How to delete multiple documents in MongoDB using deleteMany()?

Let us first create a collection with documents −

> db.deleteMultipleDocumentsDemo.insertOne({"StudentFirstName":"Larry"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5ce00b07bf3115999ed51214")
}
> db.deleteMultipleDocumentsDemo.insertOne({"StudentFirstName":"Chris"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5ce00b0bbf3115999ed51215")
}
> db.deleteMultipleDocumentsDemo.insertOne({"StudentFirstName":"David"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5ce00b0fbf3115999ed51216")
}
> db.deleteMultipleDocumentsDemo.insertOne({"StudentFirstName":"Bob"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5ce00b12bf3115999ed51217")
}
> db.deleteMultipleDocumentsDemo.insertOne({"StudentFirstName":"Carol"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5ce00b18bf3115999ed51218")
}

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

> db.deleteMultipleDocumentsDemo.find();

This will produce the following output −

{ "_id" : ObjectId("5ce00b07bf3115999ed51214"), "StudentFirstName" : "Larry" }
{ "_id" : ObjectId("5ce00b0bbf3115999ed51215"), "StudentFirstName" : "Chris" }
{ "_id" : ObjectId("5ce00b0fbf3115999ed51216"), "StudentFirstName" : "David" }
{ "_id" : ObjectId("5ce00b12bf3115999ed51217"), "StudentFirstName" : "Bob" }
{ "_id" : ObjectId("5ce00b18bf3115999ed51218"), "StudentFirstName" : "Carol" }

Following is the query to delete multiple documents in MongoDB −

> db.deleteMultipleDocumentsDemo.deleteMany({StudentFirstName: {$in: ["Larry", "David", "Carol"]}});
{ "acknowledged" : true, "deletedCount" : 3 }

Let us display the document once again −

> db.deleteMultipleDocumentsDemo.find();

This will produce the following output −

{ "_id" : ObjectId("5ce00b0bbf3115999ed51215"), "StudentFirstName" : "Chris" }
{ "_id" : ObjectId("5ce00b12bf3115999ed51217"), "StudentFirstName" : "Bob" }