- Auth0.js v9 switches to the latest embedded login API and removes the `usernamepassword/login` and `user/ssodata` endpoints.
- The new version no longer supports centralized (Hosted Login Page) flows and relies on Cross Origin Authentication combined with `WebAuth.checkSession` using Web Origins response mode.
- Developers must enable Web Origins for the new authentication flow; see migration docs for details.
SDKs - auth0.js
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Introduces early‑access Custom Rate Limits allowing per‑client or group throttling of Authentication API requests via API‑based self‑service configuration.
Introduces GA Flexible Password Policy replacing legacy settings with a unified `options.password_options` object for granular controls (composition, history, dictionary, profile data).
Custom signup/login fields and consent checkboxes now also apply to Social and Enterprise connections.