Disclaimer: The views expressed in this post are my own and do not reflect those of Okta or its affiliates.

What We're Trying to Achieve?

In many enterprise environments - especially SMBs using digital portals, customers ask for a streamlined login experience:

• User clicks “Log In” in your App.
• They are immediately redirected to their company’s IdP (e.g. Azure AD, Okta).
• They do not want to see an Auth0-branded login page.
• After authentication, they return to your application seamlessly.

In this flow, Auth0 acts purely as a broker between your application and the enterprise IdP. It handles OAuth 2.0/OIDC mechanics security, PKCE, state, tokens-while allowing you to maintain full control over the user experience and comply with enterprise firewall requirements.

The Role of authorizationParams

Using the @auth0/auth0-react SDK, I've passed key parameters directly to Auth0’s /authorize endpoint through authorizationParams:

loginWithRedirect({
  authorizationParams: {
    connection: 'your-connection-name',
    redirect_uri: 'https://yourapp.com/callback'
  }
});

connection specifies the enterprise IdP to use, skipping Auth0's Universal Login entirely.

redirect_uri defines where Auth0 sends users after successful login.

The SDK automatically includes essential OAuth parameters (client_id, state, PKCE, etc.).

This yields a one-click, one-redirect flow, matching user expectations in a polished enterprise portal.

But then what's the point of Auth0 here?

Auth0 simplifies authentication without compromising enterprise standards:

• Identity broker: Supports OIDC, SAML and multiple IdPs with minimal configuration.
• Secure token handling: Issues ID tokens and refresh tokens securely, following best practices.
• Controlled redirects: Enforces redirect_uri whitelist—critical for firewall compliance.
• Scalable and flexible: Handling multiple enterprise IdPs requires only updating the connection parameter.
• Minimal build effort: No need to build or manage login UIs, PKCE, session handling, or protocol compliance.

As a Solutions Engineer, I've worked with multiple SMBs requiring:

• White‑label branding: Users should see only the company portal and their corporate IdP—not Auth0 branding.
• Firewall whitelisting: Login URLs must be static and predictable.
• Multiple enterprise clients: They may serve partners using Azure AD, Okta, Ping, etc.

This pattern delivers a seamless, compliant, branded experience with minimal overhead.

Here's a sample react code that i wrote using the auth0-react sdk for a short demo i created -

// App.js
import React from 'react';
import { useAuth0 } from '@auth0/auth0-react';

function App() {
  const { loginWithRedirect, isAuthenticated, user, logout } = useAuth0();

  const loginToIdP = () => {
    loginWithRedirect({
      authorizationParams: {
        connection: 'your-connection-name'
      }
    });
  };

  return (
    <div style={styles.container}>
      {!isAuthenticated ? (
        <div style={styles.loginBox}>
          <img src="/logo.png" alt="Company Logo" style={styles.logo} />
          <h1 style={styles.heading}>Welcome to Evolve</h1>
          <p style={styles.description}>
            Log in using your company’s single sign-on.
          </p>
          <button style={styles.loginButton} onClick={loginToIdP}>
            Log in
          </button>
        </div>
      ) : (
        <div style={styles.sessionBox}>
          <h3>Welcome, {user.name}</h3>
          <button onClick={() => logout({ logoutParams: { returnTo: window.location.origin } })}>
            Log Out
          </button>
        </div>
      )}
    </div>
  );
}

// ... styles omitted for brevity

export default App;

And this is the index.js - It Defines key OAuth parameters: redirect_uri for where users return after login
client_id, token settings, and PKCE flows are handled under the hood by the SDK

// index.js
import React from 'react';
import { createRoot } from 'react-dom/client';
import { Auth0Provider } from '@auth0/auth0-react';
import App from './App';

const domain = "your-auth0-app-domain-name";
const clientId = "your-auth0-app-client-id";

createRoot(document.getElementById('root')).render(
  <Auth0Provider
  domain={domain}
  clientId={clientId}
  authorizationParams={{
    connection: 'your-connection-name',
    response_type: 'code',
    redirect_uri: 'http://localhost:3000/callback',
  }}
>

    <App />
  </Auth0Provider>
);

One button triggers direct login via Azure AD. From the user's perspective, it’s a single click experience. Auth0 manages the entire auth protocol quietly in the background.

What’s Configured in the Auth0 Tenant?

In the Auth0 dashboard, you’ll set up:

Application with:

• Allowed Callback URL matching https://yourapp.com/callback
• Enterprise connection
• Optional custom domain for full branding (auth.yourcompany.com)

By combining Auth0’s enterprise-grade broker capabilities with a simple authorizationParams configuration, you get:

• A frictionless, branded login experience.
• Full enterprise security and compliance.
• Scalable support for multiple IdPs—all with minimal development effort.
• This pattern is ideal for partner portals, retailer dashboards, and B2B apps needing polished user experiences with enterprise authentication standards.

Watch this video to get a demo!