This version of the documentation is archived and no longer
supported. View the current documentation to learn how to
upgrade your version of MongoDB.
db.isMaster()Deprecated since version 4.4.2: Use
db.hello()instead.Returns a document that describes the role of the
mongodinstance.If the
mongodis a member of a replica set, then theismasterandsecondaryfields report if the instance is the primary or if it is a secondary member of the replica set.