Which three operations are suitable to be performed in a controller?

Generating the response as JSON or HTML is a fundamental operation performed within a controller in the Salesforce B2C Commerce architecture. Controllers are responsible for managing the flow of data between the model and the view. When a request is made, the controller processes that request, interacts with necessary models, and then generates a response to be sent back to the client. This response can be formatted in different ways, such as JSON for API responses or HTML for web pages, depending on the type of application and the needs of the frontend.

A well-structured controller handles the logic needed to provide the correct output format, ensuring that the client receives the data as intended. This operation is vital for maintaining a seamless interaction layer in the application, enabling clients to receive and display data in the appropriate format.

It's important to note that while creating plain JavaScript objects or utilizing middleware functions may be relevant in other contexts, they don't encapsulate the primary responsibility of a controller. Furthermore, using the model for the view is part of the MVC (Model-View-Controller) pattern, which is essential, but the operation of generating responses directly aligns more with the core controller functions, emphasizing the controller's role in formatting and sending output to the client.