Azure B2c Custom Login Page Javascript

Javascript Programming

As a developer working with Azure B2C, I understand the importance of creating a custom login page that meets the specific needs of your application. In this article, I will guide you through the process of creating a custom login page using JavaScript in Azure B2C.

Getting Started with Azure B2C Custom Login Page

Azure B2C provides a robust authentication service that allows you to add identity management to your applications. By default, Azure B2C provides a standard login page that may not align with your application’s branding or user experience requirements. That’s where the custom login page comes in.

To create a custom login page in Azure B2C, you can leverage JavaScript to modify the UI and add functionality. JavaScript provides a powerful and flexible way to customize the login process and enhance the user experience.

Step 1: Understanding the Azure B2C Sign-In Flow

Before diving into the code, it’s important to understand the sign-in flow in Azure B2C. The process involves several steps:

  1. The user clicks on the “Sign In” button on your application’s login page.
  2. Azure B2C redirects the user to the Azure B2C login page.
  3. The user enters their credentials and submits the form.
  4. Azure B2C validates the user’s credentials and issues a token if the authentication is successful.
  5. The user is redirected back to your application with the token.

Now that we have a clear understanding of the sign-in flow, let’s move on to creating our custom login page.

Step 2: Creating the Custom Login Page

To create the custom login page, you need to have a basic understanding of HTML, CSS, and JavaScript. Here are the steps:

  1. Create an HTML file that will serve as the login page. You can use your favorite text editor or an integrated development environment (IDE) to create the file.
  2. Add the required HTML markup for the login page, including form elements for username and password input fields.
  3. Use CSS to style the login page according to your application’s branding and design guidelines.
  4. Write JavaScript code to handle form submission and interact with the Azure B2C API.

Adding personal touches and commentary, I recommend using a modern CSS framework like Bootstrap or Tailwind CSS to make your login page responsive and visually appealing. These frameworks provide pre-built components and classes that can save you a lot of time and effort.

Step 3: Interacting with the Azure B2C API

Now that we have our custom login page ready, we need to write JavaScript code to handle form submission and interact with the Azure B2C API. Here are the key tasks:

  1. Attach an event listener to the form submission event.
  2. Prevent the default form submission behavior to handle the login process programmatically.
  3. Retrieve the values entered by the user in the username and password fields.
  4. Use the Azure B2C Authentication API to send a POST request to the Azure B2C endpoint with the user’s credentials.
  5. Handle the response from the Azure B2C API, which includes the authentication token.
  6. Perform any additional tasks, such as redirecting the user to a specific page or storing the token for future use.


Creating a custom login page using JavaScript in Azure B2C allows you to tailor the authentication experience to your specific needs. By following the steps outlined in this article, you can develop a login page that aligns with your application’s branding and provides a seamless user experience.

Remember to test your custom login page thoroughly to ensure it works as expected and provides a secure login process for your users. Additionally, keep in mind that any customization you make should comply with Azure B2C’s terms of use and privacy policies.

Now it’s time to get started with creating your own custom login page in Azure B2C. Good luck!