How to implement Azure AD B2C login in a React Native app for both web and mobile

Question

I need to add a login feature to my React Native app that will authenticate via Azure AD B2C. The login screen will have an email text field with a login button. Once the user enters their email address and clicks the login button, they will be redirected to a Microsoft login page within the app. The user will enter their password and click the submit button. After successful authentication, the user will be redirected to the app's home page.

This feature should work with the same code on both web and mobile platforms.

Thank you.

Answer 1

I Hope you have Azure AD B2C tenant. Register your application in Azure AD B2C and configure the necessary authentication settings.

Implement the authentication flow in your React Native app using the Azure AD B2C endpoints. This typically involves.

1. initiating the authentication process,
2. handling redirects/callbacks,
3. exchanging authorization code for tokens, and
4. storing tokens securely.

For web, you may use libraries like react-azure-adb2c or msal.js for handling authentication. For mobile, you'll likely use a library like react-native-app-auth to handle authentication.

Here's a basic example of how you might configure authentication using react-native-app-auth in your React Native app..

If the answer is helpful, please click "Accept Answer" and upvote it.

Best Regards,

Debajyoti

import { authorize } from 'react-native-app-auth';

const config = {
  issuer: 'https://yourtenant.b2clogin.com/yourtenant.onmicrosoft.com/v2.0/',
  clientId: 'your-client-id',
  redirectUrl: 'your-redirect-url',
  scopes: ['openid', 'profile', 'email'],
  additionalParameters: {
    prompt: 'login',
  },
};

const signIn = async () => {
  try {
    const result = await authorize(config);
    console.log('DD App Authorization result:', result);
    // Handle authentication success
  } catch (error) {
    console.error('Authorization error:', error);
    // Handle authentication failure
  }
};