Migrate Single Page Applications using Lock 9 to Centralized Login

This document explains how to migrate Web Applications using Lock to centralized login. For other migration scenarios see Migrating from Embedded to Centralized Login.

When you use Lock v9 in a Web Application, your code does basically this:

  1. Initialize Lock:
var lock = new Auth0Lock('YOUR_CLIENT_ID', 'YOUR_AUTH0_DOMAIN');
  1. Show lock specifying responseType: token when a login is required:
function login() {
        callbackURL: 'https://YOUR_APP/callback',
        responseType : 'token',
        authParams: {
            scope: 'openid profile'
  1. When the page loads, attempt to parse the hash with the authentication results:
  var hash = lock.parseHash();

  if (hash) {
      if (!hash.error) {
          setSession(hash.profile, hash.id_token, hash.access_token);

          lock.getProfile(hash.id_token, function(err, profile) {
              if (!err) {
                  // use the profile

To use centralized login, you need to use auth0.js to manage the authentication flow:

  1. Initialize auth0.js, using the same parameters as when initializing Lock and also including the ones you use when you call lock.show():
var webAuth = new auth0.WebAuth({
  domain: 'YOUR_AUTH0_DOMAIN',
  clientID: 'YOUR_CLIENT_ID',
  responseType: 'token id_token',
  scope: 'openid',
  redirectUri: 'https://YOUR_APP/callback'
  1. When the page loads, attempt to parse the hash with the authentication results:
webAuth.parseHash(function(err, authResult) {
  if (authResult && authResult.accessToken && authResult.idToken) {
    setSession(authResult.idTokenPayload, authResult.idToken, authResult.accessToken);
  } else if (err) {
    // handle errors
  1. Redirect to the /authorize endpoint when you need to log the user in your application.
function login() {
  1. Review if you are using any legacy authentication flow in your application, and adjust your code accordingly.

You can find complete examples of implementing centralized login in Single Page Applications for different technologies in our Quickstarts.

Customizing the Centralized Login Page

When you integrate centralized login in your application, you redirect the user to the /authorize endpoint of your Auth0 tenant. If Auth0 needs to authenticate the user, it will show the default login page.

You can enable a custom Hosted Login Page by navigating to Hosted Pages and enabling the Customize Login Page toggle.

Hosted Login Page

Customize Lock in the Hosted Login Page

The default login page for your tenant is a template that will use Lock to provide your users with an attractive interface and smooth authentication process. You can look over that template and use it as a starting point if you choose to customize it in any way. The default template uses Lock v10, which is safe to use in the Hosted Login Page.

If you want to change any of Lock's configurable options, you can do so using the Hosted Pages editor interface. These options can alter the behavior of Lock itself, or the look and feel of the widget using the theming options. See the configuration documentation for details on how to customize Lock.

When you're done making changes to the code, click Save to persist the changes.

Hosted Login Page

Was this article helpful?