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Mongo.getDBNames() (mongosh method)

Description

Mongo.getDBNames()

Returns a list of available databases. Mongo.getDBNames() calls the listDatabases command.

The Mongo.getDBNames() method doesn't take any parameters.

Compatibility

This method is available in deployments hosted in the following environments:

MongoDB Atlas: The fully managed service for MongoDB deployments in the cloud

MongoDB Enterprise: The subscription-based, self-managed version of MongoDB
MongoDB Community: The source-available, free-to-use, and self-managed version of MongoDB

Examples

List Databases

List the available databases for the current MongoDB instance:

db.getMongo().getDBNames()

The db.getMongo() method creates a connection to the instance. Mongo.getDBNames() returns:

[ 'admin', 'config', 'local', 'test' ]

Map Database List to Another Method

Use Mongo.getDBNames() to get a list of collections:

db.getMongo().getDBNames().map(
   name => db.getSiblingDB( name ).getCollectionNames()
)

Example output:

[
   [ 'system.users', 'system.keys', 'system.version' ],
   [
     'settings',
     'tenantMigrationRecipients',
     'system.sessions',
     'transactions',
     'external_validation_keys',
     'image_collection',
     'tenantMigrationDonors',
     'system.indexBuilds'
   ],
   [
     'replset.minvalid',
     'system.views',
     'oplog.rs',
     'replset.initialSyncId',
     'startup_log',
     'system.replset',
     'system.rollback.id',
     'replset.oplogTruncateAfterPoint',
     'replset.election',
     'system.tenantMigration.oplogView'
   ],
   [
     'feedback',
     'inventory',
     'engineers',
     'clothes'
   ]
]

Mongo.getDBNames() returns a list of databases.
map defines a function that iterates over the list of databases. Each iteration of map:
- assigns a database to the name variable,
- connects to the database currently stored in name using db.getSiblingDB(),
- returns the collections in the current database using db.getCollectionNames().

Back

Mongo.getDB

Mongo.getDBs