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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 system

Celeste is YouCan's design system: tokens, icons and Vue 3 components.

Vue 3Celeste UIThe colors, type, spacing and components of the YouCan seller area, for apps and admin pages.
FoundationsIconsComponents
Explore Celeste →

What's new

The latest additions and improvements across the YouCan platform.

View changelog →
11 October 2026AppsPlan change timing

A change from a monthly plan to a yearly plan is now applied at once.

Read more →11 October 2026AppsStore state errors

You get a code for the store state in API errors for a closed, on hold or deleted store.

Read more →11 October 2026ThemesArray and preload filters

You can preload fonts with preload_tag, and you can pass nil or a property to compact and uniq.

Read more →