Fetch data from MongoDB Using Mongoose and Node.js Express - Kiến Thức Cho Người lao Động Việt Nam

In this tutorial, you will learn to fetch data from MongoDB using Mongoose and Node.js Express with a simple example. This example will give you the best idea to fetch other bulk data from the table. Even you will get a free script to implement it.
This tutorial helps you to write the script in the Express MVC pattern. Even all the script is written with a separate Model, View & controller file that will be very easy to understand. So, You will easily learn How to fetch data from MongoDB Using Mongoose Node.js Express.

fetch data from mongodb using mongoose

Nội Dung Chính

How to Fetch Data From MongoDB Using Mongoose

Mongoose is the best solution to fetch MongoDB data. So, You should use it for writing the fetching query. Before getting started, you will have to configure the required things to execute Node.js Express on your computer.

Before getting started, you must configure the following basic steps

Install Node.js on your device
Install MongoDB Community Server
Also, Install MongoDB Compass and create a Database with the name nodeapp & Collection with the name users
Insert Data into MongoDB Table

1. Install Express Application

First of all, you have to Install Express Application. After that, create the following folders & files

nodeapp/
  |__controllers/
  |     |__fetch-controller.js
  |__models/
  |     |__fetch-model.js
  |__routes/
  |     |__fetch-route.js
  |__views/
  |     |__user-table.ejs
  |__database.js

2. Connect Node.js to MongoDB database

Now, you have to connect Node.js to the MongoDB database using the following script

File Name – database.js

var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/nodeapp', {useNewUrlParser: true});
var conn = mongoose.connection;
conn.on('connected', function() {
    console.log('database is connected successfully');
});
conn.on('disconnected',function(){
    console.log('database is disconnected successfully');
})
conn.on('error', console.error.bind(console, 'connection error:'));
module.exports = conn;

3. Create a Model to Fetch Data

Create a model to fetch data using the following points –

Include mongoose module using require('mongoose')
Also, Include a MongoDb database connection file using require('../database')
Create a schema with collection columns like full_name, email_address, city & country.
Pass MongoDB table users & userSchema to the mongoose.model()
Write a mongoose query within module.exports{} to fetch data from the MongoDB database

File Name – fetch-model.js

var mongoose=require('mongoose');
var db = require('../database');
// create an schema
var userSchema = new mongoose.Schema({
            full_name: String,
            email_address:String,
            city:String,
            country:String
        });
userTable=mongoose.model('users',userSchema);
        
module.exports={
     
     fetchData:function(callback){
        var userData=userTable.find({});
        userData.exec(function(err, data){
            if(err) throw err;
            return callback(data);
        })
        
     }
}

4. Create a Controller to Fetch Data

Create a controller to fetch data using the following points –

Include a model file using require('../models/fetch-model')
Create a method fetchData within module.exports{}
Write mongoose query within fetchData to fetch data from the MongoDB table and pass to the view with userData

File Name – fetch-controller.js

var fetchModel= require('../models/fetch-model');
module.exports={
 
    fetchData:function(req, res){
      
      fetchModel.fetchData(function(data){
          res.render('user-table',{userData:data});
      })
    }
}

5. Display Data in HTML Table

Display data in an HTML table with the help of fetchData that comes from the controller.

File Name – user-table.ejs

<!DOCTYPE html>
<html lang="en">
<head>
  <title></title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
 <style type="text/css">
     table, td, th {  
     border: 1px solid #ddd;
     text-align: left;
   }
   
   table {
     border-collapse: collapse;
     width: 50%;
    
   }
   .table-data{
       position: relative;
     left:50px;
     top:50px;
   }
   th, td {
     padding: 15px;
   }
 </style>
</head>
<body>
<!--====form section start====-->
    <div class="table-data">
    <table border="1" >
        <tr>
            <th>S.N</th>
            <th>Full Name</th>
            <th>Email Address</th>
            <th>City</th>
            <th>Country</th>
            <th>Edit</th>
            <th>Delete</th>
        </tr>
        
        <%
        if(userData.length!=0){
        var i=1;
        userData.forEach(function(data){
        %>
        <tr>
            <td><%=i; %></td>
            <td><%=data.full_name %></td>
            <td><%=data.email_adress %></td>
            <td><%=data.city %></td>
            <td><%=data.country %></td>
            <td><a href="/edit/<%=data.id%>">Edit</a></td>
            <td><a href="/delete/<%=data.id%>">Delete</a></td>
        </tr>
        <%  i++; }) %>
        <% } else{ %>
            <tr>
                <td colspan="7">No Data Found</td>
            </tr>
        <% } %>
    </table>
    </div>
</body>
</html>

6. Create a Route to fetch Data

Create a route to fetch data with the help of the following points –

Include a controller file using require('../controllers/fetch-controller')
Create a route /fetch-data with GET method to fetch data from the MongoDB database

File Name – fetch-route

var express = require('express');
var router = express.Router();
var fetchController= require('../controllers/fetch-controller');

router.get('/fetch-data',fetchController.fetchData);

module.exports = router;

7. Include and Use the Router in app.js

Now, You have to include & use the fetched route in the main root file app.js

File Name – app.js

var fetchRouter = require('./routes/fetch-route');
app.use('/', fetchRouter);

8. Run Node.js app to Fetch Data

First, start the Node.js server. after that, Enter the following URL in your browser to display data in the HTML table

http://localhost:3000/fetch-data

My Suggestion

Dear developers, I hope you have understood the above script, Now you are able to Fetch data from MongoDB using Mongoose and Node.js express

I will share more tutorials on Node.js/Express asap. So, Continue to visit this website.

If you have any doubts or questions. You can directly ask me through the below comment box.