Plugins allow you to extend Jekyll’s behavior to fit your needs. There are six types of plugins in Jekyll.
Generators create content on your site. For example:
Converters change a markup language into another format. For example:
Commands extend the
jekyll executable with
subcommands. For example:
Tags create custom Liquid tags. For example:
Filters create custom Liquid filters. For example:
Hooks give fine-grained control to extend the build process.
There are two flags to be aware of when writing a plugin:
A boolean flag that informs Jekyll whether this plugin may be safely
executed in an environment where arbitrary code execution is not
allowed. This is used by GitHub Pages to determine which core plugins
may be used, and which are unsafe to run. If your plugin does not
allow for arbitrary code execution, set this to
This flag determines what order the plugin is loaded in. Valid values
To use one of the example plugins above as an illustration, here is how you’d specify these two flags:
module Jekyll class UpcaseConverter < Converter safe true priority :low ... end end
The guides help you with the specifics of creating plugins. We also have some recommended best practices to help structure your plugin.
We recommend using a gem for your plugin. This will help you manage dependencies, keep separation from your site source code and allow you to share functionality across multiple projects. For tips on creating a gem take a look a the Ruby gems guide or look through the source code of an existing plugin such as jekyll-feed.