In this Node.js tutorial, the author demonstrates how to create async functions that call the Couchbase SDK. The author starts by setting up a Node.js project with Couchbase and then connects to Couchbase using an async function. This connection includes server name/address, username/password, and bucket information. The author shows how to get a JSON document from Couchbase using an async function and handles any errors that may occur. Additionally, the author covers how to upsert a JSON document using an async function, demonstrating its ability to create new documents and retrieve existing ones. Finally, the author provides a full code sample for readers to try out these concepts. The tutorial concludes by congratulating readers on completing the upsert and get cycle in Node.js and invites them to explore further tutorials and resources.