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Connecting to a MySQL database in NodeJS

Tony Lea

Connecting to a MySQL database in NodeJS

Connecting to a MySQL database in NodeJS is actually quite simple. First off, you'll need to make sure you have a local MySQL server on your machine and then you can follow these steps.

To start off you'll want to create a new folder, navigate to that folder in a shell prompt, and then install the NodeJS Mysql package

npm i mysql

Next, create a new file called index.js inside of our new folder with the following contents:

var mysql = require('mysql');

var connection = mysql.createConnection({
  host: "127.0.0.1",
  user: "root",
  password: ""
});

connection.connect(function(err) {
  if (err) throw err;
  console.log("Connected to MySQL Database");
});

Make sure that you've changed your database credentials in the createConnection object, and then run the following command in terminal:

node index.js

You should see a message output that says Connected to MySQL Database . And just like that you've successfully connected to your local MySQL server.

Next, we'll see how we can run a query to fetch some rows from a database. Go ahead and create a new database. In this example I am going to create a database with the name of nodemysql, I'm also going to create a table called users, with 2 columns. A primary id and a name column.

We'll need to add some dummy data into our new table. So, I will add the following data to my table:

Finally, in order to connect to our database and list out our users we can modify our index.js file to look like:

var mysql = require('mysql');

var connection = mysql.createConnection({
  host: "127.0.0.1",
  user: "root",
  password: "",
  database: "nodemysql"
});

connection.connect(function(err) {
  if (err) throw err;
  connection.query("SELECT * FROM users", function (err, result, fields) {
    if (err) throw err;
    console.log(result);
  });
});

Now we can run node index.js again, and we'll get the following output displaying the users inside of our database:

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And that's the basics of creating a MySQL connection in Node JS and running a simple select query. Very simple, right? There are obviously a lot more complicated logic you will want to perform after fetching data from the database, but that's all dependent upon how you want your application to function.