Introduction: 

In a Magento 2 e-commerce store, knowing the available salable quantity of a product is crucial for various reasons, including inventory management and displaying stock availability to customers. In this tutorial, we'll explore how to retrieve the product's salable quantity using Magento 2 code.

Example: 

To get the salable quantity of a product in Magento 2, you can use the StockStateProvider class. Here's an example of how to do it in a custom PHP script or within a Magento module:

<?php

use Magento\Framework\App\Bootstrap;
use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Store\Model\StoreManagerInterface;
use Magento\CatalogInventory\Api\StockStateProviderInterface;

require __DIR__ . '/app/bootstrap.php';

$bootstrap = Bootstrap::create(BP, $_SERVER);

/** @var StockStateProviderInterface $stockStateProvider */
$stockStateProvider = $bootstrap->getObjectManager()->get(StockStateProviderInterface::class);

/** @var StoreManagerInterface $storeManager */
$storeManager = $bootstrap->getObjectManager()->get(StoreManagerInterface::class);
$storeId = $storeManager->getStore()->getId();

$productId = 1; // Replace with the ID of the product you want to check.

try {
    $salableQty = $stockStateProvider->getStockQty($productId, $storeId);
    echo "Salable Quantity for Product #$productId: $salableQty";
} catch (\Exception $e) {
    echo "Error: " . $e->getMessage();
}

In this example, we first include the necessary Magento files and classes. Then, we get an instance of the StockStateProviderInterface and the store ID. Replace $productId with the ID of the product you want to check, and the script will output the salable quantity for that product.

Conclusion: 

Knowing how to get the salable quantity of a product in Magento 2 is essential for efficient inventory management and customer experience. The StockStateProvider class provides a straightforward way to retrieve this information programmatically.