ai-agent

You Dont Know JS

Name: You Dont Know JS
Author: getify

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

184,665 stars33,441 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

Install / run

Since You-Dont-Know-JS is a book series, there is no installation command; instead, visit the GitHub repository at https://github.com/getify/You-Dont-Know-JS and clone or download the repository to access the books

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

Quick start

1Clone the repository using the command `git clone https://github.com/getify/You-Dont-Know-JS.git`
2Open the `book1` directory to access the first book, 'Up & Going'
3Read the `README.md` file in the `book1` directory to get started with the book
4Explore the `book2` directory to access the second book, 'Scope & Closures'
5Use a Markdown viewer or editor to read the book files, such as `chapter1.md`

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

Topics

async

book

book-series

closures

education

es2015

es6

javascript

learn-to-code

programming

prototypes

training-materials

training-providers

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