How to print document value in MongoDB shell?

For this, work with the concept of forEach(). Let us first create a collection with documents −

> db.printDocuementValueDemo.insertOne({"InstructorName":"John Smith"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd6804f7924bb85b3f48950")
}
> db.printDocuementValueDemo.insertOne({"InstructorName":"Sam Williams"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd680577924bb85b3f48951")
}
> db.printDocuementValueDemo.insertOne({"InstructorName":"David Miller"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd680637924bb85b3f48952")
}

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

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

This will produce the following output −

{
   "_id" : ObjectId("5cd6804f7924bb85b3f48950"),
   "InstructorName" : "John Smith"
}
{
   "_id" : ObjectId("5cd680577924bb85b3f48951"),
   "InstructorName" : "Sam Williams"
}
{
   "_id" : ObjectId("5cd680637924bb85b3f48952"),
   "InstructorName" : "David Miller"
}

Following is the query to print document value in MongoDB shell −

> db.printDocuementValueDemo.find(
   { _id : ObjectId("5cd680577924bb85b3f48951") },
   {InstructorName: 1, _id:0}
).forEach(function(myDocument) {
   print(myDocument.InstructorName);
});

This will produce the following output −

Sam Williams