Couchbase supports JSON documents, and importing them into Couchbase Server involves using the cbdocloader tool, which streamlines the process by first placing data into an in-memory cache before asynchronously writing it to disk. The tool requires specific command-line parameters, such as username, password, node IP address, and bucket name, with options for setting RAM quota and loading data from directories or zipped folders. An example given is the Vancouver Tree Dataset, which includes details about boulevard trees in Vancouver, and was split into individual JSON files for each tree using a Python script before being loaded into Couchbase using cbdocloader. The blog encourages users to explore the dataset further by creating views and offers insight into the application's real-world utility.