# Hydrogen SDK API reference

Explore the API provided by the Shopify Hydrogen SDK.

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Use the summary below to quickly jump to a specific topic:

- [Components](/reference/sdk/hydrogen/api/components): Discover the React components available in the Shopify Hydrogen SDK.
- [Hooks](/reference/sdk/hydrogen/api/hooks): Discover the React hooks available in the Shopify Hydrogen SDK.
- [Functions](/reference/sdk/hydrogen/api/functions): Discover the server-side functions available in the Shopify Hydrogen SDK.
- [Setup](/reference/sdk/hydrogen/api/setup): Discover the functions that wire the SDK into your Hydrogen server.
- [Content](/reference/sdk/hydrogen/api/content): Discover how to access the default content downloaded by the CLI.
- [Types](/reference/sdk/hydrogen/api/types): Explore the TypeScript types provided by the Shopify Hydrogen SDK.
- [Environment variables](/reference/sdk/hydrogen/api/environment-variables): Learn how to configure the SDK using environment variables.