How to delete single and multiple documents in MongoDB using node.js ?

MongoDB, the most popular NoSQL database is an open-source document-oriented database. The term ‘NoSQL’ means ‘non-relational’. It means that MongoDB isn’t based on the table-like relational database structure but provides an altogether different mechanism for storage and retrieval of data. This format of storage is called BSON (similar to JSON format). Refer this article.

mongodb module: This module of Node.js is used for connecting the MongoDB database as well as used for manipulating the collections and databases in MongoDB. mongodb.connect() method is used for connecting the MongoDb database which is running on a particular server on your machine. (Refer to this article). We can also use promises in this method in resolve the object contains all the methods and properties required for collection manipulation and in reject the error occurs during connection.

Installing module:

node install mongodb

Project structure:

Running the server on Local IP:

mongod --dbpath=data --bind_ip 127.0.0.1

MongoDB Database:

Database:GFG
Collection:GFGcollections

Structure of GFG database:

const MongoClient = require("mongodb");

// Server running 
const url = 'mongodb://localhost:27017/';

// Database name
const databasename = "GFG";

MongoClient.connect(url).then((client) => {

    // Connecting to the database
    const connect = client.db(databasename);

    // Database collection
    const collection = connect
        .collection("GFGcollections");

    // Delete single document 
    collection.deleteOne({ "name": "aayush" });

    // Delete multiple documents having name GFG
    collection.deleteMany({ "class": "GFG" });

    console.log("Deletion Successful");
}).catch((err) => {

    // If error occurred show the error message
    console.log(err.Message);
})

Output:

MongoDB database:

zack_aayush

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Article Tags :

• Technical Scripter
• Web Technologies
• Node.js
• MongoDB
• Technical Scripter 2020
• Node.js-Misc

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