Lock is an embeddable login form that can be configured to your needs. Lock enables you to easily add social , so that your users can log in seamlessly using any desired provider.
Embedded login for web applications uses cross-origin authentication unless you configure a custom domain for your tenant. Cross-origin authentication uses third-party cookies to allow for secure authentication transactions across different origins.

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Lock Installation

You can install Lock via several methods. Select any of the following installation sources that best suit your environment and application.

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Installation Sources

Install via npm: npm install auth0-lock Install via bower: bower install auth0-lock Include via our CDN (Replace .x and .y with the latest minor and patch release numbers from the Lock Github repository: Latest Minor Release:<script src="https://cdn.auth0.com/js/lock/11.x/lock.min.js"></script>Latest Patch Release: <script src="https://cdn.auth0.com/js/lock/11.x.y/lock.min.js"></script> It is recommended that production applications use a specific patch version, or at the very least a specific minor version. Regardless of the method by which Lock is included, the recommendation is that the version should be locked down and only manually updated, to ensure that those updates do not adversely affect your implementation. Check the GitHub repository for a current list of releases.

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Mobile

If you are targeting mobile audiences, Auth0 recommends that you add the following meta tag to your application’s head: <meta name="viewport" content="width=device-width, initial-scale=1"/>

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Bundling Dependencies

If you are using browserify or webpack to build your project and bundle its dependencies, after installing the auth0-lock module, you will need to bundle it with all its dependencies. Examples are available for Browserify and webpack.

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Cross-Origin Authentication

Embedded login for web applications uses cross-origin authentication unless you configure a custom domain for your tenant. Cross-origin authentication uses third-party cookies to allow for secure authentication transactions across different origins.
Embedding Lock within your application requires cross-origin authentication to be properly configured. Specifically, you need to set the Allowed Web Origins property to the domain making the request. You can find this field in the Application Settings.

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Usage

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Step 1. Initializing Lock

First, you’ll need to initialize a new Auth0Lock object, and provide it with your Auth0 (the unique client ID for each Auth0 application, which you can get from the management dashboard) and your Auth0 domain (for example yourname.auth0.com). 
// Initializing our Auth0Lock
var lock = new Auth0Lock(
  '{yourClientId}',
  '{yourDomain}'
);

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Step 2. Authenticating and Getting User Info

Next, listen using the on method for the authenticated event. When the event occurs, use the accessToken which was received to call the getUserInfo method and acquire the user’s profile information (as needed). 
var Auth = (function() {

  var wm = new WeakMap();
  var privateStore = {};
  var lock;

  function Auth() {
    this.lock = new Auth0Lock(
      '<{yourClientId}>',
      '<{yourDomain}>'
    );
    wm.set(privateStore, {
      appName: "example"
    });
  }

  Auth.prototype.getProfile = function() {
    return wm.get(privateStore).profile;
  };

  Auth.prototype.authn = function() {
    // Listening for the authenticated event
    this.lock.on("authenticated", function(authResult) {
      // Use the token in authResult to getUserInfo() and save it if necessary
      this.getUserInfo(authResult.accessToken, function(error, profile) {
        if (error) {
          // Handle error
          return;
        }

        //we recommend not storing Access Tokens unless absolutely necessary
        wm.set(privateStore, {
          accessToken: authResult.accessToken
        });

        wm.set(privateStore, {
          profile: profile
        });

      });
    });
  };
  return Auth;
}());
You can then manipulate page content and display profile information to the user (for example, displaying their name in a welcome message). <h2>Welcome <span id="nick" class="nickname"></span></h2> Note that if you are storing the user profile, you will want to JSON.stringify the profile object and then, when using it later, JSON.parse it, because it will need to be stored in localStorage as a string rather than a JSON object.

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Step 3. Showing Lock

Here you’re showing the Lock widget after the user clicks a login button; you can just as easily show Lock automatically when arriving at a page by just using lock.show(); on page load. This will show the Lock widget, and paired with the above, you’re now ready to handle logins! 
document.getElementById('btn-login').addEventListener('click', function() {
  lock.show();
});

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Passwordless

Lock’s Mode is only available in Lock v11.2.0 and later. Please use the latest release of Lock for this feature! You can use Lock’s Passwordless Mode to allow users to authenticate using just an email or mobile number. They will receive the code and then return to input it, or click the link, and they can be authenticated without remembering a password. In Lock, in order to implement Passwordless Mode, you initialize Lock in a slightly different manner, with Auth0LockPasswordless rather than with Auth0Lock: 
var lockPasswordless = new Auth0LockPasswordless(
 '{yourClientId}',
 '{yourDomain}'
);

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Passwordless options

Additionally, Lock’s Passwordless Mode has a couple of configuration options that are unique to it. In order to indicate which connection type you would like, you initialize Lock with the allowedConnections option with either email or sms as the value: 
var passwordlessOptions = {
  allowedConnections: ['sms']
}
Remember to enable the passwordless connection of your choice in the Dashboard under Connections -> Passwordless, and then to enable it for your application, that way when Lock tries to use it, it is already set up and linked to the application. If you choose to use email, you have one more option to select - whether you wish your users to receive a code to input, or a “magic link” to use. This is done via the passwordlessMethod option, which takes values of code or link. 
var passwordlessOptions = {
  allowedConnections: ['email'],
  passwordlessMethod: 'code'
}

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Passwordless example

var passwordlessOptions = {
  allowedConnections: ['email'],
  passwordlessMethod: 'code',
  auth: {
    redirectUrl: 'http://localhost:3000/callback',   
    responseType: 'token id_token',
    params: {
      scope: 'openid email'               
    }          
  }
}

var lockPasswordless = new Auth0LockPasswordless(
 '{yourClientId}',
 '{yourDomain}',
 passwordlessOptions
);

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Single Sign-On with embedded authentication

Apps with embedded login must meet two criteria in order to have (SSO).
  1. Both of the applications attempting SSO must be first-party applications. SSO with third-party applications will not work.
  2. They need to make use of custom domains and have both the applications which intend to have SSO as well as the Auth0 tenant on the same domain. Traditionally, Auth0 domains are in the format foo.auth0.com, but custom domains allow you to use the same domain for each of the applications in question as well as your Auth0 tenant, preventing the risk of CSRF attacks.
Our recommendation is to use instead of setting up SSO in embedded login scenarios. Universal Login is the most reliable and stable way to perform SSO, and is the only way to do so if you must use multiple domains for your applications, or use third-party applications.

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Error Codes and Descriptions

When Lock is used for embedded login, it employs the /co/authenticate endpoint, which has the following errors. The error description is human readable. It should not be parsed by any code and it subject to change at any time.
StatusCodeDescription
400invalid_requestInvalid request body. All and only of client_id, credential_type, username, otp, realm are required.
401unauthorized_clientCross origin login not allowed.
400unsupported_credential_typeUnknown credential type parameter.
400invalid_requestUnknown realm non-existent-connection.
403access_deniedWrong email or password.
403access_deniedAuthentication error
403blocked_userBlocked user
401password_leakedThis login attempt has been blocked because the password you’re using was previously disclosed through a data breach (not in this application).
429too_many_attemptsYour account has been blocked after multiple consecutive login attempts. We’ve sent you a notification via your preferred contact method with instructions on how to unblock it.
429too_many_attemptsWe have detected suspicious login behavior and further attempts will be blocked. Please contact the administrator.

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Browser Compatibility

Browser compatibility is ensured for Chrome, Safari, Firefox and IE >= 10. Auth0 currently uses zuul along with Saucelabs to run integration tests on each push.

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Learn more