If you're working with APIs to create objects, you might wonder how to retrieve the ID of the created object. This can be useful for further operations or for tracking purposes. Here's a simple approach to return the ID of an object created in an API.

1. Understand the API response format: When you create an object through an API, the API should respond with a JSON object containing information about the created object, including its ID.

2. Parse the API response: Once you receive the API response, parse the JSON data to extract the ID of the created object. This can usually be found in a specific field within the JSON response, such as 'id' or 'object_id'.

3. Return the ID: After extracting the ID from the JSON response, you can include it in the response that your API returns to the client. This can be done by formatting a new JSON object with the ID as one of its fields and returning it as part of the API response.

4. Example code snippet:

```javascript

// Assuming 'apiResponse' contains the JSON response from the API

const createdObjectId = apiResponse.id;

const responseObject = { id: createdObjectId };

res.json(responseObject);

```

In this example, 'apiResponse' is the JSON response from the API, and the 'id' field is extracted and included in a new JSON object 'responseObject'. This new object is then returned as the API response, allowing the client to retrieve the ID of the created object.

By following these steps and including the ID in the API response, you can make it easier for clients to work with the objects they create through your API. This can streamline their workflow and improve the usability of your API. Remember to always handle errors and edge cases when working with API responses to ensure a smooth experience for your users.