To return documents of a collection without objectId, set _id:0. Let us first create a collection with documents −
> db.returnDocumentWithoutObjectId.insertOne({"Name":"Carol","Age":25}); { "acknowledged" : true, "insertedId" : ObjectId("5ce8ba6c78f00858fb12e8fa") } > db.returnDocumentWithoutObjectId.insertOne({"Name":"Sam","Age":21}); { "acknowledged" : true, "insertedId" : ObjectId("5ce8ba6d78f00858fb12e8fb") } > db.returnDocumentWithoutObjectId.insertOne({"Name":"John","Age":23}); { "acknowledged" : true, "insertedId" : ObjectId("5ce8ba6f78f00858fb12e8fc") }
Following is the query to display all documents from a collection with the help of find() method −
> db.returnDocumentWithoutObjectId.find();
This will produce the following output −
{ "_id" : ObjectId("5ce8ba6c78f00858fb12e8fa"), "Name" : "Carol", "Age" : 25 } { "_id" : ObjectId("5ce8ba6d78f00858fb12e8fb"), "Name" : "Sam", "Age" : 21 } { "_id" : ObjectId("5ce8ba6f78f00858fb12e8fc"), "Name" : "John", "Age" : 23 }
Following is the query to return documents of a collection without objectId in MongoDB −
> db.returnDocumentWithoutObjectId.find({},{_id:0});
This will produce the following output −
{ "Name" : "Carol", "Age" : 25 } { "Name" : "Sam", "Age" : 21 } { "Name" : "John", "Age" : 23 }