An ASP.NET CRUD application involves creating, reading, updating, and deleting data, with this post focusing on utilizing Couchbase's key-value API for efficient data access. While Couchbase supports SQL++ for querying JSON data, the key-value API is highlighted as the most efficient method, especially for direct lookups using known keys. Examples include retrieving user data and handling sub-documents for large entries. The text demonstrates implementing a Get CRUD endpoint in ASP.NET Core, which requires a wishlist item ID as a parameter and leverages Couchbase's JSON storage system for serialization. The discussion also touches on potential improvements needed for production readiness, such as error handling, validation, authentication, and logging, emphasizing the availability of ASP.NET Core's built-in tools and third-party libraries to address these concerns. The article concludes with a look ahead to future posts on creating and updating data, encouraging readers to explore Couchbase Capella and the Couchbase Playground for practical examples.