> For the complete documentation index, see [llms.txt](https://support.functionjunctionapp.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.functionjunctionapp.com/additional-resources/shopify-functions.md). # Shopify Functions ## What is Shopify Functions? Shopify Functions allows developers to create custom backend logic for Shopify stores, enabling advanced customizations and integrations. This feature supports the use of JavaScript, Rust, and WebAssembly, and includes tools for input/output handling, network access, testing, debugging, logging, monitoring, and error handling. Additionally, it provides guidance on localization practices to ensure functions work globally. {% embed url="" %} To learn more about Shopify Functions, visit [About Shopify Functions](https://shopify.dev/docs/apps/build/functions)