Is it possible to return a list of specific values from a query in MongoDB?

To return a list of specific values, use map(). Let us create a collection with documents −

> db.demo195.insertOne({"Subject":"MySQL"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3af3f203d395bdc21346d4") } > db.demo195.insertOne({"Subject":"MongoDB"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3af3f703d395bdc21346d5") } > db.demo195.insertOne({"Subject":"Java"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3af3fa03d395bdc21346d6") }

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

> db.demo195.find();

This will produce the following output −

{ "_id" : ObjectId("5e3af3f203d395bdc21346d4"), "Subject" : "MySQL" } { "_id" : ObjectId("5e3af3f703d395bdc21346d5"), "Subject" : "MongoDB" } { "_id" : ObjectId("5e3af3fa03d395bdc21346d6"), "Subject" : "Java" }

Following is the query to return a list of specific values from a query −

> db.demo195.find().map(function(doc){ return doc.Subject });

This will produce the following output −

[ "MySQL", "MongoDB", "Java" ]