Drop mongodb collection using node.js

In this part of the mongodb operations using node.js tutorial series , we will learn about how we can drop a mongodb collection using node.js.

We will start by including mongodb npm package as shown below :

												
var mongo = require('mongodb');
												
											

Establish a connection between the mongoDb database and our node.js app using the following :

												
var new_db = "mongodb://localhost:27017/demo_db"
												
											

• demo_db is the name of the database. You can change it in accordance with your database name.
• 27017 is the port where mongoDb is running.
• Localhost i.e. 127.0.0.1 is the local IP.

There are 2 methods with which we can drop a collection in mongodb which are expained with example below.

1. drop : This is the first method which we are going to discuss. It's syntax is :
   

   													
   db.collection("NAME_OF_THE_COLLECTION").drop( (CALLBACK_FUNCTION) => {});
   													
   												

   
   An example is given below :
   
   

   													
   //drop.js
   var mongo = require('mongodb');
   var new_db = "mongodb://localhost:27017/demo_db"
   
   //Connecting to the database
   mongo.connect(new_db ,(error , db) => {
   	if (error){
   		throw error;
   	}
   	//ACCESSING A COLLECTION IN MONGODB USING NODE.JS
   	db.collection("new").drop( (err , collection) => {
   		if(err) throw err;
   		if(collection) console.log("Dropped successfully");
   		db.close();
   	});
   });
   													
   												

   
   You can run the above code using the following command :
   

   													
   >node drop.js
   Dropped successfully
   
   													
   												

   
   
2. dropCollection() : This is another way of deleting a mongodb collection. It's syntax is :
   

   													
   db.dropCollection("NAME OF THE COLLECTION" , (CALLBACK FUNCTION) => {});
   													
   												

   
   An example is given below :
   
   

   													
   //dropcollection.js
   var mongo = require('mongodb');
   var new_db = "mongodb://localhost:27017/demo_db"
   
   mongo.connect(new_db ,(error , db) => {
   	if (error){
   		throw error;
   	}
   	
   	//Accessing the collection
   	db.dropCollection("details" , (err , collection) => {
   		if(err) throw err;
   		
   		if(collection) console.log("Dropped successfully");
   		
   		db.close();
   	});
   });
   													
   												

   
   You can run the above code using the following command :
   

   													
   >node dropcollection.js
   Dropped successfully
   
   													
   												

   
   

In this article we learned about

1. Including monogdb npm package in your app.
2. Establishing a connection between mongodb database and node.js application.
3. drop() method in mongodb to delete a collection using node.js
4. dropCollection() in mongodb to delete a collection using node.js