Node js Express MongoDB CRUD

Node js Express MongoDB CRUD

Read, insert update, delete in node js + express js + MongoDB with mongoose; This tutorial will guide you on how to create crud operations application in node js express and MongoDB mongoose.

CRUD (Create, Read, Update, Delete) operations allow you to work with the data stored in MongoDB. The CRUD operation documentation is categorized in two sections: Read Operations find and return documents stored within your MongoDB database. Write Operations insert, modify, or delete documents in your MongoDB database.

This example tutorial will create a simple crud operation app in node js express using mongoose and mongodb. And you will learn how to build crud operation app with mongodb using mongoose in node js express app.

Node js Express + Mongodb + CRUD Operation Application With Mongoose Example

  • Step 1 – Create Node Express js App
  • Step 2 – Install express Validator flash ejs body-parser mongoose dependencies
  • Step 3 – Connect App to MongoDB
  • Step 4 – Create Model
  • Step 5 – Create Fetch Insert Update Delete Routes
  • Step 6 – Create Views
  • 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 Validator 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 express-validator cors --save
npm install mongoose

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/test', {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 Fetch Insert Update Delete Routes

Create fetch insert update, delete routes from MongoDB in node js; so visit routes directory and open users.js route file; Then add the following insert update, delete in node js MongoDB 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", {
data: docs
});
} else {
console.log('Failed to retrieve the Users List: ' + err);
}
});
});
// SHOW ADD USER FORM
router.get('/add', function(req, res, next) {
// render to views/user/add.ejs
res.render('users/add', {
title: 'Add New User',
name: '',
email: ''
})
})
// ADD NEW USER POST ACTION
router.post('/add', function(req, res, next) {
req.assert('name', 'Name is required').notEmpty() //Validate name
req.assert('email', 'A valid email is required').isEmail() //Validate email
var errors = req.validationErrors()
if (!errors) { //No errors were found.  Passed Validation!
var userDetails = new userModel({
name: req.body.name,
email: req.body.email,
});
userDetails.save((err, doc) => {
if (!err)
req.flash('success', 'User added successfully!');
res.redirect('/users');
else
res.render('users/add', {
title: 'Add New User',
name: user.name,
email: user.email
})
});
} else { //Display errors to user
var error_msg = ''
errors.forEach(function(error) {
error_msg += error.msg + '<br>'
})
req.flash('error', error_msg)
res.render('users/add', {
title: 'Add New User',
name: req.body.name,
email: req.body.email
})
}
})
// SHOW EDIT USER FORM
router.get('/edit/(:id)', function(req, res, next) {
userModel.findById(req.params.id, (err, doc) => {
if (!err) {
res.render("users/edit", {
title: "Update User Details",
data: doc
});
} else {
req.flash('error', 'User not found with id = ' + req.params.id)
res.redirect('/users')
}
});
})
// EDIT USER POST ACTION
router.post('/update/:id', function(req, res, next) {
req.assert('name', 'Name is required').notEmpty() //Validate nam
req.assert('email', 'A valid email is required').isEmail() //Validate email
var errors = req.validationErrors()
if (!errors) {
var user = {
name: req.sanitize('name').escape().trim(),
email: req.sanitize('email').escape().trim()
}
userModel.findByIdAndUpdate(req.body.id, {
name: req.body.name
} {
email: req.body.email
}, function(err, data) {
if (err) {
req.flash('error', 'Something Goes to Wrong!');
res.render('users');
} else {
req.flash('success', 'User has been updated successfully!');
res.redirect('/users');
}
});
} else { //Display errors to user
var error_msg = ''
errors.forEach(function(error) {
error_msg += error.msg + '<br>'
})
req.flash('error', error_msg)
/**
* Using req.body.name 
* because req.param('name') is deprecated
*/
res.render('users/edit', {
title: 'Edit user',
id: req.params.id,
name: req.body.name,
email: req.body.email
})
}
})
// DELETE USER
router.get('/delete/(:id)', function(req, res, next) {
userModel.findByIdAndRemove(req.params.id, (err, doc) => {
if (!err) {
res.redirect('/users');
} else {
console.log('Failed to Delete user Details: ' + err);
}
});
})
module.exports = router;

Step 6 – Create Views

Create a directory which name users; So visit views directory and create users directory inside it. Then create the following page inside users directory; as shown below:

  • index.ejs
  • add.ejs
  • edit.ejs

Visit views/users directory and open index.ejs and add the following code into it:

<!DOCTYPE html>
<html>
<head>
<title>Fetch and display data in html table from mongodb in node js express</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 edit" href="../users/edit/<%= data[i]._id%>">Edit</a>
<a class="btn btn-danger delete" href="../users/delte/<%= data[i]._id%>">delete</a>
</td>
</tr>
<% }
}else{ %>
<tr>
<td colspan="3">No user</td>
</tr>
<% } %>
</tbody>
</table>
</body>
</html>

Visit views/users directory and open add.ejs and add the following code into it:

<!DOCTYPE html>
<html lang="en">
<head>
<title>Node.js insert Data from Html Form to Mongodb Database - Tutsmake.com</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
</head>
<body>
<div class="container mt-4">
<div class="card">
<div class="card-body">
<% if (messages.success) { %>
<p class="alert alert-success m2-4 mb-2"><%- messages.success %></p>
<% } %>
<form action="users/add" method="POST">
<div class="form-group">
<label for="firstName">Name</label>
<input type="text" class="form-control col-lg-9" id="name" aria-describedby="emailHelp" placeholder="Enter first name" name="name">
</div>
<div class="form-group">
<label for="exampleInputEmail1">Email address</label>
<input type="email" class="form-control col-lg-9" id="exampleInputEmail1" aria-describedby="emailHelp" name="email" placeholder="Enter email">
</div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
</div>
</div>
</body>
</html>

Visit views/users directory and open edit.ejs and add the following code into it:

<!DOCTYPE html>
<html>
<head>
<title>Node.js update Data from Html Form to Mongodb Database - Tutsmake.com</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>
<form action="/users/update/<%= data._id %>" method="post" name="form1">
<div class="form-group">
<label for="exampleInputPassword1">Name</label>
<input type="text" class="form-control" name="name" id="name" value="<%= data.name %>" placeholder="Name">
</div>
<div class="form-group">
<label for="exampleInputEmail1">Email address</label>
<input type="email" class="form-control" name="email" id="email" aria-describedby="emailHelp" placeholder="Enter email" value="<%= data.email %>">
</div>
<button type="submit" class="btn btn-info">Update</button>
</form>
</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('/', 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/

Conclusion

Node js crud mongodb example; In this tutorial you have learned how to create crud operations in node js express and mongodb mongoose.

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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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