Run a playground section in the VSCode docs should also mention explicitly the following: If the connection string has specified a database to be connected to by default then the playgrounds will run against the default connected database unless there is an explicit call to use another database (use("another-db")). The autocomplete will also try to autocomplete the collection names available on the default connected database. The message that appears after the connection will also notify the users of the default connected database (screenshot provided).