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NodeJS connections with MongoDB

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by Abdul Rawoof A R dot icon Updated: Jan 30, 2024

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Using MongoDB with Node.js is seamless. The driver links JavaScript objects to BSON documents. It means that developers can play with their data.   


We can connect to MongoDB with Nodejs using Mongoose.connect() method. The mongoose.connect to this port ('mongodb://127.0.0.1:27017/node'). We needed to connect the node database to the default port (27017). If the connection refuses in our machine, try using 127.0.0.1 instead of localhost. After starting your MongoDB server, put your connection string in your driver code. You can use the connection string "mongodb://localhost:". This is if your MongoDB Server is running. Where is the port number you configured your server to incoming connections? We can use the findOne() method to get data from a collection in MongoDB. The findOne() method displays the first occurrence in the selection. The query object is the first parameter of the findOne() method.  


Here is an example of how to connect Node.js with MongoDB:

Fig: Preview of the output that you will get on running this code from your IDE.

Code

Node.js connections with MongoDB

Lines of Code : 25dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
global.express = require('express');
global.app = express();
global.mongoose = require('mongoose');
var dbURI = "mongodb://localhost:27017/node";
mongoose.connect(dbURI);

// CONNECTION EVENTS
mongoose.connection.on('connected', function() {
    console.log('Mongoose connected to ' + dbURI);
});
mongoose.connection.on('error', function(err) {
    console.log('Mongoose connection error: ' + err);
});
mongoose.connection.on('disconnected', function() {
    console.log('Mongoose disconnected');
});

app.get('/',function(req,res){
  res.send('Hello World');
})

app.listen(3000,function(){
    console.log('server is running on port 3000')
});

Instructions

Follow the steps carefully to get the output easily.

  1. Install Visual Studio Code and MongoDB on your computer.
  2. Install - npm i express mongoos
  3. Create a new JS file.
  4. Copy the snippet using the 'Copy' button and paste it into that JS file.
  5. Save the file and open the terminal, using 'node filename(node.js) to get the output.


Note: If you are using node version above 17 or latest, replace 'localhost' by '127.0.0.1' in the dbURI.


I hope you found this helpful.


I found this code snippet by searching for 'nodejs connection with mongo' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created and tested in Visual Studio Code 1.74.1.
  2. Node version - 18.15.0.


Using this solution, we are able to connect node.js with mongodb with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to connect node.js with mongodb.

Dependent Library

node-express-mongooseby madhums

JavaScript doticonstar image 1340 doticonVersion:Currentdoticon
License: Permissive (MIT)

A boilerplate application for building web apps using node and mongodb

Support
    Quality
      Security
        License
          Reuse

            node-express-mongooseby madhums

            JavaScript doticon star image 1340 doticonVersion:Currentdoticon License: Permissive (MIT)

            A boilerplate application for building web apps using node and mongodb
            Support
              Quality
                Security
                  License
                    Reuse

                      You can also search for any dependent library on Kandi like 'express mongoose'.

                      FAQ

                      1. How do I establish a connection to MongoDB in a Node.js application? 

                      Use the official MongoDB Node.js driver and MongoDB module. Install it with npm install MongoDB. Then, create a connection using MongoClient.connect. 


                      2. What is Mongoose, and how does it differ from the MongoDB driver for Node.js? 

                      Mongoose is an ODM library for MongoDB and Node.js. It provides a higher-level abstraction for MongoDB interactions. It includes schema definition. It also has middleware support. This makes it better than the MongoDB driver. 


                      3. How can I handle errors during MongoDB operations in Node.js? 

                      Use try-catch blocks or handle errors in the callback functions. Also, the MongoDB driver often returns promises. This allows the use of catch for errors. 


                      4. What is the purpose of the ObjectId in MongoDB and how do I generate one in Node.js? 

                      ObjectId is a unique identifier for MongoDB documents. To generate one in Node.js, you can use ObjectId() from the MongoDB module. 


                      5. How can I perform CRUD (Create, Read, Update, Delete) operations with Node.js and MongoDB? 

                      Use methods provided by the MongoDB driver or Mongoose. For example, use insertOne or insertMany to create. Use finds to read. Use updateOne or updateMany to update. Use deleteOne or deleteMany to delete. 

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