Display MongoDB records by ObjectId?

Let us first create a collection with documents −

> db.findByObjectIdDemo.insertOne({"ClientName":"Larry","ClientAge":23});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd68cd657806ebf1256f11a")
}
> db.findByObjectIdDemo.insertOne({"ClientName":"Chris","ClientAge":26});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd68cdc57806ebf1256f11b")
}
> db.findByObjectIdDemo.insertOne({"ClientName":"David","ClientAge":38,"isMarried":true});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd68cf657806ebf1256f11c")
}

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

> db.findByObjectIdDemo.find().pretty();

This will produce the following output −

{
   "_id" : ObjectId("5cd68cd657806ebf1256f11a"),
   "ClientName" : "Larry",
   "ClientAge" : 23
}
{
   "_id" : ObjectId("5cd68cdc57806ebf1256f11b"),
   "ClientName" : "Chris",
   "ClientAge" : 26
}
{
   "_id" : ObjectId("5cd68cf657806ebf1256f11c"),
   "ClientName" : "David",
   "ClientAge" : 38,
   "isMarried" : true
}

Following is the query to find by ObjectId −

> db.findByObjectIdDemo.find({_id: new ObjectId("5cd68cf657806ebf1256f11c")}).toArray(function(err, myDocument) { console.log(myDocument); });

This will produce the following output −

[
   {
      "_id" : ObjectId("5cd68cf657806ebf1256f11c"),
      "ClientName" : "David",
      "ClientAge" : 38,
      "isMarried" : true
   }
]