How To Connect MySQL Database in Node Js App

In this article, we will explain to you how to connect MySQL database in node js application. If you want to use MySQL server with your node.js application, you need to learn MySQL node.js connection.

We can easily connect MySQL database using the MySQL NPM package in node js application. MySQL is a nodejs npm package and it is written in JavaScript so that we can easily connect MySQL with node js.

Node Js Application Setup

First, we will open the command prompt and create the application in our directory. for this, you can follow the below command.

mkdir my_node_app
cd my_node_app
npm init

mkdir my_node_app

cd my_node_app

npm init

Install NPM Package

After the done setup node js application, we will install the express and MySQL npm package. so you can see the following npm command.

npm install express mysql --save

1	npm install express mysql --save

Create Database Connection

In this step, We will create a config.js file in the node js application. after that, we will configure the database connection.

var mysql = require('mysql'); 
var conn = mysql.createConnection({
    host: 'host_name', 
    user: 'database_username', 
    password: 'database_password',
    database: 'database_name' 
}); 
conn.connect(function(err) { 
  if (err) throw err;
  console.log('Database is connected successfully !'); 
}); 
module.exports = conn;

var mysql = require('mysql');

var conn = mysql.createConnection({

host: 'host_name',

user: 'database_username',

password: 'database_password',

database: 'database_name'

});

conn.connect(function(err) {

if (err) throw err;

console.log('Database is connected successfully !');

});

module.exports = conn;

How to Connect Node.js to MySQL Database

In this step, We will create a server.js file and set up the node js application using express.

var express=require('express');
var app = express();
var dbConn = require('./config');

app.get('/get_data',function(req,res){
	dbConn.query('SELECT * FROM students', function (err, results) {
	 if(err) {
		 throw err;
	 } else {
		return res.send({ status: true, data: results});
	 }
    });
});

app.listen(3000,function(){
	console.log("Express Started on Port 3000");
});

var express=require('express');

var app = express();

var dbConn = require('./config');

app.get('/get_data',function(req,res){

dbConn.query('SELECT * FROM students', function (err, results) {

if(err) {

throw err;

} else {

return res.send({ status: true, data: results});

}

});

app.listen(3000,function(){

console.log("Express Started on Port 3000");

});

Run Node js Application

we will run the node js application using the below command. so you can follow the below command.

node server.js

1	node server.js

Now you can run the example using the below Url in the browser.

http://localhost:3000/get_data

1	http://localhost:3000/get_data