Auth0 Universal Login Context Inspector

Developer panel for inspecting and previewing the Universal Login JSON context (window.universal_login_context) for the Advanced Customizations for Universal Login (ACUL) feature.

✅ What It Does

1. Detects if a real tenant context exists ("connected" mode).
2. If not, lets you preview screens & variants using a local or CDN manifest ("disconnected" mode).
3. Lets you inspect & live-edit mock context JSON (broadcasts a custom event).
4. Persists your selections (screen / variant / data source / version) in sessionStorage between reloads.

📦 1. Install

npm install @auth0/ul-context-inspector

Peer dependencies (install if you don’t already have them):

npm install react react-dom

🗂 2. Local Manifest & Variant Files

When the panel runs in disconnected mode it attempts to fetch a local manifest at GET /manifest.json:

• If the request succeeds (HTTP 200), the data source switches to "Local development" automatically.
• If it fails, the panel defaults to the Auth0 CDN manifest.

Place your manifest and variant JSON under public/ so Vite (or your bundler) serves them from the root:

public/
  manifest.json
  screens/
    login/
      login/
        default.json
        with-errors.json
    login-id/
      login-id/
        default.json
        with-errors.json

Manifest Shape

manifest.json contains an array screens with objects mapping prompt → screen → variant node:

{
  "screens": [
    {
      "login": {
        "login": { "path": "/screens/login/login", "variants": ["default", "with-errors"] }
      }
    },
    {
      "login-id": {
        "login-id": { "path": "/screens/login-id/login-id", "variants": ["default", "with-errors"] }
      }
    }
  ]
}

Each variant file is loaded at: <path>/<variant>.json (e.g. /screens/login/login/default.json).

If a node omits variants, the panel assumes a single default variant.

🧪 3. Mount the Panel

import { UniversalLoginContextPanel } from '@auth0/ul-context-inspector';

export function App() {
  return <UniversalLoginContextPanel defaultScreen="login:login" />;
}

defaultScreen uses prompt:screen format. If omitted and CDN mode is active, the panel may auto-select a common screen (e.g. login-id:login-id).

� 4. Subscribe to Context Updates (Optional)

Use the subscription hook if your host needs to re-render on context changes:

import { useUniversalLoginContextSubscription } from '@auth0/ul-context-inspector';

function Host() {
  const context = useUniversalLoginContextSubscription();
  return <pre>{JSON.stringify(context?.screen, null, 2)}</pre>;
}

�🕹 5. Interactive Behavior

• Connected mode: If window.universal_login_context existed at mount, selections do not override real tenant context screen/variant.
• Disconnected mode: Screen & variant selection reloads the page to simulate host SDK remount.
• Persistence: Values stored in sessionStorage with prefix ulci:.
• Local manifest auto-detection runs once at startup; if found, data source switches to Local.
• Editing JSON: Writes directly to window.universal_login_context (even in mock mode) and triggers a broadcast event.

🧩 Panel Props

🎨 Styling Notes

Tailwind classes are prefixed with uci-. If you purge CSS, safelist with a regex like /uci-/.

🛠 Development

npm install
npm run dev      # Start dev server
npm run build    # Produce dist (JS, types, CSS)

🧾 License

Apache-2.0

❓ FAQ

Why is my local manifest ignored?
Ensure public/manifest.json returns 200 and matches the shape above; check dev tools Network panel.

How do I force CDN mode?
Delete/rename local manifest.json or manually switch data source in the panel.