → https://jsm.dev/fb-yt-tanstack

JavaScript Mastery

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