Couchbase 6.6 introduces a feature that allows users to import documents via the Couchbase Admin Web Console, offering a simpler alternative for small datasets compared to the more robust cbimport command-line tool. This web-based feature enables users to upload data in various formats, such as JSON List, JSON Lines, CSV, and TSV, directly into Couchbase buckets, with options to set document keys using UUIDs or field values. The blog post provides a practical demonstration of importing a small JSON dataset, highlighting the ease of use and potential issues like duplicate IDs when using the Value of Field option. It underscores the distinctions between different file formats, particularly in handling JSON data structure and null values, which can affect the integrity of imported data.