Node js Delete Data by id into MongoDB Tutorial

In this tutorial, you will learn how to delete data from Mongodb database using mongoose module in node express js.

How to Delete Data From MongoDB Mongoose Using Node js

Steps to delete data by id in mongoDB:

Step 1 – Create Node Express js App

Run the following command on cmd to create node js app:

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

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

Run the following command on the cmd 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

Step 3 – Connect App to MongoDB

Create database.js file in 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;

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Step 4 – Create Model

Create Models directory and inside this directory create userModel.js file:

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 list.ejs view file with a delete button in views directory:

<!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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