MongoDB query to convert from ObjectId to String

To convert from ObjectId to String, use toString() in MongoDB. Let us create a collection with documents −

> db.demo52.insertOne({"StudentName":"Chris"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e27129bcfb11e5c34d89910")
}

Display all documents from a collection with the help of find() method −

> db.demo52.find();

This will produce the following output −

{ "_id" : ObjectId("5e27129bcfb11e5c34d89910"), "StudentName" : "Chris" }

Following is the query to convert ObjectId to String −

> ObjectId("5e27129bcfb11e5c34d89910").toString();
ObjectId("5e27129bcfb11e5c34d89910")

Now you can check whether the ObjectId is in string or not −

> typeof ObjectId("5e27129bcfb11e5c34d89910").toString();

This will produce the following output −

String