Swagger is an ecosystem of tools and resources for managing REST APIs, which has been incorporated into Couchbase's documentation a few months ago. The Swagger specification is the core component, and once the API spec is defined for endpoints, it provides valuable capabilities such as live embeddable documentation and client libraries. These features can be demonstrated through various videos and blog posts, including an example of using a Swagger JavaScript client with Couchbase Mobile. The public and admin APIs for Sync Gateway have also been made available, along with configuration files that can be used to test the API endpoints, although there is currently a known issue with making calls from the Couchbase documentation due to security requirements.