Eleventy

Eleventy
Name	Eleventy
Developer	Zach Leatherman
Initial release	2017
Programming language	JavaScript
Platform	Node.js
License	MIT License

Eleventy

Eleventy is a static site generator created to build fast, flexible, and minimal web sites using familiar templating languages. It aims to provide a simple workflow for developers accustomed to Node.js, JavaScript, and a variety of templating syntaxes while integrating into ecosystems that include GitHub Pages, Netlify, and Vercel. The project has a community of contributors and adopters spanning individual creators, open source organizations, and enterprises.

Overview

Eleventy is a command-line driven static site generator implemented in JavaScript that runs on Node.js. It emphasizes a file-based approach similar to projects developed with Jekyll, Hugo, and Gatsby while retaining compatibility with template languages such as Nunjucks, Liquid, Mustache, EJS, and Handlebars. The design favors minimal abstractions and a flat learning curve for developers coming from tools like Webpack, Rollup (software), Parcel (software), and Babel (toolchain). Its maintainer-centric governance model parallels patterns seen in communities around React (library), Vue.js, and Svelte.

Features

Eleventy supports multiple templating engines concurrently, letting projects mix files using Markdown, Nunjucks, Liquid, Mustache, EJS, and other syntaxes. It implements a data cascade pattern that merges front matter from files, global data files, and environment-specific settings similar to strategies used by Jekyll and Hugo. Built-in features include incremental build support comparable to Snowpack and Vite (software), a flexible permalink system echoing Hexo conventions, and support for asset pipelines that integrate with PostCSS, Sass, and bundlers like Webpack. Eleventy’s configuration system accepts custom filters, shortcodes, and transforms, allowing extensions analogous to plugins available for Gatsby and Next.js.

Installation and Setup

Installation typically uses npm or Yarn to add Eleventy as a devDependency in a package.json-managed project. A basic setup resembles workflows from Create React App or Vue CLI: initialize a repository, install dependencies, add scripts for build and serve tasks, and create source directories for content and templates. Developers frequently combine Eleventy with continuous integration services such as GitHub Actions, CircleCI, and Travis CI to automate builds and deploy artifacts to platforms including Netlify, Vercel, and GitHub Pages. Starter kits and boilerplates inspired by Starter templates from ecosystems like Gatsby and Hugo streamline onboarding.

Templating and Data Cascade

Eleventy’s templating model allows developers to author content in Markdown enhanced by front matter in formats like YAML, JSON, and TOML. The data cascade merges directory-level data files, global data modules, and per-page front matter, mirroring approaches from Jekyll and Hugo but with the ability to use JavaScript functions to compute data at runtime. Template inheritance and includes use mechanisms provided by engines such as Nunjucks and Liquid, enabling layout composition comparable to patterns in Django templates and Twig. Advanced use cases employ computed data, pagination, and collections—concepts familiar to users of Pelican (static site generator) and Middleman.

Plugins and Extensions

Eleventy supports community plugins that add functionality for tasks like image optimization, RSS feed generation, syntax highlighting, and sitemap creation. Popular integrations mirror features available via plugins for Jekyll, Hugo, and Gatsby: image processing oriented like Sharp (image processing), syntax highlighting via Prism (syntax highlighter) or highlight.js, and feed output similar to tools from Feedburner-era workflows. The ecosystem includes official and third-party plugins maintained in public repositories and showcased in community resources alongside projects from Awesome lists and curated collections maintained by organizations such as OpenJS Foundation.

Use Cases and Adoption

Eleventy is used for personal blogs, technical documentation sites, design system documentation, marketing landing pages, and knowledge bases. Organizations and projects that prioritize performance and low runtime dependencies—similar to adopters of Hugo or Jekyll—choose Eleventy for its simplicity and extensibility. Educational resources, conference sites, and open source project pages frequently employ Eleventy where teams require easy integration with GitHub Pages or deployment platforms like Netlify. The tool’s flexibility has attracted contributors from communities around Accessibility (a11y) initiatives, Progressive Web App tooling, and static site advocacy groups.

Performance and Security Considerations

Performance with Eleventy benefits from static output, enabling content delivery via CDNs such as Cloudflare, Akamai, and Fastly and compatibility with modern build toolchains like Vite (software) and Rollup (software). Caching strategies, incremental builds, and image optimization can be implemented through plugins and CI/CD pipelines similar to patterns used by teams working with Next.js or Gatsby. Security concerns center on dependency management for npm packages, supply-chain risk similar to incidents affecting SolarWinds and Event-Stream (npm package), and careful handling of template code when evaluating untrusted data—paralleling mitigations advised for Handlebars and Nunjucks in multi-tenant environments.

Category:Static site generators