Jekyll (software)

Jekyll (software)
Tom Preston-Werner · CC BY 4.0 · source
Name	Jekyll
Caption	Static site generator
Author	Tom Preston-Werner
Developer	GitHub
Released	2008
Programming language	Ruby
Operating system	Cross-platform
Genre	Static site generator
License	MIT License

Jekyll (software) is an open-source static site generator written in Ruby that transforms plain text files into static websites and blogs. Created to integrate with GitHub Pages, it supports content authored in Markdown, Liquid templates, and YAML front matter to produce deployable HTML, CSS, and JavaScript. Jekyll is widely used by developers, designers, and organizations for documentation, blogs, and project sites due to its integration with GitHub, simple workflow, and extensibility.

History

Jekyll was created by Tom Preston-Werner and first announced in 2008 during discussions around GitHub Pages and RubyGems. Early development intersected with projects like Liquid (template engine), which originated at Shopify, and adoption grew as GitHub integrated hosting for static sites. Over time, Jekyll evolved alongside ecosystems such as Bundler, Ruby on Rails, Middleman (software), and static site trends exemplified by Hugo (software) and Gatsby (framework). Milestones include versioned releases aligned with Semantic Versioning practices and the project's stewardship under GitHub engineering and community contributors.

Features

Jekyll provides features for content-centric sites: support for Markdown via parsers like Kramdown and integration with templating via Liquid (template engine), enabling layouts, includes, and filters. It uses YAML front matter for per-page metadata, enabling features similar to front matter in Hugo (software) and data files akin to Data-driven documents. Jekyll supports collections, pagination, permalinks, and asset handling, and can produce RSS/Atom feeds for syndication compatible with aggregators tied to projects like FeedBurner. Security and licensing follow patterns used by projects such as RubyGems and MIT License-licensed software.

Architecture and Design

Jekyll's architecture centers on a build pipeline written in Ruby that reads source files, applies Liquid (template engine) transformations, and outputs static artifacts suitable for serving by NGINX, Apache HTTP Server, or content delivery networks like Cloudflare. The design separates concerns between content (Markdown, HTML) and presentation (layouts, includes), mirroring architectures in Ruby on Rails MVC patterns at a basic level. Configuration via _config.yml follows YAML conventions used in tools such as Ansible and Travis CI configuration files. The plugin API enables extensions to hook into conversion, generation, and rendering phases, conceptually similar to extension points in Jekyll plugins ecosystems and package management seen in Bundler and RubyGems.

Usage and Workflow

Typical workflows begin with a repository hosted on GitHub or other Git providers like GitLab or Bitbucket, using Git workflows established by projects such as Pro Git. Authors write posts in Markdown with YAML front matter, use Liquid to reference layouts and includes, and run Jekyll locally via the Ruby runtime and Bundler to manage dependencies. Continuous deployment pipelines often connect to GitHub Actions, Travis CI, or CircleCI to build and push generated sites to GitHub Pages, Netlify, or Amazon S3 for hosting. Documentation and sites generated by Jekyll are common for projects under organizations such as Linux Foundation, Apache Software Foundation, and corporate docs similar to those of Mozilla or Microsoft.

Plugins and Extensions

Jekyll supports a plugin architecture allowing community-contributed plugins for features like sitemap generation, SEO metadata, and syntax highlighting via libraries such as Rouge (syntax highlighter). Plugin distribution commonly occurs through RubyGems and is managed in project Gemfiles handled by Bundler. Popular plugins and themes draw inspiration from ecosystems around WordPress themes and static tooling like Hugo (software) and Eleventy (software). Compatibility and security considerations echo concerns raised in incidents involving package ecosystems like npm and RubyGems.

Development and Community

Development has been community-driven with contributions from individuals and organizations coordinated via GitHub repositories, issue trackers, and pull requests influenced by practices from projects like Linux kernel and Homebrew (package manager). The community includes maintainers, theme authors, and plugin developers who interact on platforms such as Stack Overflow, Reddit, and event spaces like GitHub Universe or local meetups inspired by RubyConf and RailsConf. Documentation, tutorials, and third-party resources often reference guides from authors and companies like Tom Preston-Werner and blogs maintained by technology organizations including Google Developers and Mozilla Developer Network.

Category:Free software Category:Static site generators