Tutorial: Register a web application in Azure Active Directory B2C

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Before your applications can interact with Azure Active Directory B2C (Azure AD B2C), they must be registered in a tenant that you manage. This tutorial shows you how to register a web application using the Azure portal.

A "web application" refers to a traditional web application that performs most of the application logic on the server. They may be built using frameworks like ASP.NET Core, Spring (Java), Flask (Python), or Express (Node.js).

Important

If you're using a single-page application ("SPA") instead (such as using Angular, Vue, or React), learn how to register a single-page application.

If you're using a native app instead (such as iOS, Android, mobile & desktop), learn how to register a native client application.

Prerequisites

  • If you don't have an Azure subscription, create a free account before you begin.

  • If you haven't already created your own Azure AD B2C Tenant, create one now. You can use an existing Azure AD B2C tenant.

Register a web application

To register a web application in your Azure AD B2C tenant, you can use our new unified App registrations. Learn more about the new experience.

App registrations

  1. Sign in to the Azure portal.

  2. If you have access to multiple tenants, select the Settings icon in the top menu to switch to your Azure AD B2C tenant from the Directories + subscriptions menu.

  3. In the Azure portal, search for, then select Azure AD B2C.

  4. Select App registrations, and then select New registration.

  5. Enter a Name for the application. For example, webapp1.

  6. Under Supported account types, select Accounts in any identity provider or organizational directory (for authenticating users with user flows).

  7. Under Redirect URI, select Web, and then enter https://jwt.ms in the URL text box.

    The redirect URI is the endpoint to which the user is sent by the authorization server (Azure AD B2C, in this case) after completing its interaction with the user, and to which an access token or authorization code is sent upon successful authorization. In a production application, it's typically a publicly accessible endpoint where your app is running, like https://contoso.com/auth-response. For testing purposes like this tutorial, you can set it to https://jwt.ms, a Microsoft-owned web application that displays the decoded contents of a token (the contents of the token never leave your browser). During app development, you might add the endpoint where your application listens locally, like https://localhost:5000. You can add and modify redirect URIs in your registered applications at any time.

    The following restrictions apply to redirect URIs:

    • The reply URL must begin with the scheme https, unless you use a localhost redirect URL.
    • The reply URL is case-sensitive. Its case must match the case of the URL path of your running application. For example, if your application includes as part of its path .../abc/response-oidc, do not specify .../ABC/response-oidc in the reply URL. Because the web browser treats paths as case-sensitive, cookies associated with .../abc/response-oidc may be excluded if redirected to the case-mismatched .../ABC/response-oidc URL.
    • The reply URL should include or exclude the trailing forward slash as your application expects it. For example, https://contoso.com/auth-response and https://contoso.com/auth-response/ might be treated as nonmatching URLs in your application.

  8. Under Permissions, select the Grant admin consent to openid and offline_access permissions check box.

  9. Select Register.

Tip

If you don't see the app(s) you created under App registrations, refresh the portal.

Create a client secret

For a web application, you need to create an application secret. The client secret is also known as an application password. The secret will be used by your application to exchange an authorization code for an access token.

App registrations

  1. In the Azure AD B2C - App registrations page, select the application you created, for example webapp1.
  2. In the left menu, under Manage, select Certificates & secrets.
  3. Select New client secret.
  4. Enter a description for the client secret in the Description box. For example, clientsecret1.
  5. Under Expires, select a duration for which the secret is valid, and then select Add.
  6. Record the secret's Value for use in your client application code. This secret value is never displayed again after you leave this page. You use this value as the application secret in your application's code.

Note

For security purposes, you can roll over the application secret periodically, or immediately in case of emergency. Any application that integrates with Azure AD B2C should be prepared to handle a secret rollover event, no matter how frequently it may occur. You can set two application secrets, allowing your application to keep using the old secret during an application secret rotation event. To add another client secret, repeat steps in this section.

Enable ID token implicit grant

You can enable implicit grant flow to use this app registration to test a user flow for testing purposes.

  1. Select the app registration you created.

  2. Under Manage, select Authentication.

  3. Under Implicit grant and hybrid flows, select both the Access tokens (used for implicit flows) and ID tokens (used for implicit and hybrid flows) check boxes.

  4. Select Save.

Note

If you enable implicit grant to test a user flow, make sure you disable the implicit grant flow settings before you deploy your app to production.

Next steps

In this article, you learned how to:

  • Register a web application
  • Create a client secret

Learn how to Create user flows in Azure Active Directory B2C