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Best GitHub Repositories to Learn JavaScript

Top GitHub repositories to master JavaScript — covering core concepts, ES6+, algorithms, and the “hard parts” of the language. These free, open-source repos are among the most starred learning resources on GitHub.

13 repositories

You-Dont-Know-JS

getify

180k+IntermediateJavaScript

A deep book series on how JS really works

A free book series diving deep into the core mechanisms of JavaScript, from scope to async.

What you get

Six in-depth books, free to read
Clear explanations of tricky concepts
A reference you return to for years

What you'll learn

Scope, closures, and the “this” keywordTypes, coercion, and grammarAsync, promises, and generators

Best for: Developers who want to truly understand JavaScript, not just use it.

View on GitHub

javascript-algorithms

trekhleb

185k+IntermediateJavaScriptInterview

Algorithms & data structures in JavaScript

Algorithms and data structures implemented in JavaScript with explanations and links to further reading.

What you get

Annotated algorithm implementations
Big-O notes for each entry
Beginner and advanced sections

What you'll learn

Core data structures in JSSorting, searching, graph, and DP algorithmsComplexity analysis

Best for: Front-end and Node developers prepping for coding interviews.

View on GitHub

33-js-concepts

leonardomso

64k+BeginnerJavaScriptBeginner-friendly

33 concepts every JS developer should know

A curated list of 33 fundamental JavaScript concepts with curated articles and videos for each.

What you get

A clear checklist of must-know topics
Best external resources per concept
A structured self-study path

What you'll learn

Call stack, event loop, and hoistingClosures, prototypes, and “this”Functional and async patterns

Best for: Self-taught developers filling knowledge gaps.

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clean-code-javascript

ryanmcdermott

90k+IntermediateJavaScript

Clean Code principles adapted for JS

Software-engineering “Clean Code” principles translated into practical JavaScript examples.

What you get

Before/after code comparisons
Actionable refactoring guidance
A shared team style reference

What you'll learn

Naming, functions, and SOLID basicsHow to write readable, testable JSCommon code smells and fixes

Best for: Developers wanting to write more maintainable code.

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javascript

airbnb

146k+IntermediateJavaScript

Airbnb’s JavaScript style guide

The widely adopted Airbnb JavaScript style guide explaining how to write consistent JS.

What you get

Industry-standard conventions
Rule-by-rule rationale
Lint-ready guidance

What you'll learn

Consistent code styleModern ES practicesTeam conventions

Best for: Teams standardizing JavaScript style.

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javascript-questions

lydiahallie

64k+IntermediateJavaScriptInterview

Tricky JS questions with explanations

A long list of JavaScript multiple-choice questions with detailed explanations.

What you get

Concept-testing questions
Clear answer explanations
Many translations

What you'll learn

Edge cases and gotchasHow the engine behavesDeep language understanding

Best for: Developers preparing for JS interviews.

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Eloquent-JavaScript

marijnh

11k+BeginnerJavaScriptBeginner-friendly

The source of a classic free JS book

The source for “Eloquent JavaScript”, a beloved free book teaching JS from the ground up.

What you get

A complete free book
Interactive exercises
Beginner-to-advanced flow

What you'll learn

Programming fundamentalsJavaScript and the DOMNode basics

Best for: Beginners who want a thorough book.

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project-guidelines

elsewhencode

30k+IntermediateMarkdown

A guide to building JS projects well

A set of best practices for managing real-world JavaScript projects.

What you get

Project workflow guidance
Git and dependency tips
Structure recommendations

What you'll learn

Project organizationBranching and CI basicsMaintainable workflows

Best for: Developers running team JS projects.

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awesome-javascript

sorrycc

33k+BeginnerMarkdownBeginner-friendly

A curated list of JS libraries & tools

A curated collection of awesome browser-side JavaScript libraries, resources, and tools.

What you get

Categorized libraries
Tooling and resources
Ecosystem overview

What you'll learn

The JS ecosystemWhich tools to useWhere to explore next

Best for: JS developers surveying the ecosystem.

View on GitHub

javascript-quiz

sudheerj

29k+IntermediateJavaScriptInterview

1000+ JavaScript interview questions

A large bank of JavaScript interview questions with code answers.

What you get

Hundreds of Q&A
Code examples
Topic organization

What you'll learn

Core JS for interviewsTricky behaviorsES features

Best for: Candidates revising JS for interviews.

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wtfjs

denysdovhan

36k+IntermediateJavaScript

A list of funny and tricky JS examples

A collection of surprising JavaScript behaviors, explained.

What you get

Edge-case examples
Clear explanations
Deeper language insight

What you'll learn

Coercion and quirksWhy JS behaves oddlyDefensive coding

Best for: Devs who want to truly understand JS.

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nodebestpractices-js

goldbergyoni

102k+IntermediateJavaScript

Node.js best practices for JS devs

A curated set of Node.js best practices useful for any JavaScript backend developer.

What you get

Production guidance
Code examples
Security tips

What you'll learn

Robust JS backendsError handlingPerformance

Best for: JS devs writing server code.

View on GitHub

modern-js-cheatsheet

mbeaudru

24k+BeginnerMarkdownBeginner-friendly

A cheatsheet for modern JavaScript

A cheatsheet explaining modern JavaScript features used in today’s codebases.

What you get

Modern syntax explained
Examples for each feature
A quick reference

What you'll learn

ES6+ featuresDestructuring and asyncModern idioms

Best for: Developers modernizing their JS.

View on GitHub

Frequently asked questions

What is the best GitHub repo to learn JavaScript?

getify/You-Dont-Know-JS is the most respected deep-dive into how JavaScript truly works. For algorithms, trekhleb/javascript-algorithms is the top choice.

How do I learn modern JavaScript on GitHub?

Follow repos like 33-js-concepts and javascript-algorithms. They explain ES6+, closures, async, and data structures with runnable examples.

Are these JavaScript repos free?

Yes — every repository listed is open source and free to read, clone, and learn from.

Explore more categories

🐍 Python ⚛️ React 🏗️ System Design 🧮 Data Structures & Algorithms 🤖 Machine Learning 🧠 LLM & Generative AI

Pair these with our learning roadmaps, free courses, and notes library.

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Frequently asked questions

What is the best GitHub repo to learn JavaScript?

getify/You-Dont-Know-JS is the most respected deep-dive into how JavaScript truly works. For algorithms, trekhleb/javascript-algorithms is the top choice.

How do I learn modern JavaScript on GitHub?

Follow repos like 33-js-concepts and javascript-algorithms. They explain ES6+, closures, async, and data structures with runnable examples.

Are these JavaScript repos free?

Yes — every repository listed is open source and free to read, clone, and learn from.