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This blog will teach you how to connect your Node.js application to the MongoDB Atlas. Well there are a couple of ways you can use mongodb. You can either install mongodb into your local machine or you can use use the cloud database which is the MongoDB Atlas. 

Your computer must have enough RAM to support the application. I would suggest using Atlas for the beginners.So lets get started!

MongoDB is a document database with the scalability and flexibility.

MongoDB stores data in flexible, JSON-like documents.

Mongoose is an Object Data Modeling (ODM) library for MongoDB and Node.js

It manages relationship between data and provide schema validation.

Mongoose also provides connection between the database and the server.

Signing Up With Atlas & Creating a Cluster

Go to the link  https://www.mongodb.com/cloud/atlas  and click on start free.

After creating an account, you are provided with 512 MB of memory.

The Atlas will guide you through step by step process and eventually you can create clusters.

In the cluster creation process select the cloud provider and the region and fill in the cluster name.

Once the cluster is created you can see a connect button inside the sandbox.

Click on connect -> Connect your application

Add your connection string into your application code.

mongodb+srv://<username>:<password>@node-api-shop.5wrjk.mongodb.net/<dbname>?retryWrites=true&w=majority

Now you have to replace the username with your username and password with your password.

To be on safer side, always use the auto-generated password to prevent parsing errors.

And change the <dbname> in the url to test or any name of your choice.

The first step is to install the mongoose framework,

Import the mongoose package into your code,

const mongoose = require('mongoose'); //imports mongoose package

const url = 'mongodb+srv://JohnDoe:1234@node-api-shop.5wrjk.mongodb.net/<dbname>?retryWrites=true&w=majority'; 

mongoose.connect(uri, { useUnifiedTopology: true }, { useNewUrlParser: true });

unifiedTopology and useNewUrlParser are the configuration properties added to prevent deprecation warnings

And with that you are connected to the database.

To verify that add a callback function to the connect()  method

                  { useUnifiedTopology: true },

                  { useNewUrlParser: true },

                  function() { console.log('connected...') }

So, when you are connected successfully, it logs as connected!

With that you have now linked your application to the database :)

This Blog will help you connect your Nodejs application to the mongodb atlas which is a cloud database...

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mongoparseerror: uri does not have domain name, hostname and tld

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Connecting NodeJs App With MongoDB Atlas

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