Search by specific field in MongoDB

Let us first create a collection with documents −

> db.demo371.insertOne({"Name":"David","CountryName":"US"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e57f6982ae06a1609a00af2")
}
> db.demo371.insertOne({"Name":"John","CountryName":"UK"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e57f69e2ae06a1609a00af3")
}
> db.demo371.insertOne({"Name":"Bob","CountryName":"AUS"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e57f6a42ae06a1609a00af4")
}
> db.demo371.insertOne({"Name":"Mike","CountryName":"US"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e57f6ba2ae06a1609a00af5")
}

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

> db.demo371.find();

This will produce the following output −

{ "_id" : ObjectId("5e57f6982ae06a1609a00af2"), "Name" : "David", "CountryName" : "US" }
{ "_id" : ObjectId("5e57f69e2ae06a1609a00af3"), "Name" : "John", "CountryName" : "UK" }
{ "_id" : ObjectId("5e57f6a42ae06a1609a00af4"), "Name" : "Bob", "CountryName" : "AUS" }
{ "_id" : ObjectId("5e57f6ba2ae06a1609a00af5"), "Name" : "Mike", "CountryName" : "US" }

Following is the query to search by specific fields −

> db.demo371.find({ $or: [ { Name: "David" }, { CountryName: "UK"} ] } )

This will produce the following output −

{ "_id" : ObjectId("5e57f6982ae06a1609a00af2"), "Name" : "David", "CountryName" : "US" }
{ "_id" : ObjectId("5e57f69e2ae06a1609a00af3"), "Name" : "John", "CountryName" : "UK" }