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MDN Web Docs

Data and tools related to MDN Web Docs (formerly Mozilla Developer Network, formerly Mozilla Developer Center...)

👋 Welcome, Bienvenue, ようこそ, 환영합니다, Bienvenido, Bem-vindos, Добро пожаловать, 欢迎, 歡迎, أهلا

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MDN Web Docs is an open-source, collaborative project that documents web platform technologies, including CSS, HTML, JavaScript, and Web APIs. We also provide extensive 🧑‍🎓 learning resources for beginning developers and students.

Note: By participating in and contributing to our projects and discussions, you acknowledge that you have read and agree to the Mozilla community participation guidelines.

🙌 MDN's mission

MDN's mission is to provide a blueprint for a better internet and empower a new generation of developers and content creators to build it.

The power of MDN Web Docs lies in its vast community of active readers and contributors. Since 2005, approximately 45,000 contributors have created the documentation we know and love. Together, contributors have created over 45,000 documents that make up an up-to-date, comprehensive, and free resource for web developers worldwide. In addition to English-language articles, over 35 volunteers lead translation and localization efforts for Chinese, French, Japanese, Korean, Portuguese, Russian, and Spanish.

🤝 Be part of MDN Web Docs

You can be part of MDN Web Docs, whether it be through ✍️ content contributions, ⚙️ engineering, or ↔️ translation work. The MDN Web Docs project welcomes contributions from everyone who shares our goals and wants to contribute constructively and respectfully within our community. 🧘‍♂️

🌎 Our community

We're proud to have a global community of contributors and developers, who also want to say 👋

స్వాగతం സ്വാഗതം Merhaba خوش آمدید
स्वागत है Selamat Datang வணக்கம் მოგესალმებით
Ласкаво просимо مرحباً خوش آمدی স্বাগতম
Dobro došli שלום Добре дошли 환영합니다

✉️ Get in touch

You can ask questions or get in touch with the MDN Web Docs team and community through any of our communication channels.

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  1. content content Public

    The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

    Markdown 9.9k 23k

  2. fred fred Public

    MDN's frontend since late 2025, built with Web Components, Lit, and SSR for a fast, clean documentation experience. Fred = /fr(ont)e(n)d/.

    JavaScript 60 24

  3. rari rari Public

    Rari is a Rust-based build system that transforms markdown into structured JSON, powering MDN Web Docs content and translations since 2024.

    Rust 29 22

  4. browser-compat-data browser-compat-data Public

    Browser compatibility data for Web technologies as displayed on MDN

    JSON 5.5k 2.4k

  5. translated-content translated-content Public

    7 community-maintained translations of MDN Web Docs in ES, FR, JA, KO, PT-BR, RU, and ZH, to learn and contribute in your native language.

    Markdown 1.9k 8.3k

  6. mdn mdn Public

    Planning and proposals for MDN Web Docs content

    1.3k 185

Repositories

Showing 10 of 133 repositories
  • content Public

    The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

    mdn/content’s past year of commit activity
    Markdown 9,876 22,975 301 (97 issues need help) 65 Updated Dec 9, 2025
  • browser-compat-data Public

    Browser compatibility data for Web technologies as displayed on MDN

    mdn/browser-compat-data’s past year of commit activity
    JSON 5,519 CC0-1.0 2,431 467 (6 issues need help) 51 Updated Dec 9, 2025
  • fred Public

    MDN's frontend since late 2025, built with Web Components, Lit, and SSR for a fast, clean documentation experience. Fred = /fr(ont)e(n)d/.

    mdn/fred’s past year of commit activity
    JavaScript 60 MPL-2.0 24 129 24 Updated Dec 9, 2025
  • yari Public

    The platform code behind MDN Web Docs

    mdn/yari’s past year of commit activity
    TypeScript 1,270 MPL-2.0 544 2 (1 issue needs help) 2 Updated Dec 9, 2025
  • mcp Public

    MDN's prototype MCP server

    mdn/mcp’s past year of commit activity
    JavaScript 4 MPL-2.0 0 0 1 Updated Dec 9, 2025
  • curriculum Public

    MDN front-end developer curriculum

    mdn/curriculum’s past year of commit activity
    TeX 375 47 3 1 Updated Dec 9, 2025
  • client-toolchain-example Public

    Demo project for the MDN client-side web development tools tutorial.

    mdn/client-toolchain-example’s past year of commit activity
    JavaScript 4 0 0 0 Updated Dec 9, 2025
  • mdn-http-observatory Public

    Backend for HTTP Observatory on MDN

    mdn/mdn-http-observatory’s past year of commit activity
    JavaScript 97 MPL-2.0 23 13 3 Updated Dec 9, 2025
  • rari Public

    Rari is a Rust-based build system that transforms markdown into structured JSON, powering MDN Web Docs content and translations since 2024.

    mdn/rari’s past year of commit activity
    Rust 29 22 38 7 Updated Dec 9, 2025
  • translated-content Public

    7 community-maintained translations of MDN Web Docs in ES, FR, JA, KO, PT-BR, RU, and ZH, to learn and contribute in your native language.

    mdn/translated-content’s past year of commit activity
    Markdown 1,926 8,310 162 (16 issues need help) 119 Updated Dec 9, 2025