# useStorage

Returns the key-value `Storage` interface for the extension point.

## 

### UseStorageGeneratedType

Returns the key-value `Storage` interface for the extension point.

#### Returns: Storage
export function useStorage<
  ID extends RenderExtensionPoint = RenderExtensionPoint,
>(): Storage {
  return useApi<ID>().storage;
}


### Storage

A key-value storage object for extension points.

Stored data is only available to this specific app
at this specific extension point.

The storage backend is implemented with `localStorage` and
should persist across the buyer's checkout session.
However, data persistence isn't guaranteed.

### read

value: `<T = unknown>(key: string) => Promise<T>`

Read and return a stored value by key.

The stored data is deserialized from JSON and returned as
its original primitive.

Returns `null` if no stored data exists.

### write

value: `(key: string, data: any) => Promise<void>`

Write stored data for this key.

The data must be serializable to JSON.

### delete

value: `(key: string) => Promise<void>`

Delete stored data by key.

## Related

- [StandardApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/standardapi)
- [CheckoutApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/checkoutapi)
- [OrderStatusApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/orderstatusapi)
- [CartLineDetailsApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/cartlinedetailsapi)
- [PickupPointsApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/pickuppointsapi)
- [PickupLocationsApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/pickuplocationsapi)
- [ShippingMethodDetailsApi](https://shopify.dev/docs/api/checkout-ui-extensions/apis/shippingmethoddetailsapi)
- [ExtensionPoints](https://shopify.dev/docs/api/checkout-ui-extensions/apis/extensionpoints)