Sign in

CJ

@w3cj.com
4K followers 1.6K following 205 posts

Full Stack Dev, Explainer of Things Senior Creator at @syntax.fm / @sentry.io Host of coding.garden on Twitch and YouTube

PostsRepliesMedia
Reposted by CJ
Syntax @syntax.fm · 28/09/2026
The Syntax crew is LIVE to chat how Ruby on Rails is Dead, Zuck cooked with Muse, upm the tiny npm replacement and more! See you in the chat. www.youtube.com/watch?v=Z412... www.twitch.tv/syntaxfm
youtube.com
Ruby on Rails is Dead ⟡ Zuck cooked with Muse ⟡ upm is a tiny npm replacement ⌁ Syntax Weekly ⌁
YouTube video by Syntax
071
Reposted by CJ
Syntax @syntax.fm · 21/09/2026
The Syntax crew is LIVE to chat about Jev! Is the Hype Overblown? Also Claude shipped AGENTS md support, TinyCast is a smaller Raycast and more! See you in the chat. youtube.com/watch?v=rsp5... twitch.tv/syntaxfm
youtube.com
Is the Jev Hype Overblown? ⟡ Claude AGENTS.md support ⟡ TinyCast smaller Raycast ⌁ Syntax Weekly ⌁
YouTube video by Syntax
041
CJ @w3cj.com · 18/09/2026
Code for jev chat is available here: github.com/w3cj/jev-chat The README includes a breakdown of how this all works and includes an FAQ.
github.com
GitHub - w3cj/jev-chat: A tool calling chat bot built with Jev and no LLM.
A tool calling chat bot built with Jev and no LLM. - w3cj/jev-chat
0191
CJ @w3cj.com · 17/09/2026
Jev is an extremely cheap and fast classifier that can replace long LLM prompts in your workflows with more deterministic answers and actions. I break down what that means, how it works and show several demos of Jev in action in my latest video. www.youtube.com/watch?v=QbYB...
youtube.com
wtf is jev?
YouTube video by Syntax
3626
CJ @w3cj.com · 28/08/2026
We're at a point where coding without an isolation mechanism or sandbox is way too risky. Use containers at a minimum, VMs if you have enough resources or a remote machine with either of these if you can. Watch 🍿: www.youtube.com/watch?v=-ulR...
3353
CJ @w3cj.com · 14/08/2026
A must watch for anyone using AI to code.
0102
Reposted by CJ
Syntax @syntax.fm · 10/08/2026
We're LIVE to chat about how an AI assistant hacked a gym, a $9k cloudflare bill, a new unlimited use AI sub service and more! See you in the chat. www.youtube.com/watch?v=HrNL... twitch.tv/syntaxfm
youtube.com
AI Assistant Hacks Gym ⟡ $9k Cloudflare Bill ⟡ Unlimited Use AI Subs ⌁ Syntax Weekly ⌁
YouTube video by Syntax
031
Reposted by CJ
Syntax @syntax.fm · 04/08/2026
The Syntax crew is LIVE to chat about the new cloudflare wallets, a NEW react compiler, an active npm supply chain attack and more! See you in the chat! www.youtube.com/watch?v=KNF4...
youtube.com
Cloudflare Wallets ⟡ A REAL React Compiler Released ⌁ Syntax Weekly ⌁
YouTube video by Syntax
091
Reposted by CJ
Scott Tolinski @tolin.ski · 31/07/2026
I’m exploring the mental health effects of AI coding. This is a super quick (blazing fast), anonymous survey. Please fill out and share so that the responses will be well rounded. forms.gle/dpD8Tk1QnXAz...
forms.gle
AI Coding & Mental Health
All answers are anonymous.
1810964
CJ @w3cj.com · 31/07/2026
There are a lot of questions and misconceptions about open weight models. I break it all down here so even nontechnical folks can understand. www.youtube.com/watch?v=a-Lj...
youtube.com
Open Weight AI Models Explained for Everyone
YouTube video by Syntax
1173
CJ @w3cj.com · 28/07/2026
LLM tool calls explained, excerpt from my video "I Built an LLM From Scratch"
1123
Reposted by CJ
Syntax @syntax.fm · 27/07/2026
We're LIVE to chat about the Hugging Face Hack, the React compiler was ported to Rust, there's a new Rust based full stack framework called topcoat and more! See you in the chat. youtube.com/watch?v=A_Mr... www.twitch.tv/syntaxfm/
youtube.com
OpenAI Agent Hacks Hugging Face ⟡ React Compiler Ported to Rust ⟡ Rust Full Stack ⌁ Syntax Weekly
YouTube video by Syntax
041
CJ @w3cj.com · 24/07/2026
The full pipeline of LLMs explained, excerpt from my video "I Built an LLM From Scratch"
1203
CJ @w3cj.com · 17/07/2026
The output of a transformer (LLM) is a score (logit) for every possible next token. We then use temperature, softmax, top-p and sampling to choose the next token, excerpt from my video "I Built an LLM From Scratch"
2182
CJ @w3cj.com · 16/07/2026
The transformer architecture that powers modern LLMs explained, excerpt from my video "I Built an LLM From Scratch"
1123
CJ @w3cj.com · 16/07/2026
AI is stealing from you. www.youtube.com/watch?v=mudi...
youtube.com
AI Is Stealing From You
YouTube video by Syntax
0115
CJ @w3cj.com · 15/07/2026
Token embeddings explained, excerpt from my video "I Built an LLM From Scratch"
0141
CJ @w3cj.com · 14/07/2026
Tokenization explained, excerpt from my video "I Built an LLM From Scratch"
2111
CJ @w3cj.com · 13/07/2026
A brief history of neural networks, excerpt from my video "I Built an LLM From Scratch"
1164
CJ @w3cj.com · 10/07/2026
I built an LLM from scratch. Here's everything I learned along the way.
2535
Reposted by CJ
Syntax @syntax.fm · 06/07/2026
Do you still read the code? We're live to chat about it as well as a NEW HTTP Method, Codex Sol Ultra and much more. See you in the chat. www.youtube.com/watch?v=6F0J... www.twitch.tv/syntaxfm/
youtube.com
Do You Read The Code? ⟡ HTTP Gets a NEW Method ⟡ Codex Gets Sol Ultra ⌁ Syntax Weekly ⌁
YouTube video by Syntax
141
Reposted by CJ
Syntax @syntax.fm · 26/06/2026
The definitive web tech tier list. www.youtube.com/watch?v=-S_Y...
youtube.com
You're gonna hate this tier list.
YouTube video by Syntax
261
Reposted by CJ
Syntax @syntax.fm · 28/05/2026
We're LIVE to chat about Opus 4.8, Herdr (a better tmux), how AI is killing the small web and more! See you in the chat! www.youtube.com/watch?v=tePe... www.twitch.tv/syntaxfm/
youtube.com
Opus 4.8! ⟡ Goodbye tmux, Hello Herdr ⟡ AI Killing the Small Web ⌁ Syntax Weekly ⌁
YouTube video by Syntax
042
Reposted by CJ
Syntax @syntax.fm · 02/04/2026
🏆🏆🏆STARTING NOW🏆🏆🏆 www.youtube.com/watch?v=7rOU...
youtube.com
One Last Battle
YouTube video by Syntax
0265
Reposted by CJ
Syntax @syntax.fm · 27/03/2026
STARTING IN 30 MINUTES @tolin.ski vs Kyle @joshwcomeau.com vs @wesbos.com www.youtube.com/watch?v=RNp1...
youtube.com
16 Pro Web Devs Compete with CSS | Round 4 | Semi Finals
We brought 16 of the worlds best CSS developers to compete head to head. https://www.madcss.com Play it here: synhax.syntax.fm Follow / subscribe to all of our featured competitors: Josh…
2204
Reposted by CJ
Syntax @syntax.fm · 26/03/2026
AI coding still sucks but @w3cj.com is getting value out of it in other ways. www.youtube.com/watch?v=AMnQ...
youtube.com
AI Coding Still Sucks (without validation)
YouTube video by Syntax
092
Reposted by CJ
Syntax @syntax.fm · 20/03/2026
Starting in 15 minutes ‼️🧑‍💻🏀 www.youtube.com/watch?v=YZZb...
youtube.com
The Internet’s Best Web Devs Compete in CSS | Quarter Finals
We brought 16 of the worlds best CSS developers to compete head to head. https://www.madcss.com Follow / subscribe to all of our featured competitors: Kevin Powell @KevinPowell …
2144
CJ @w3cj.com · 12/03/2026
Here's my guide to the local AI landscape. Hardware, setup and models. I also give my overall impressions after using local models for the past few weeks. Watch: 🍿 www.youtube.com/watch?v=QKdK...
youtube.com
You Guide To Local AI | Hardware, Setup and Models
YouTube video by Syntax
1262
CJ @w3cj.com · 06/03/2026
So stoked for this! Don't forget to tune in to the premiere in about 40 minutes!
070
CJ @w3cj.com · 05/03/2026
MADCSS DOT COM MADCSS DOT COM MADCSS DOT COM MADCSS DOT COM Tune in March 6th 10AM ET
060
CJ @w3cj.com · 04/03/2026
ITS HAPPENING!!!! Get your bracket picks in before it starts!
070
CJ @w3cj.com · 02/03/2026
Who do you think will win the March MadCSS tournament? Fill out your bracket before March 6th for a chance to win some really dope stuff: madcss.com
A photo of all the things you can win if you win the MadCSS bracket challenge. $1500 worth of stuff for first prize including one of every single thing from the syntax store, one of all the MadCSS exclusive merch AND a $69 taco bell gift card.A photo of the MadCSS tournament bracket. Including all 16 participants and all 8 round 1 match ups.
030
CJ @w3cj.com · 02/03/2026
If you were building a full stack JS framework from scratch today, what would you add that is missing from Next.js, SvelteKit, Nuxt, Tanstack Start and Solid Start?
870
CJ @w3cj.com · 25/02/2026
The lack of route level middleware in Next.js has always bugged me. Claude added the feature to vinext in under an hour! Unlikely to be merged in but vinext being vite based makes things like this possible! Code: github.com/w3cj/vinext/... Demo: vinext-route-proxy-examples.cj-syntax.workers.dev
github.com
Add route level proxy by w3cj · Pull Request #1 · w3cj/vinext
vinext currently only supports a single top-level proxy.ts/middleware.ts that runs before all routes — the same limitation as Next.js. Users must use matcher patterns and if/else to scope logic to ...
1100
CJ @w3cj.com · 10/02/2026
I have been using SearXNG as my daily driver search engine and it's been great! I show what it is and how to set it up in my latest video I also take a look at Perplexica - a self hosted AI answer engine that uses SearXNG under the hood watch 🍿: www.youtube.com/watch?v=9pNM...
youtube.com
search results suck right now, use THIS instead
YouTube video by Syntax
2305
CJ @w3cj.com · 17/01/2026
🄳🄴🄽🅅🄴🅁 🄸🄽🅃🄴🅁🄽🄰🅃🄸🄾🄽🄰🄻 🄰🄸🅁🄿🄾🅁🅃 🄰🅄🅃🄾🄼🄰🅃🄴🄳 🄶🅄🄸🄳🄴🅆🄰🅈 🅃🅁🄰🄽🅂🄸🅃 🅂🅈🅂🅃🄴🄼
The last car on The Denver International Airport Automated Guideway Transit System at night with no passengers. The ceiling lights are orange and blue. The train tunnel can be seen out of the window.
5390
CJ @w3cj.com · 15/01/2026
dev containers are amazing i slept on them way too long i show everything you need to know to get started in my latest video: www.youtube.com/watch?v=kPMA...
youtube.com
you should be using dev containers
YouTube video by Syntax
1271
CJ @w3cj.com · 15/01/2026
i created a dev container firewall feature that makes it super easy to lock down the network inside a dev container includes tons of allow lists like Github APIs / npm registry as well as AI APIs / tools this devcontainer.json is all you need for running sand-boxed claude code
example devcontainer.json with claude code and firewall
1110
CJ @w3cj.com · 09/01/2026
watch me try to break a world record www.youtube.com/watch?v=3NCN...
youtube.com
writing javascript as fast as possible
YouTube video by Syntax
1183
CJ @w3cj.com · 30/12/2025
the best programmers are the ones that can adapt and constantly learn / progress while everything is changing around them for me, 2026 will be the year of "just enough AI"™️, less hype, less FOMO, more building / shipping www.youtube.com/watch?v=e-_7...
youtube.com
feeling behind as a programmer
YouTube video by Syntax
0240
CJ @w3cj.com · 17/12/2025
File extensions and file paths being considered "advanced" is crazy to me. Modern OS's hide these by default and the lack of computer literacy here is a real problem for new devs especially vibe coders.
3312
CJ @w3cj.com · 16/12/2025
Whether you've been tricked into becoming a programmer (by AI) or are intentionally looking to dive into the world of computers and programming, my latest video will get you started. Watch 🍿: www.youtube.com/watch?v=z8bl...
youtube.com
oops, you're a programmer now | a guide
YouTube video by Syntax
0181
CJ @w3cj.com · 12/12/2025
I'm live over on @syntax.fm to work on the @sentry.io Debug December challenges. www.debugdecember.com Tune in everywhere you get your live streams. twitch.tv/syntaxfm www.youtube.com/watch?v=8f8G... See you in the chat.
youtube.com
Working on Debug December Days 6 - 12 | Syntax Bytes w/ CJ
YouTube video by Syntax
060
CJ @w3cj.com · 12/12/2025
I'm working on moving my dev environment fully to a VM or container. Any tips / tools I should look into? I basically never want to run npm install or compile binaries on my local machine ever again.
6140
CJ @w3cj.com · 09/12/2025
building todo apps is so hard these days scaffolded a new app, tried to start it, promise error, tried to apply db migrations, could not locate the sqlite bindings file, tried to build sqlite, node gyp compile error, re-installing xcode command line tools, ETA 23 minutes
5210
Reposted by CJ
Syntax @syntax.fm · 05/12/2025
CJ is live to solve the @sentry.io Debug December Day 1 - 5 challenges. twitch.tv/syntaxfm www.youtube.com/watch?v=ICBK... See you in the chat.
twitch.tv
syntaxfm - Twitch
Debug December | Days 1 - 5 | Syntax Bytes w/ CJ
072
Reposted by CJ
Syntax @syntax.fm · 04/12/2025
In his latest video, @w3cj.com explains how he solved Advent of Code Day 3 and Day 4 with JavaScript / TypeScript. Watch 🍿: youtu.be/PVbLd6zOVhg
youtu.be
Advent of Code | Day 3 and Day 4 Explained | JavaScript / TypeScript
YouTube video by Syntax
041
CJ @w3cj.com · 04/12/2025
I'm LIVE on twitch to do Advent of Code Day 3 && 4. See you in the chat - www.twitch.tv/codinggarden
twitch.tv
CodingGarden - Twitch
[TS] Advent of Code Day 3 && 4 | !faq | !commands
091
Reposted by CJ
Syntax @syntax.fm · 03/12/2025
Should CJ start an ASMR channel? Yes or Hell Yes?
0111
CJ @w3cj.com · 03/12/2025
Check out my POV from the "Order Pizza With Code" @syntax.fm challenge. Watch 🍕: www.youtube.com/watch?v=LBQv...
youtube.com
Order A Pizza With CODE | Reverse Engineering
YouTube video by Coding Garden
091