^Features Site globals

siteData feature adds global site data to your Eleventy project, providing commonly needed values that can be accessed in all templates:

Variable	Value
`{{ site.year }}`	The current year as a number (e.g., `2026`)
`{{ site.prod }}`	Boolean indicating if running in production mode (`true` for `eleventy build`, `false` for `eleventy serve`)

How it works

export default function (eleventyConfig) {
  eleventyConfig.addGlobalData("site.prod", () => process.env.ELEVENTY_RUN_MODE === "build");
  eleventyConfig.addGlobalData("site.year", () => new Date().getFullYear());
}