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# Method name: decrementInventory(items: Array<DecrementInfo>)

# Method package: wixStoresBackend

# Method menu location: wixStoresBackend --> decrementInventory

# Method Link: https://dev.wix.com/docs/velo/apis/wix-stores-backend/decrement-inventory.md

# Method Description:

Subtracts a set number of items from inventory.

The `decrementInventory()` function returns a Promise that is resolved
 when the specified item's quantity has been updated in the inventory.



# Method Code Examples:

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

## Decrement the inventory of a product's first variant

```javascript
/*******************************
 * Backend code - inventory.jsw *
 *******************************/

import wixStoresBackend from 'wix-stores-backend';

export function decrementInventory(decrementInfo) {
  return wixStoresBackend.decrementInventory(decrementInfo);
}

/**************
 * Page code *
 **************/

import { decrementInventory } from 'backend/inventory';


async function decrementHandler() {

  const productId = "3fb6a3c8-988b-8755-04bd-ks75ae0b18ea"
  let variants = await getProductVariants(productId);

  decrementInventory(
    [{
      variantId: variants[0]._id,
      productId: productId,
      decrementBy: 1
    }])
    .then(() => {
      console.log("Inventory decremented successfully")
    })
    .catch(error => {
      // Inventory decrement failed
      console.error(error);
    })
}
```

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