Availability varies by Auth0 plan

Your Auth0 plan or custom agreement affects whether this feature is available. To learn more, read Pricing.
If you have your own user database, you can use it as an in Auth0 to authenticate users. In this process, you will create the custom database connection, create database action scripts, and add configuration parameters.
Make sure that your database has the appropriate fields to store user profiles attributes, such as id, nickname, email, and password. To learn about Auth0’s user profile schema, read Normalized User Profiles. To learn more about updating user profiles, read Update User Profiles Using Your Database.
Auth0 allows you to create connections and scripts for most of the commonly-used databases, including:
  • ASP.NET Membership Provider
  • MongoDB
  • MySQL
  • PostgreSQL
  • SQLServer
  • Windows Azure SQL Database
  • Web services accessed via Basic Auth
You can connect to any kind of database or web service with a properly-configured custom script. Note that input sanitization must be completed on the customer end; Auth0 does not sanitize or validate any username/password combination passed by a custom database. Custom Database scripts are subject to Auth0’s Rate Limit Policy.

Network firewall

If you are behind a firewall, this feature may require that you add the appropriate Auth0 IP addresses to the Allow List to work properly.

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Create the connection in the Auth0 Dashboard

  1. Navigate to Auth0 Dashboard > Authentication > Database, and select Create DB Connection.
  2. Configure the connection’s settings, and click Create:
ParameterDefinition
NameThe name of the connection. The name must start and end with an alphanumeric character, contain only alphanumeric characters and dashes, and not exceed 35 characters.
Requires UsernameForces users to provide a username and email address during registration.
Username LengthSets the minimum and maximum length for a username.
Disable Sign UpsPrevents signups to your application. You will still be able to create users with your API credentials or via the Auth0 Dashboard.
Once Auth0 creates your connection, you’ll have the following views (in addition to the Settings view):
  • Attributes
  • Authentication Methods
  • Custom Database
  • Applications
  1. Select the Custom Database view, and enable the Use my own database switch.
    Enable Custom Database Use My Own Database Option

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Create database action scripts

Toggling the Use my own database switch enables the Database Action Scripts area where you will create scripts to configure how authentication works when using your database. You can write your database action scripts, or you can select a template from the Templates dropdown and modifying it as necessary. You must configure a login script; additional scripts for user functionality are optional. The available database action scripts are:
NameDescriptionParameters
Login
Required		Executes each time a user attempts to log in.email, password
CreateExecutes when a user signs up.user
VerifyExecutes after a user follows the verification link.email
Change PasswordExecutes when a user clicks on the confirmation link after a reset password request.email, newPassword
Get UserRetrieves a user profile from your database without authenticating the user.email
DeleteExecutes when a user is deleted using the API or Auth0 Dashboard.id
To learn more about the scripts, read Custom Database Action Script Templates and Custom Database Action Script Execution Best Practices.

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Create a Login script

Avoid user ID collisions with multiple databases

The id (or alternatively user_id) property in the returned user profile will be used by Auth0 to identify the user.If you are using multiple custom database connections, then id value must be unique across all the custom database connections to avoid user ID collisions. Our recommendation is to prefix the value of id with the connection name (omitting any whitespace). To learn more about user IDs, read Identify Users.
The following steps use an example for a MySQL database login script
  1. After toggling the Use my own database switch, the Database Action Scripts area is enabled. Make sure you are on the Login tab.
  2. Use the Templates dropdown to select the MySQL database script template. 
    function login(email, password, callback) {
  var bcrypt = require('bcrypt');
  var mysql = require('mysql');
  var connection = mysql.createConnection({
    host: 'localhost',
    user: 'me',
    password: 'secret',
    database: 'mydb'
  });
  connection.connect();
  var query = "SELECT id, nickname, email, password " +
    "FROM users WHERE email = ?";
  connection.query(query, [email], function (err, results) {
    if (err) return callback(err);
    if (results.length === 0) return callback(new WrongUsernameOrPasswordError(email));
    var user = results[0];
    bcrypt.compare(password, user.password, function (err, isValid) {
      if (err) {
        callback(err);
      } else if (!isValid) {
        callback(new WrongUsernameOrPasswordError(email));
      } else {
        callback(null, {
          // This prefix (replace with your own custom DB name)
          // ensure uniqueness across different custom DBs if there's the
          // possibility of collisions (e.g. if the user ID is an email address or an integer)
          id: 'MyConnection1|' + user.id.toString(),
          nickname: user.nickname,
          email: user.email
        });
      }
    });
  });
}
    The above script connects to a MySQL database and executes a query to retrieve the first user with email == user.email. With the bcrypt.compareSync method, it then validates that the passwords match, and if successful, returns an object containing the user profile information including id, nickname, and email. This script assumes that you have a users table containing these columns. The id returned by Login script is used to construct the user ID attribute of the user profile.
  3. Click Save and Try.
  4. In the pop-up modal, enter your email and password and click Try. This provides a dropdown to select from a list of available runtimes, with your current runtime on top.
    Modal to try the login script.
Script templates are not used by Auth0 until you click Save or Try. This is true even if you only modify one script and haven’t made changes to any others. You must click Save at least once for all the scripts to be in place.

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Custom database support for Organizations

If you use custom database connections in conjunction with Organizations, you can use the context parameter in the script signature to make Organization details like id, name, and metadata available to your custom database action scripts. Organization data is passed in the context object when the associated action happens in the context of an organization; for example, when a user authenticates on an organization’s login prompt, the login action script is passed. To learn more, read Database Connections.

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Enable context object

  1. Navigate to Auth0 Dashboard > Authentication > Database.
  2. Select your database connection.
  3. Under the Custom Database tab, find Context objects in database scripts and select Enable.
    This feature cannot be disabled once toggled.

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Use Organization context

Once the context object is enabled in Dashboard, you can add a context object to your custom database action scripts, inserted directly preceding the callback parameter. When events are triggered with Organization context, the corresponding data is made available to your custom database action scripts in the format below: 
{
    "organization": {
        "display_name": "My Organization",
        "id": "org_XXXXXX",
        "metadata": {
            "example": "value"
        },
        "name": "my-organization"
    }
}
An empty context will always be passed to the delete script.

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Add configuration parameters

You can store parameters, like the credentials required to connect to your database, in the Settings section below the script editor. These will be available for all of your scripts, and you can access the parameter values using the configuration object in your database action scripts (i.e., configuration.MYSQL_PASSWORD). Use the added parameters in your scripts to configure the connection. For example, you might add the following to the MySQL Login script: 
function login (username, password, callback) {
  var mysql = require('mysql');
  var connection = mysql.createConnection({
    host     : configuration.MYSQL_HOST,
    user     : 'me',
    password : configuration.MYSQL_PASSWORD,
    database : 'mydb'
  });
}

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Learn more