What is return type of db.collection.find() in MongoDB?

The statement db.collection.find() returns the cursor of Result Set of a query by which you can iterate over the result set or print all documents.

Let us first create a collection with documents −

> db.findCursorDemo.insertOne({"ClientFirstName":"John","ClientLastName":"Smith"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd00a1c588d4a6447b2e05c")
}
> db.findCursorDemo.insertOne({"ClientFirstName":"Carol","ClientLastName":"Taylor"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd00a26588d4a6447b2e05d")
}
> db.findCursorDemo.insertOne({"ClientFirstName":"David","ClientLastName":"Miller"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd00a33588d4a6447b2e05e")
}

Following is the query to display all documents from a collection with the help of find() method −

> db.findCursorDemo.find();

This will produce the following output −

{ "_id" : ObjectId("5cd00a1c588d4a6447b2e05c"), "ClientFirstName" : "John", "ClientLastName" : "Smith" }
{ "_id" : ObjectId("5cd00a26588d4a6447b2e05d"), "ClientFirstName" : "Carol", "ClientLastName" : "Taylor" }
{ "_id" : ObjectId("5cd00a33588d4a6447b2e05e"), "ClientFirstName" : "David", "ClientLastName" : "Miller" }