Delete

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To delete a record, or document as it is called in MongoDB, we use the deleteOne() method.

The first parameter of the deleteOne() method is a query object defining which document to delete.

Example

Delete the document with the address "Mountain 21":

// Setup MongoDB connection
var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://localhost:27017/";

MongoClient.connect(url, function(err, db) {
  if (err) throw err;
  var dbo = db.db("mydb");
  var myquery = { address: 'Mountain 21' };
  dbo.collection("customers").deleteOne(myquery, function(err, obj) {
    if (err) throw err;
    console.log("1 document deleted");
    db.close();
  });
});

Output

1 document deleted

Delete Many

To delete more than one document, use the deleteMany() method.

The first parameter of the deleteMany() method is a query object defining which documents to delete.

Example

Delete all documents where the address starts with the letter "O":

// Same setup as previous example

var myquery = { address: /^O/ };
dbo.collection("customers").deleteMany(myquery, function(err, obj) {
  if (err) throw err;
  console.log(obj.result.n + " document(s) deleted");
  db.close();
});

Output

2 document(s) deleted

The Result Object

The deleteMany() method returns an object which contains information about how the execution affected the database.

The result object inside contains information about the execution, including the number of documents affected.

You can use this object to return the number of deleted documents:

Example

Return the number of deleted documents:

console.log(obj.result.n);