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Node.js MongoDB Remove


Delete Record

You can delete records, or documents as it is called in MongoDB, by using the remove() method.

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

Example

Delete any document with the address "Mountain 21":

var http = require('http');
var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://localhost:27017/mydb";

MongoClient.connect(url, function(err, db) {
  if (err) throw err;
  var myquery = { address: 'Mountain 21' };
  db.collection("customers").remove(myquery, function(err, obj) {
    if (err) throw err;
    console.log(obj.result.n + " document(s) deleted");
    db.close();
  });
});
Run example »

Save the code above in a file called "demo_remove.js" and run the file:

Run "demo_remove.js"

C:\Users\Your Name>node demo_remove.js

Which will give you this result:

1 record(s) deleted

The Result Object

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

Most of the information is not important to understand, but one object inside the object is called "result" which tells us if the execution went OK, and how many documents were affected.

The result object looks like this:

{ n: 1, ok: 1 }

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

Example

Return the number of deleted documents:

console.log(obj.result.n);

Which will produce this result:

1