How to connect mongodb Server with Node.js ?

mongodb.connect() method is the method of the MongoDB module of the Node.js which is used to connect the database with our Node.js Application. This is an asynchronous method of the MongoDB module.

Syntax:

mongodb.connect(path,callbackfunction)

Parameters: This method accept two parameters as mentioned above and described below:

1. Path/URL: The Path of the server of the MongoDB server which is running on a particular port number.
2. callbackfunction: It returns the err or the instance of the mongodb database for further operation if connection successful.

Connecting MongoDB to Node.js is essential for managing data in full-stack applications.

Installing module:

npm install mongodb --save

Project structure:

Command to run server on particular ip:

mongod --dbpath=data --bind_ip 127.0.0.1

FileName index.js

// Module calling
const MongoClient = require("mongodb");
// Server path
const url = 'mongodb://localhost:27017/';
// Name of the database
const dbname = "conFusion";
MongoClient.connect(url, (err,client)=>{
    if(!err) {
        console.log("successful connection with the server");  
    }
    else
        console.log("Error in the connectivity");
})

Running command:

node index.js

Output:

node index.js
(node:7016) DeprecationWarning: current Server Discovery and Monitoring engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor.
(Use `node --trace-deprecation ...` to show where the warning was created)
successful connection with the server