magento2

How to check the product is exist in Magento 2 by SKU. For Simple product, Configurable product, Grouped product, Virtual product, Bundle product, Downloadable product, Gift card, and custom product type.

Magento 2 provided class Magento\Framework\Serialize\Serializer\Json for the JSON encode or decode.

Magento 2 provided easy way to call widget in to .phtml or Layout XML file.