In order to set up custom domains, and depending on the Auth0 features you are using, there might be additional configuration steps you must follow. This article lists the required configuration you must do per feature.

If you have been using Auth0 for some time and decide to enable a custom domain, you will have to migrate your existing apps and update the settings as described below. Note that existing sessions created at YOUR_AUTH0_DOMAIN will no longer be valid once you start using your custom domain, so users will have to login again.

Prerequisites

You have already configured and verified your custom domain. If not, see How to configure custom domains.

Which section is relevant to me?

Feature Section to read
You use universal login and you have customized the login page Universal login
You use Lock embedded in your application Embedded Lock
You use Auth0.js or other Auth0 SDKs Auth0.js and other SDKs
You want to use your custom domain with Auth0 emails Use custom domains in emails
You want to use social identity providers with your custom domain Configure social identity providers
You want to use SAML identity providers with your custom domain Configure SAML identity providers
You want to use SAML applications with your custom domain Configure your SAML applications
You issue Access Tokens for your APIs or you access the Auth0 APIs from your application APIs

Universal login

If you use universal login and you have customized the login page, you must update the code to use your custom domain.

If you are using Lock, the additional values required in the initialization can be seen in the following sample script:

var lock = new Auth0Lock(config.clientID, config.auth0Domain, {
  //code omitted for brevity
  configurationBaseUrl: config.clientConfigurationBaseUrl,
  overrides: {
  	__tenant: config.auth0Tenant,
  	__token_issuer: config.auth0Domain
  },
  //code omitted for brevity
});

If you use Auth0.js on the hosted login page, you need to set the overrides option like this:

var webAuth = new new auth0.WebAuth({
  clientID: config.clientID, 
  domain: config.auth0Domain, 
  //code omitted for brevity
  overrides: {
  	__tenant: config.auth0Tenant,
  	__token_issuer: config.auth0Domain
  },
  //code omitted for brevity
});

If you use the default login page without customization, you do not need to make any changes.

Embedded Lock

If you use Lock v11 embedded in your application, you must update the code to use your custom domain when initializing Lock. You will also need to set the configurationBaseUrl to the appropriate CDN URL.

var lock = new Auth0Lock('YOUR_CLIENT_ID', 'YOUR_CUSTOM_DOMAIN', {
  //code omitted for brevity
  configurationBaseUrl: 'https://cdn.auth0.com'
  //code omitted for brevity
});

The CDN URL varies by region. For regions outside of the US, use https://cdn.[eu|au].auth0.com (eu for Europe or au for Australia).

Auth0.js and other SDKs

If you use Auth0.js or other SDKs, you will have to initialize the SDK using your custom domain. For example, if you are using the auth0.js SDK, you need to set the following.

webAuth = new auth0.WebAuth({
  domain: 'YOUR_CUSTOM_DOMAIN',
  clientID: 'YOUR_CLIENT_ID'
});

Note that the Management API only accepts Auth0 domains. If you use a custom domain and also intend to perform Management API actions with Auth0.js, you must instantiate a new copy of webAuth using your Auth0 domain.

Use custom domains in emails

If you want to use your custom domain with your Auth0 emails, you must enable this feature.

Go to Dashboard > Tenant Settings > Custom Domains and enable the Use Custom Domain in Emails toggle. When the toggle is green, this feature is enabled.

Use Custom Domain in Emails toggle

Configure social identity providers

If you want to use social identity providers with your custom domain, you must update the Allowed Callback URLs to include your custom domain (such as https://login.northwind.com/login/callback).

You cannot use Auth0 developer keys with custom domains.

Configure SAML identity providers

If you want to use SAML identity providers (IdPs) with your custom domain, you must get the service provider metadata from Auth0 (such as https://YOUR-CUSTOM-DOMAIN/samlp/metadata?connection=YOUR-CONNECTION-NAME). This includes updated Assertion Consumer Service (ACS) URLs. Then, you have to manually update this value in your IdP(s). This change to your IdP(s) must happen at the same time as you begin using your custom domain in your applications. This can pose a problem if there are multiple IdPs to configure.

Alternatively, you can use signed requests to fulfill this requirement:

  • Once your custom domain is set up, go to Dashboard > Tenant Settings > Custom Domains and download the certificate from the link under the Sign Request toggle
  • Give the certificate to the IdP(s) to upload. This enables the IdP to validate the signature on the AuthnRequest message that Auth0 sends to the IdP
  • The IdP will import the certificate and if necessary, signature verification should be enabled (exact steps vary by IdP)
  • Turn on the Sign Request toggle in the Dashboard under Connections > Enterprise > SAMLP > CONNECTION. This will trigger Auth0 to sign the SAML AuthnRequest messages it sends to the IdP

Once this is done, and you start using your custom domain, the IdP will receive that custom domain in your signed request. Because your application is trusted, the IdP should automatically override whatever was configured as your ACS URL and replace it with the value sent in the signed request. However, there are IdPs that do not accept the ACS URL in the signed request, so you must check with yours to confirm whether this is supported or not.

If this is supported, it will prevent you from having to change one or many IdP settings all at the same time, and allow you to prepare them to accept your signed requests ahead of time. You can then at a later date have the IdPs change the ACS URL as well.

Something else to keep in mind, is that if your Identity Provider is configured to use custom domains, the Try button in the Dashboard will not work.

Configure your SAML applications

If you want to use SAML applications with your custom domain, you must update your Service Provider with new Identity Provider metadata from Auth0 (such as https://YOUR-CUSTOM-DOMAIN/samlp/metadata/YOUR-CLIENT-ID). Note that the issuer entity ID will change when using a custom domain (from something like urn:northwind.auth0.com to the custom domain such as urn:login.northwind.com).

APIs

If you use Auth0 with a custom domain to issue Access Tokens for your APIs, then you must validate the JWT issuer(s) against your custom domains. For example, if you use the express-jwt middleware, you must do the following change.

app.use(jwt({ 
  issuer: 'https://YOUR-CUSTOM-DOMAIN',
  //code omitted for brevity
}));

If you use the Auth0 APIs, such as the Management API, the API identifier will use your default tenant domain name (such as https://YOUR_AUTH0_DOMAIN/userinfo and https://YOUR_AUTH0_DOMAIN/api/v2/)

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