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# Method name: addProductsToCollection(collectionId: string, productIds: Array<string>)

# Method package: wixStoresBackend

# Method menu location: wixStoresBackend --> addProductsToCollection

# Method Link: https://dev.wix.com/docs/velo/apis/wix-stores-backend/add-products-to-collection.md

# Method Description:

Adds products by ID to a product collection.

The `addProductsToCollection()` function returns a Promise that resolves when the
 products with the given IDs are added to a product collection with a given ID.

 You can add multiple products to a collection at one time by delimiting the list of products
 with commas.

 With this function, you can only add existing products to a collection. You cannot use the `addProductsToCollection()` function to create a product. See [`createProduct()`](#createProduct) to add a product to the store.



# Method Code Examples:

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

## Add products to a product collection

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

import wixStoresBackend from 'wix-stores-backend';

export function addProductsToCollection(collectionId, productIds) {
  return wixStoresBackend.addProductsToCollection(collectionId, productIds);
}

/*************
 * Page code *
 *************/
import { addProductsToCollection } from 'backend/products';

// ...


const collectionId =  ... // get collection ID
const productIds = ["id1", "id2", "id3"];

addProductsToCollection(collectionId, productIds)
  .then(() => {
    // products added to the collection 
  })
  .catch((error) => {
    // products not added to the collection 
  });
```

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