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YouCan Developer Docs

Build apps, themes and integrations for YouCan stores. Guides, API references and UI libraries, all in one place.

Get startedBrowse the API

Extend YouCan stores

Add features to sellers' stores, build their storefronts, and connect AI assistants.

Build

AppsBuild an appEmbedded, external and extension-only apps that add features, surface data and give sellers new tools.Get started with apps →ThemesBuild a themeStorefronts built with Liquid, HTML, CSS, JavaScript and JSON, from the starter theme or your own.Create a theme →MCPConnect an AI assistantThe YouCan MCP server lets Claude, ChatGPT, Cursor and others read and change a store.Set up the MCP server →

APIs and references

Everything a store exposes, from REST endpoints to the Liquid objects themes render.

Reference

RESTAdmin APIManage products, orders, customers and the rest of a store over REST.Read the getting started guide →RESTStorefront APISearch, paginate, sort and filter the resources a storefront shows.Browse query filters →LiquidLiquid referenceThe tags, filters and objects that render store data in a theme.Explore Liquid →PaymentsYouCan PayIntegrate your application with YouCan Pay through its REST API.Start with YouCan Pay →

Design systems

Tokens, icons and Vue 3 components that look at home in the YouCan ecosystem.

Design

Vue 3Celeste UIYouCan's design system: design tokens, icons and Vue 3 components.Explore Celeste →

What's new

The latest additions and improvements across the YouCan platform.

View changelog →
6 October 2026ThemesRender, include and paginate fixes

with, for and as now work on render, include renders snippets, and the older paginate form now sets the paginate object.

Read more →6 October 2026ThemesTheme file checks and required files

Every theme file is checked when it is saved. If a save is rejected, you get the list of errors with their file and line. Themes must contain a layout and nine templates. The doc tag is supported.

Read more →5 October 2026ThemesCustomer accounts

Themes can render the customer account pages: login, register, password reset, account, orders and addresses. A customer object describes the logged in customer, and the storefront API has customer endpoints for login, logout and password recovery.

Read more →