Migrate to Polaris

Version 2025-07 is the last API version to support React-based UI components. Later versions use web components, native UI elements with built-in accessibility, better performance, and consistent styling with Shopify's design system. Check out the migration guide to upgrade your extension.

Choose a version:

Storefront API

Querying the Storefront API.

Anchor to StandardApiStandardApi

The base API object provided to purchase extension targets.

Anchor to query query <Data = unknown, Variables = Record<string, unknown>>(query: string, options?: { variables?: Variables; version?: ; }) => Promise<{ data?: Data; errors?: []; }> required: The method used to query the Storefront GraphQL API with a prefetched token.

StorefrontApiVersion

The supported Storefront API versions. Pass one of these values to `query()` to target a specific API version when querying the Storefront GraphQL API.

'2022-04' | '2022-07' | '2022-10' | '2023-01' | '2023-04' | '2023-07' | '2024-01' | '2024-04' | '2024-07' | '2024-10' | '2025-01' | '2025-04' | 'unstable'

GraphQLError

An error returned by the Storefront GraphQL API. Contains a human-readable `message` and an `extensions` object with the request ID and error code for debugging.

extensions
Additional error metadata including the request ID and error code.
```
{ requestId: string; code: string; }
```
message
A human-readable description of the error.
```
string
```

Examples

import {useEffect, useState} from 'react';

import {

useApi,

reactExtension,

List,

ListItem,

} from '@shopify/ui-extensions-react/checkout';

export default reactExtension(

'purchase.checkout.block.render',

() => <Extension />,

);

function Extension() {

const [data, setData] = useState();

const {query} = useApi();

useEffect(() => {

query(

`query ($first: Int!) {

products(first: $first) {

nodes {

title

}

}`,

{

variables: {first: 5},

)

.then(({data, errors}) => setData(data))

.catch(console.error);

}, [query]);

return (

<List>

{data?.products?.nodes.map((node) => (

{node.title}

</ListItem>

))}

</List>

);

}

Examples

Access the Storefront API with query

Description

You can access the [Storefront GraphQL API](/docs/api/storefront) via the `query()` helper function. Ensure your extension can use this API by [enabling the `api_access` capability](/docs/api/checkout-ui-extensions/configuration#api-access).

React

import {useEffect, useState} from 'react';
import {
  useApi,
  reactExtension,
  List,
  ListItem,
} from '@shopify/ui-extensions-react/checkout';

export default reactExtension(
  'purchase.checkout.block.render',
  () => <Extension />,
);

function Extension() {
  const [data, setData] = useState();
  const {query} = useApi();

  useEffect(() => {
    query(
      `query ($first: Int!) {
        products(first: $first) {
          nodes {
            id
            title
          }
        }
      }`,
      {
        variables: {first: 5},
      },
    )
      .then(({data, errors}) => setData(data))
      .catch(console.error);
  }, [query]);

  return (
    <List>
      {data?.products?.nodes.map((node) => (
        <ListItem key={node.id}>
          {node.title}
        </ListItem>
      ))}
    </List>
  );
}

JavaScript

import {
  extension,
  List,
  ListItem,
} from '@shopify/ui-extensions/checkout';

export default extension(
  'purchase.checkout.block.render',
  (root, {query}) => {
    query<any>(
      `query ($first: Int!) {
      products(first: $first) {
        nodes {
          id
          title
        }
      }
    }`,
      {
        variables: {first: 5},
      },
    )
      .then(({data}) => {
        const listItems =
          data?.products?.nodes.map((node) =>
            root.createComponent(
              ListItem,
              undefined,
              node.title,
            ),
          );

        root.appendChild(
          root.createComponent(
            List,
            undefined,
            listItems,
          ),
        );
      })
      .catch(console.error);
  },
);

Accessing the Storefront API with fetch()

Description

You can access the [Storefront GraphQL API](/docs/api/storefront) using global `fetch()`. Ensure your extension can access the Storefront API via the [`api_access` capability](/docs/api/checkout-ui-extensions/configuration#api-access). The `shopify:storefront` protocol will automatically infer your Storefront URL and API version declared in your extension config. By omitting the API version (recommended), Shopify will use your API version configured in `shopify.extension.toml`. To change the API version, simply add it to the URL like `shopify:storefront/api/2024-04/graphql.json`. See [Storefront GraphQL API endpoints](/docs/api/storefront#endpoints) for more information.

React

import {useEffect, useState} from 'react';
import {
  useApi,
  reactExtension,
  List,
  ListItem,
} from '@shopify/ui-extensions-react/checkout';

export default reactExtension(
  'purchase.checkout.block.render',
  () => <Extension />,
);

function Extension() {
  const {shop} = useApi();
  const [data, setData] = useState();

  useEffect(() => {
    const getProductsQuery = {
      query: `query ($first: Int!) {
        products(first: $first) {
          nodes {
            id
            title
          }
        }
      }`,
      variables: {first: 5},
    };

    fetch('shopify:storefront/api/graphql.json', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify(getProductsQuery),
    })
      .then((response) => response.json())
      .then(({data, errors}) => setData(data))
      .catch(console.error);
  });

  return (
    <List>
      {data?.products?.nodes.map((node) => (
        <ListItem key={node.id}>
          {node.title}
        </ListItem>
      ))}
    </List>
  );
}

JavaScript

import {
  extension,
  List,
  ListItem,
} from '@shopify/ui-extensions/checkout';

export default extension(
  'purchase.checkout.block.render',
  (root) => {
    const getProductsQuery = {
      query: `query ($first: Int!) {
      products(first: $first) {
        nodes {
          id
          title
        }
      }
    }`,
      variables: {first: 5},
    };

    fetch('shopify:storefront/api/graphql.json', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify(getProductsQuery),
    })
      .then((response) => response.json())
      .then(({data}) => {
        const listItems =
          data?.products?.nodes.map((node) =>
            root.createComponent(
              ListItem,
              undefined,
              node.title,
            ),
          );

        root.appendChild(
          root.createComponent(
            List,
            undefined,
            listItems,
          ),
        );
      })
      .catch(console.error);
  },
);

Anchor to RelatedRelated

ReferenceTargets

ReferenceComponents

ReferenceConfiguration

LearnTutorials

Was this page helpful?