MongoDB Tutorial

MongoDB: db.auth() method


The db.auth() method is used to authenticates a user to a database.



Allows a user to authenticate to the database from within the shell.

The db.auth() method can accept either:

  • the username and password.
  • db.auth( <username>, <password> )
  • a user document that contains the username and password, and optionally, the authentication mechanism and a digest password flag.
  • db.auth( {
       user: <username>,
       pwd: <password>,
       mechanism: <authentication mechanism>,
       digestPassword: <boolean>
    } )


Name Description Required /
username Specifies an existing username with access privileges for this database. Required string
password Specifies the corresponding password. Required string
mechanism Specifies the authentication mechanism used. Defaults to either:
  • SCRAM-SHA-1 on new 3.0 installations and on 3.0 databases that have been upgraded from 2.6 with authSchemaUpgrade; or
  • MONGODB-CR otherwise.
Optional string
digestPassword Determines whether the server receives digested or undigested password. Set to false to specify undigested password. For use with SASL/LDAP authentication since the server must forward an undigested password to saslauthd. Optional boolean

Alternatively, you can use mongo --username, --password, and --authenticationMechanism to specify authentication credentials.

NOTE: The mongo shell excludes all db.auth() operations from the saved history.

Returns: db.auth() returns 0 when authentication is not successful, and 1 when the operation is successful.

Example: MongoDB: db.auth() method

Assume that A user document for a database that contains the username "mynewuser" and password "myuser123". The following example will authenticate the user for the database.

db.auth( "mynewuser", "myuser123" );


> db.auth( "mynewuser", "myuser123" );

Retrieve the restaurants data from here

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