To connect MongoDB database with an Express application we need a npm module called mongoose.js
How to install mongoose.js
<pre><code>npm install mongoose
</code></pre>After installing mongoose,all we need is to add this code into the application main server file(generally app.js)
<pre><code>let mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/Name-of-dataBase-of-your-choice',(error)=&gt;{
 if(error){
 console.log(error);
}else{
 console.log('Database connected successfully');
}
})
</code></pre>If everything went well, you will see a message in the terminal - Database connected successfully
⚠️ Before trying to connect application with database , we first ensure that demon process of mongodb is running.
Command to run demon process(for Linux users) - 
<ol>
<li>Open terminal</li>
<li>Type command</li>
</ol>
<pre><code>sudo systemctl start mongod
</code></pre>Happy Coding

To connect MongoDB database with an Express application we need a npm module called mongoose.js

**How to install mongoose.js**

```
npm install mongoose
``` 
After installing mongoose,all we need is to add this code into the application main server file(generally app.js)


```
let mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/Name-of-dataBase-of-your-choice',(error)=>{
     if(error){
         console.log(error);
}else{
        console.log('Database connected successfully');
}
})
``` 
If everything went well, you will see a message in the terminal - **Database  connected successfully**

⚠️ Before trying to connect application with database , we first ensure that demon process of mongodb is running.

**Command to run demon process(for Linux users) - **


1. Open terminal
2. Type command


```
sudo systemctl start mongod

``` 

*Happy Coding*



Connecting MongoDB with Express app using Mongoose JS