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# Method name: onInventoryVariantUpdated(event: InventoryVariantUpdatedEvent)

# Method package: wixStoresBackend

# Method menu location: wixStoresBackend --> Events --> onInventoryVariantUpdated

# Method Link: https://dev.wix.com/docs/velo/apis/wix-stores-backend/events/on-inventory-variant-updated.md

# Method Description:

An event that fires when the inventory information of a product variant is updated.

The `onInventoryVariantUpdated()` event handler runs when inventory information for a product
 variant is updated in a store.

> **Note:** Backend events don't work when previewing your site.



# Method Code Examples:

*** Note: do not assume any prop names or enum values other than the ones in the example.

## An event when product variant inventory information is updated

```javascript
// Place this code in the events.js file
// of your site's Backend section.

export function wixStores_onInventoryVariantUpdated(event) {
  let inventoryItemId = event.inventoryItemId;
  let firstVariant = event.variants[0];
  let firstNewQuantity = firstVariant.newValue.quantity;
}

/*  Full event object:
 *
 *  {
 *    "variants": [
 *      {
 *        "oldValue": {
 *          "inStock": true,
 *          "quantity": 10
 *        },
 *        "newValue": {
 *          "inStock": true,
 *          "quantity": 50
 *        },
 *        "id": "00000000-0000-0000-0000-000000000000"
 *      }
 *    ],
 *    "externalId": "8fe8f05f-951e-1563-b917-88adf8284543",
 *    "inventoryItemId": "70170fa0-6ae1-ea9c-46e8-775207d7babc"
 *  }
 *
 */
```

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