Node js Delete Data by id into MongoDB Tutorial

Node js Delete Data by id into MongoDB Tutorial

Delete data by _id into mongoDB database with mongoose in node js express app; This tutorial will guide you on how delete data from mongodb database using mongoose module in node js express.

This tutorial will create a html table using bootstrap 4 library and display a list with the delete button. Then create a route and import in app.js file to delete data from mongodb mongoose in node js express app.

How to Delete Data From Mongodb Mongoose Using Node js

  • Step 1 – Create Node Express js App
  • Step 2 – Install express flash validator ejs body-parser mongoose dependencies
  • Step 3 – Connect App to MongoDB
  • Step 4 – Create Model
  • Step 5 – Create List and Delete Routes
  • Step 6 – Create Views
    • Create List Page and Delete Button
  • Step 7 – Import Modules in App.js
  • Step 8 – Start App Server

Step 1 – Create Node Express js App

Execute the following command on terminal to create node js app:

mkdir my-app
cd my-app
npm init -y

Step 2 – Install express flash ejs body-parser mongoose Modules

Execute the following command on the terminal to express flash ejs body-parser mysql dependencies :

npm install -g express-generator
npx express --view=ejs

npm install

npm install express-flash --save
npm install express-session --save
npm install body-parser --save
npm install mongoose
npm install express-validator cors --save

body-parser – Node.js request body parsing middleware which parses the incoming request body before your handlers, and make it available under req.body property. In other words, it simplifies the incoming request.

Express-Flash – Flash Messages for your Express Application. Flash is an extension of connect-flash with the ability to define a flash message and render it without redirecting the request.

Express-Session– Express-session – an HTTP server-side framework used to create and manage a session middleware.

Express-EJS– EJS is a simple templating language which is used to generate HTML markup with plain JavaScript. It also helps to embed JavaScript to HTML pages

Mongoose – Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Mongoose supports both promises and callbacks.

Step 3 – Connect App to MongoDB

Create database.js file into your app root directory and add the following code into it to connect your app to the mongodb database:

var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/users', {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;

Step 4 – Create Model

Create Models directory and inside this directory create userModel.js file; Then add following code into it:

const mongoose = require("../database");

// create an schema
var userSchema = new mongoose.Schema({
            name: String,
            email:String
        });

var userModel=mongoose.model('users',userSchema);

module.exports = mongoose.model("Users", userModel);

Step 5 – Create List and Delete Routes

Create routes; so visit routes directory and open users.js route file; Then add the following routes into it:

var express = require('express');
var router = express.Router();
var mongoose = require('mongoose');
var userModel = require('../models/userModel');


/* GET home page. */
router.get('/', function(req, res, next) {
     
    userModel.find((err, docs) => {
        if (!err) {
            res.render("users/list", {
                data: docs
            });
        } else {
            console.log('Failed to retrieve the Users List: ' + err);
        }
    });

});

// DELETE USER
router.get('/delete/(:id)', function(req, res, next) {
    userModel.findByIdAndRemove(req.params.id, (err, doc) => {
        if (!err) {
            res.redirect('/users/list');
        } else {
            console.log('Failed to Delete user Details: ' + err);
        }
    });
})

module.exports = router;

Step 6 – Create Views

Create some views; so visit views directory of your app and create list.ejs into it.

Create List Page and Delete Button

Create html markup for display list from mongodb database; So visit views directory and create list.ejs file inside it. Then add the following code into it:

<!DOCTYPE html>
<html>

<head>
	<title>node js mongodb delete by _id</title>
	<link rel='stylesheet' href='/stylesheets/style.css' />
	<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
	<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
	<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous"> </head>

<body>
	<div> <a href="/" class="btn btn-primary ml-3">Home</a> </div>
	<!--   <% if (messages.error) { %>
  <p style="color:red"><%- messages.error %></p>
<% } %> -->
	<% if (messages.success) { %>
		<p class="alert alert-success mt-4">
			<%- messages.success %>
		</p>
		<% } %>
			<br>
			<table class="table">
				<thead>
					<tr>
						<th scope="col">#</th>
						<th scope="col">Name</th>
						<th scope="col">Email</th>
						<th width="200px">Action</th>
					</tr>
				</thead>
				<tbody>
					<% if(data.length){

  for(var i = 0; i< data.length; i++) {%>
						<tr>
							<th scope="row">
								<%= (i+1) %>
							</th>
							<td>
								<%= data[i].name%>
							</td>
							<td>
								<%= data[i].email%>
							</td>
							<td> <a class="btn btn-success delete" href="../users/delete/<%= data[i]._id%>">Delete</a> </td>
						</tr>
						<% }
          
   }else{ %>
							<tr>
								<td colspan="3">No user</td>
							</tr>
							<% } %>
				</tbody>
			</table>
</body>

</html>

Step 5 – Import Modules in App.js

Import express flash session body-parser mongoose dependencies in app.js; as shown below:

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var bodyParser = require('body-parser');
var flash = require('express-flash');
var session = require('express-session');
var usersRouter = require('./routes/users');


var app = express();


// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use(session({ 
    secret: '123456catr',
    resave: false,
    saveUninitialized: true,
    cookie: { maxAge: 60000 }
}))

app.use(flash());
app.use('/list', usersRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;

Step 7 – Start App Server

You can use the following command to start node js app server:

//run the below command

npm start

after run this command open your browser and hit 

http://127.0.0.1:3000/list

Conclusion

Node js mongodb delete by _id using mongoose; In this tutorial, you have learned how to how delete data from mongodb database by _id using mongoose in node js express app.

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AuthorAdmin

My name is Devendra Dode. I am a full-stack developer, entrepreneur, and owner of Tutsmake.com. I like writing tutorials and tips that can help other developers. I share tutorials of PHP, Python, Javascript, JQuery, Laravel, Livewire, Codeigniter, Node JS, Express JS, Vue JS, Angular JS, React Js, MySQL, MongoDB, REST APIs, Windows, Xampp, Linux, Ubuntu, Amazon AWS, Composer, SEO, WordPress, SSL and Bootstrap from a starting stage. As well as demo example.

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