GitBook is a command line tool (and Node.js library) for building beautiful books using GitHub/Git and Markdown. Here is an example: Learn Javascript. You can publish book easily online using gitbook.io and an editor is available for Windows, Mac and Linux. You can follow @GitBookIO on Twitter. Complete documentation is available at help.gitbook.io.

GitBook can be installed from NPM using:

$ npm install gitbook -g

Create the directories and files for a book from its SUMMARY.md file using

$ gitbook init

You can serve a repository as a book using:

$ gitbook serve ./repository

Or simply build the static website using:

$ gitbook build ./repository --output=./outputFolder

Options for commands build and serve are:

-o, --output <directory>  Path to output directory, defaults to ./_book
-f, --format <name>       Change generation format, defaults to site, availables are: site, page, ebook, json
--config <config file>    Configuration file to use, defaults to book.js or book.json

GitBook loads the default configuration from a book.json file in the repository if it exists.

Here are the options that can be stored in this file:

{
    // Folders to use for output
    // Caution: it overrides the value from the command line
    // It's not advised this option in the book.json
    "output": null,

    // Generator to use for building
    // Caution: it overrides the value from the command line
    // It's not advised this option in the book.json
    "generator": "site",

    // Book metadats (somes are extracted from the README by default)
    "title": null,
    "description": null,
    "isbn": null,

    // For ebook format, the extension to use for generation (default is detected from output extension)
    // "epub", "pdf", "mobi"
    // Caution: it overrides the value from the command line
    // It's not advised this option in the book.json
    "extension": null,

    // Plugins list, can contain "-name" for removing default plugins
    "plugins": [],

    // Global configuration for plugins
    "pluginsConfig": {
        "fontSettings": {
            "theme": "sepia", "night" or "white",
            "family": "serif" or "sans",
            "size": 1 to 4
        }
    },

    // Variables for templating
    "variables": {},

    // Links in template (null: default, false: remove, string: new value)
    "links": {
    	// Custom links at top of sidebar
    	"sidebar": {
    	    "Custom link name": "https://customlink.com"
    	},

        // Sharing links
        "sharing": {
            "google": null,
            "facebook": null,
            "twitter": null,
            "weibo": null,
            "all": null
        }
    },


    // Options for PDF generation
    "pdf": {
        // Add page numbers to the bottom of every page
        "pageNumbers": false,

        // Font size for the fiel content
        "fontSize": 12,

        // Paper size for the pdf
        // Choices are [u’a0’, u’a1’, u’a2’, u’a3’, u’a4’, u’a5’, u’a6’, u’b0’, u’b1’, u’b2’, u’b3’, u’b4’, u’b5’, u’b6’, u’legal’, u’letter’]
        "paperSize": "a4",

        // Margin (in pts)
        // Note: 72 pts equals 1 inch
        "margin": {
            "right": 62,
            "left": 62,
            "top": 36,
            "bottom": 36
        },

        //Header HTML template. Available variables: _PAGENUM_, _TITLE_, _AUTHOR_ and _SECTION_.
        "headerTemplate": null,

        //Footer HTML template. Available variables: _PAGENUM_, _TITLE_, _AUTHOR_ and _SECTION_.
        "footerTemplate": null
    }
}

You can publish your books to our index by visiting GitBook.io

GitBook can generate your book in the following formats:

• Static Website: This is the default format. It generates a complete interactive static website that can be, for example, hosted on GitHub Pages.
• eBook: A complete eBook with exercise solutions at the end of the book. You need to have ebook-convert installed. You can specify the eBook filename with the -o option, otherwise book will be used.
  • Generate a PDF using: gitbook pdf ./myrepo
  • Generate a ePub using: gitbook epub ./myrepo
  • Generate a MOBI using: gitbook mobi ./myrepo
• JSON: This format is used for debugging or extracting metadata from a book. Generate this format using: gitbook build ./myrepo -f json.

A book is a Git repository containing at least 2 files: README.md and SUMMARY.md.

Typically, this should be the introduction for your book. It will be automatically added to the final summary.

The SUMMARY.md defines your book's structure. It should contain a list of chapters, linking to their respective pages.

Example:

# Summary

This is the summary of my book.

* [section 1](section1/README.md)
    * [example 1](section1/example1.md)
    * [example 2](section1/example2.md)
* [section 2](section2/README.md)
    * [example 1](section2/example1.md)

Files that are not included in SUMMARY.md will not be processed by gitbook.

GitBook supports building books written in multiple languages. Each language should be a sub-directory following the normal GitBook format, and a file named LANGS.md should be present at the root of the repository with the following format:

* [English](en/)
* [French](fr/)
* [Español](es/)

You can see a complete example with the Learn Git book.

Allows you to specify terms and their respective definitions to be displayed in the glossary. Based on those terms, gitbook will automatically build an index and highlight those terms in pages.

The GLOSSARY.md format is very simple :

# term
Definition for this term

# Another term
With it's definition, this can contain bold text and all other kinds of inline markup ...

GitBook will read the .gitignore, .bookignore and .ignore files to get a list of files and folders to skip. (The format inside those files follows the same convention as .gitignore).

Best practices for the .gitignore is to ignore build files from node.js (node_modules, ...) and build files from GitBook: _book, *.epub, *.mobi and *.pdf (Download GitBook.gitignore).

A cover image can be set by creating a file: /cover.jpg. The best resolution is 1800x2360. The generation of the cover can be done automatically using the plugin autocover.

A small version of the cover can also be set by creating a file: /cover_small.jpg.

The platform GitBook.io is like an "Heroku for books": you can create a book on it (public, paid, or private) and update it using git push.

Plugins can be used to extend your book's functionality. Read GitbookIO/plugin for more information about how to build a plugin for GitBook.

Plugins needed to build a book can be installed using: gitbook install ./.

You can use the environment variable DEBUG=true to get better error messages (with stack trace). For example:

$ export DEBUG=true
$ gitbook build ./