.liquid File — Liquid Template

Liquid is a template language created by Shopify for their e-commerce platform and later adopted by Jekyll, the static site generator that powers GitHub Pages. LIQUID files use a clean, readable syntax with double curly braces for output ({{ variable }}) and curly-brace-percent for logic ({% if condition %}). Liquid is intentionally limited — it's a "safe" template language that prevents template authors from executing arbitrary code, making it suitable for themes and templates created by third parties in multi-tenant environments. The language supports variables, filters (piped transformations like {{ title | upcase }}), tags for control flow (if, for, case, unless), objects representing platform data, and includes for template composition. Liquid is central to the Shopify theme development ecosystem, where thousands of stores use custom Liquid themes. Jekyll uses Liquid for its templating engine, enabling blogs and documentation sites hosted on GitHub Pages. The language has been ported to multiple programming languages including Ruby (original), Python, JavaScript, Go, C#, and PHP. Liquid's security-first design makes it ideal for any platform where users customize templates without risking server-side code execution.