Node.js Express CRUD Example With MySQL

Node js express crud with bootstrap & MySQL; In this example tutorial guide, you will learn how to make crud (create, update, read, delete) web applications in node js express js framework with MySQL database and bootstrap 4 libraries.

Node js express crud tutorial MySQL will create a crud customer management application. Which you can add customers, edit customers and also delete customers from the database using node js express with MySQL database with Bootstrap.

Crud operation in node js using express MySQL tutorial will help to create a crud operation application in node js express with MySQL database + bootstrap.

Node.js Express CRUD Example With MySQL

Let’s follow the following steps to create CRUD operation application in Node.JS express, bootstrap with MySQL:

• Step 1 – Create Node JS App
• Step 2 – Install Required Libraries
• Step 3 – Connect to Node js Express Mysql CRUD App
• Step 4 – Create Server.js File
• Step 5 – Create CRUD Routes
• Step 6 – Create views
• Step 7 – Start Node Express js Crud + MySQL app

Step 1 – Create Node JS App

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

Use the below command and create your express project with name expressfirst

express --view=ejs expressfirst

After successfully created expressfirst folder in your system. Next follow the below commands and install node js in your project :

cd expressfirst

npm install  

Step 2 – Install Required Libraries

Install flash, validator, session, override MySQL Libraries into your node js express crud + MySQL application by executing the following command on terminal:

 npm install express-flash --save
 npm install express-session --save
 npm install express-validator --save
 npm install method-override --save
 npm install mysql --save

Step 3 – Connect to Node js Express MySQL CRUD App

Create one folder name lib and create a new file name db.js inside this folder. You need to connect node js to mysql using this file:

lib/db.js

 var mysql=require('mysql');
 var connection=mysql.createConnection({
   host:'localhost',
   user:'your username',
   password:'your password',
   database:'your database name'
 });
connection.connect(function(error){
   if(!!error){
     console.log(error);
   }else{
     console.log('Connected!:)');
   }
 });  
module.exports = connection; 

Step 4 – Create Server.js File

Visit your app root directory and create a new file name server.js And add the following code into it:

 var createError = require('http-errors');
 var express = require('express');
 var path = require('path');
 var cookieParser = require('cookie-parser');
 var logger = require('morgan');
 var expressValidator = require('express-validator');
 var flash = require('express-flash');
 var session = require('express-session');
 var bodyParser = require('body-parser');

 var mysql = require('mysql');
 var connection  = require('./lib/db');

 var indexRouter = require('./routes/index');
 var usersRouter = require('./routes/users');
 var customersRouter = require('./routes/customers');

 var app = express();

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

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

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

 app.use(flash());
 app.use(expressValidator());

 app.use('/', indexRouter);
 app.use('/users', usersRouter);
 app.use('/customers', customersRouter);

 // 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');
 });
// port must be set to 3000 because incoming http requests are routed from port 80 to port 8080
app.listen(3000, function () {
    console.log('Node app is running on port 3000');
});
 module.exports = app;

Step 5 – Create CRUD Routes

Create crud route file name customers.js; so visit inside routes folder and create this file. Then add the following code into it:

var express = require('express');
var router = express.Router();
var connection  = require('../lib/db');


/* GET home page. */
router.get('/', function(req, res, next) {
	 
 connection.query('SELECT * FROM customers ORDER BY id desc',function(err,rows)     {

        if(err){
         req.flash('error', err); 
         res.render('customers',{page_title:"Customers - Node.js",data:''});   
        }else{
           
            res.render('customers',{page_title:"Customers - Node.js",data:rows});
        }
                           
         });
       
    });


// SHOW ADD USER FORM
router.get('/add', function(req, res, next){    
    // render to views/user/add.ejs
    res.render('customers/add', {
        title: 'Add New Customers',
        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 user = {
            name: req.sanitize('name').escape().trim(),
            email: req.sanitize('email').escape().trim()
        }
        
     connection.query('INSERT INTO customers SET ?', user, function(err, result) {
                //if(err) throw err
                if (err) {
                    req.flash('error', err)
                    
                    // render to views/user/add.ejs
                    res.render('customers/add', {
                        title: 'Add New Customer',
                        name: user.name,
                        email: user.email                    
                    })
                } else {                
                    req.flash('success', 'Data added successfully!');
                    res.redirect('/customers');
                }
            })
    }
    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('customers/add', { 
            title: 'Add New Customer',
            name: req.body.name,
            email: req.body.email
        })
    }
})

// SHOW EDIT USER FORM
router.get('/edit/(:id)', function(req, res, next){
  
connection.query('SELECT * FROM customers WHERE id = ' + req.params.id, function(err, rows, fields) {
            if(err) throw err
            
            // if user not found
            if (rows.length <= 0) {
                req.flash('error', 'Customers not found with id = ' + req.params.id)
                res.redirect('/customers')
            }
            else { // if user found
                // render to views/user/edit.ejs template file
                res.render('customers/edit', {
                    title: 'Edit Customer', 
                    //data: rows[0],
                    id: rows[0].id,
                    name: rows[0].name,
                    email: rows[0].email                    
                })
            }            
        })
 
})

// EDIT USER POST ACTION
router.post('/update/:id', function(req, res, next) {
    req.assert('name', 'Name is required').notEmpty()           //Validate nam           //Validate age
    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()
        }
        
connection.query('UPDATE customers SET ? WHERE id = ' + req.params.id, user, function(err, result) {
                //if(err) throw err
                if (err) {
                    req.flash('error', err)
                    
                    // render to views/user/add.ejs
                    res.render('customers/edit', {
                        title: 'Edit Customer',
                        id: req.params.id,
                        name: req.body.name,
                        email: req.body.email
                    })
                } else {
                    req.flash('success', 'Data updated successfully!');
                    res.redirect('/customers');
                }
            })
        
    }
    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('customers/edit', { 
            title: 'Edit Customer',            
            id: req.params.id, 
            name: req.body.name,
            email: req.body.email
        })
    }
})
	  
// DELETE USER
router.get('/delete/(:id)', function(req, res, next) {
    var user = { id: req.params.id }
    
connection.query('DELETE FROM customers WHERE id = ' + req.params.id, user, function(err, result) {
            //if(err) throw err
            if (err) {
                req.flash('error', err)
                // redirect to users list page
                res.redirect('/customers')
            } else {
                req.flash('success', 'Customer deleted successfully! id = ' + req.params.id)
                // redirect to users list page
                res.redirect('/customers')
            }
        })
   })


module.exports = router;

Step 6 – Create views

Now, you need to create one folder name customers inside the views folder. And then need to create three views file name add.ejs, edit.ejs and index.ejs.

Create first file index.ejs

Index.ejs file, you will display the list of customers.

<!DOCTYPE html>
<html>
<head>
  <title>Customers</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>  
    <a href="/customers/add" class="btn btn-secondary ml-3">New Customer</a> 
    <a href="/customers" class="btn btn-info ml-3">Customer List</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="../customers/edit/<%=data[i].id%>">Edit</a>                       
    <a class="btn btn-danger delete" onclick="return alert('Are You sure?')" href="../customers/delete/<%=data[i].id%>">Delete</a>                       
   </td>
  </tr>
  <% }
          
   }else{ %>
       <tr>
          <td colspan="3">No user</td>
       </tr>
    <% } %>    
 
</tbody>
</table>
</body>
</html>

Create second file name add.ejs

Add.ejs file, you will create form for sending to data in database.

<!DOCTYPE html>
<html>
<head>
  <title>Customers</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>
  <% if (messages.error) { %>
  <p style="color:red"><%- messages.error %></p>
<% } %>
 
<% if (messages.success) { %>
    <p style="color:green"><%- messages.success %></p>
<% } %>
<form action="/customers/add" method="post" name="form1">
<div class="form-group">
  <label for="exampleInputPassword1">Name</label>
  <input type="text" class="form-control" name="name" id="name" value="" placeholder="Name">
</div>
<div class="form-group">
  <label for="exampleInputEmail1">Email address</label>
  <input type="email" name="email" class="form-control" id="email" aria-describedby="emailHelp" placeholder="Enter email" value="">
</div>

<input type="submit" class="btn btn-primary" value="Add">
</form>
</body>
</html>

Create third file name edit.ejs

Next, create file name edit.ejs, you will edit data in this form.

<!DOCTYPE html>
<html>
<head>
  <title>Customers</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="/customers/update/<%= 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="<%= 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="<%= email %>">
 
</div>

<button type="submit" class="btn btn-info">Update</button>
</form>
</body>
</html>

Step 7 – Start Node Express js Crud + MySQL app

run the below command

npm start

after run this command open your browser and hit 

http://127.0.0.1:3000/customers

Node js express crud tutorial mysql will looks like:

Conclusion

Node js + express crud with MySQL tutorial; you have learned how to build crud (create, read, update, delete) application with mysql database in node express js.

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