Skip to content
Switch branches/tags
Go to file


Failed to load latest commit information.
Latest commit message
Commit time


A MySQL session store for express.js.

Build Status


Add to your application via npm:

npm install express-mysql-session --save

This will install express-mysql-session and add it to your application's package.json file.

Important Notes

Potential gotchas and other important information goes here.

Older Versions

For users who are still using express-mysql-session 0.x. Changes have been made to the constructor, which are backwards compatible, but you could run into troubles if using an older version of this module with the latest documentation. You can find the documentation for the older version here.

Session Table Collation

This module creates a database table to save session data. This data is stored in a MySQL text field with the utf8mb4 collation - added in MySQL 5.5.3. The reason for this is to fully support the utf8 character set. If you absolutely must use an older version of MySQL, create your sessions table before initializing the MySQLStore.


Use with your express session middleware, like this:

var express = require('express');
var app = module.exports = express();
var session = require('express-session');
var MySQLStore = require('express-mysql-session')(session);

var options = {
	host: 'localhost',
	port: 3306,
	user: 'session_test',
	password: 'password',
	database: 'session_test'

var sessionStore = new MySQLStore(options);

	key: 'session_cookie_name',
	secret: 'session_cookie_secret',
	store: sessionStore,
	resave: false,
	saveUninitialized: false

The session store will internally create a mysql connection pool which handles the (re)connection to the database. By default, the pool consists of 1 connection, but you can override this using the connectionLimit option. There are additional pool options you can provide, which will be passed to the constructor of the mysql connection pool.

The sessions database table should be automatically created, when using default options. If for whatever reason the table is not created, you can find the schema here.

With an existing MySQL connection or pool

To pass in an existing MySQL database connection or pool, you would do something like this:

var mysql = require('mysql');
var session = require('express-session');
var MySQLStore = require('express-mysql-session')(session);

var options = {
    host: 'localhost',
    port: 3306,
    user: 'db_user',
    password: 'password',
    database: 'db_name'

var connection = mysql.createConnection(options); // or mysql.createPool(options);
var sessionStore = new MySQLStore({}/* session store options */, connection);

Closing the session store

To cleanly close the session store:



Here is a list of all available options:

var options = {
	// Host name for database connection:
	host: 'localhost',
	// Port number for database connection:
	port: 3306,
	// Database user:
	user: 'session_test',
	// Password for the above database user:
	password: 'password',
	// Database name:
	database: 'session_test',
	// Whether or not to automatically check for and clear expired sessions:
	clearExpired: true,
	// How frequently expired sessions will be cleared; milliseconds:
	checkExpirationInterval: 900000,
	// The maximum age of a valid session; milliseconds:
	expiration: 86400000,
	// Whether or not to create the sessions database table, if one does not already exist:
	createDatabaseTable: true,
	// Number of connections when creating a connection pool:
	connectionLimit: 1,
	// Whether or not to end the database connection when the store is closed.
	// The default value of this option depends on whether or not a connection was passed to the constructor.
	// If a connection object is passed to the constructor, the default value for this option is false.
	endConnectionOnClose: true,
	charset: 'utf8mb4_bin',
	schema: {
		tableName: 'sessions',
		columnNames: {
			session_id: 'session_id',
			expires: 'expires',
			data: 'data'

Configurable sessions table and column names

You can override the default sessions database table name and column names via the schema option:

var session = require('express-session');
var MySQLStore = require('express-mysql-session')(session);

var options = {
	host: 'localhost',
	port: 3306,
	user: 'session_test',
	password: 'password',
	database: 'session_test',
	schema: {
		tableName: 'custom_sessions_table_name',
		columnNames: {
			session_id: 'custom_session_id',
			expires: 'custom_expires_column_name',
			data: 'custom_data_column_name'

var sessionStore = new MySQLStore(options);


express-mysql-session uses the debug module to output debug messages to the console. To output all debug messages, run your node app with the DEBUG environment variable:

DEBUG=express-mysql-session* node your-app.js

This will output log messages as well as error messages from express-mysql-session.

If you also might need MySQL-related debug and error messages, see debugging node-mysql.


There are a number of ways you can contribute:

  • Improve or correct the documentation - All the documentation is in this readme file. If you see a mistake, or think something should be clarified or expanded upon, please submit a pull request
  • Report a bug - Please review existing issues before submitting a new one; to avoid duplicates. If you can't find an issue that relates to the bug you've found, please create a new one.
  • Request a feature - Again, please review the existing issues before posting a feature request. If you can't find an existing one that covers your feature idea, please create a new one.
  • Fix a bug - Have a look at the existing issues for the project. If there's a bug in there that you'd like to tackle, please feel free to do so. I would ask that when fixing a bug, that you first create a failing test that proves the bug. Then to fix the bug, make the test pass. This should hopefully ensure that the bug never creeps into the project again. After you've done all that, you can submit a pull request with your changes.

Before you contribute code, please read through at least some of the source code for the project. I would appreciate it if any pull requests for source code changes follow the coding style of the rest of the project.

Now if you're still interested, you'll need to get your local environment configured.

Configure Local Environment

Step 1: Get the Code

First, you'll need to pull down the code from GitHub:

git clone

Step 2: Install Dependencies

Second, you'll need to install the project dependencies as well as the dev dependencies. To do this, simply run the following from the directory you created in step 1:

npm install

Step 3: Set Up the Test Database

Now, you'll need to set up a local test database:

	host: 'localhost',
	port: 3306,
	user: 'session_test',
	password: 'password',
	database: 'session_test'

The test database settings are located in test/config.js

Alternatively, you can provide custom database configurations via environment variables:



This project includes an automated regression test suite. To run the tests:

npm test




This software is MIT licensed:

A short, permissive software license. Basically, you can do whatever you want as long as you include the original copyright and license notice in any copy of the software/source. There are many variations of this license in use.


This project is free and open-source. If you would like to show your appreciation by helping to fund the project's continued development and maintenance, you can find available options here.