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  • Compatibility

New in version 5.0.

Returns a document that describes the role of the mongod instance.

If the mongod is a member of a replica set, then the isWritablePrimary and secondary fields report if the instance is the primary or if it is a secondary member of the replica set.



hello for the complete documentation of the output of db.hello().

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

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


This command is supported in all MongoDB Atlas clusters. For information on all commands, see Unsupported Commands.

← db.getSiblingDB()

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