ai-agent

You-Dont-Know-JS

Name: You-Dont-Know-JS
Author: getify

A book series (2 published editions) on the JS language.

184,804 stars33,379 forksUpdated 2/15/2026100% free · open source

What it does

You-Dont-Know-JS is a free online book series that provides in-depth knowledge of the JavaScript language and its ecosystem

When to use it

•When you need to improve your understanding of JavaScript fundamentals
•When you're looking for a comprehensive resource to learn about JavaScript scope, closures, and async programming
•When you want to deepen your knowledge of JavaScript beyond basic tutorials and online courses

Ready-to-paste prompt

To get started with the book series, open the `book1/chapter1.md` file and begin reading; for example, you can use a command like `cat book1/chapter1.md` to view the file contents

Heads up: Some chapters and examples in the book series assume a basic understanding of JavaScript and programming concepts; if you're completely new to programming, you may need to supplement your learning with additional resources or tutorials

Saves to your device

Use with Claude

New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

⚡ Runs out of the box

A prompt/skill package — nothing to install beyond adding it to your AI tool.

Try it instantly — no install

Claude Code

mkdir -p ~/.claude/skills/you-dont-know-js && curl -fsSL https://workflowstacks.com/api/skills/you-dont-know-js/claude-skill -o ~/.claude/skills/you-dont-know-js/SKILL.md

Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)

claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

Adds a WorkflowStacks connector to Claude Code: search and load any skill here by chatting.

How You-Dont-Know-JS works

Codeflow

Free to inspect

You-Dont-Know-JS is a documents-only repository (56 doc files) — something you read, not something you run. There is nothing to install. Last commit 6 months ago, Other license.

Size

Documents only

56 documents · ~3 h to skim

Setup

Nothing to install

A guide / curated list. Just read it and follow the links.

Runs on

Nowhere — you read it

A reading resource, not a program.

Where to start reading

1
README.md
Start here — what it does and how to install it

What's in each folder

get-started/Folder22 files

scope-closures/Folder19 files

objects-classes/Folder9 files

types-grammar/Folder8 files

.github/CI / automation (GitHub Actions)4 files

es-next-beyond/Folder4 files

external-logos/Folder4 files

sync-async/Folder4 files

READMEDocumentedOther licenseLast update 6 mo ago