Magento 2 is a powerful e-commerce platform with comprehensive API support. While it provides default REST APIs, there are cases where you may need to create a custom REST API. This article guides you through the process of creating a custom REST API in Magento 2. ## What is a Magento 2 Custom REST API? A Custom REST API in Magento 2 is a web service endpoint that you develop to perform specific actions or retrieve particular data from your Magento store. These custom APIs are designed to meet your unique business requirements. They facilitate integration between Magento and external systems, mobile applications, or other software solutions. Custom APIs become essential when the default Magento APIs do not cover certain functionalities or data access needs. **Common Scenarios for Creating a Custom REST API in Magento 2:** - **Integrating with Third-party Systems:** Custom APIs enable seamless data exchange with external platforms such as ERP systems, CRM software, or payment gateways. - **Building Mobile Applications:** These APIs provide the necessary endpoints for mobile apps to interact with your Magento store. - **Implementing Unique Features:** Custom APIs support specialized functionalities like custom loyalty programs or personalized product recommendation engines. ## Steps to Create a Custom Magento 2 REST API ### Step 1: Set Up Your Development Environment Ensure you have a Magento 2 development environment ready. You will also need a code editor and a REST client (such as Postman) to test your API. ### Step 2: Define Your API Endpoints Identify the functionality you want to expose via the API. For this example, we will create an API endpoint to retrieve product details by SKU. ### Step 3: Create a Module Create a custom module to house your API. Replace `Vendor` and `Module` with your own namespace and module names. Create **_app/code/Vendor/Module/etc/module.xml_** with the following content: ```xml ``` Create **_app/code/Vendor/Module/registration.php_** with the following content: ```php ``` ### Step 5: Create a Dependency Injection Configuration Specify the implementation class for your API interface in a `di.xml` file. Create **_app/code/Vendor/Module/etc/di.xml_** with the following content: ```xml ``` ### Step 6: Create the API Interface Define the interface that declares the methods your API will expose. Create **_app/code/Vendor/Module/Api/ProductInterface.php_** with the following content: ```php productRepository = $productRepository; } /** * {@inheritdoc} */ public function getProductBySku($sku) { try { $product = $this->productRepository->get($sku); return $product; } catch (NoSuchEntityException $e) { throw new NoSuchEntityException(__('Product with SKU %1 not found.', $sku)); } } } ``` ### Step 8: Test Your Custom API You can now test your custom API using a REST client like Postman. Make a GET request to the following endpoint: ``` [YourMagentoURL]/rest/V1/custom/product/{SKU} ``` Replace `{SKU}` with the SKU of the product you want to retrieve. You should receive a JSON response containing the product details. --- _**Note:** This article references content from https://meetanshi.com/blog/create-custom-rest-api-in-magento-2/. It may include excerpts from the original author._ If you have any questions or need further clarification, please feel free to leave a comment.