keycloak-js is a JavaScript adapter for Keycloak, an open-source identity and access management solution. This library allows developers to easily integrate Keycloak authentication and authorization into their web applications. With keycloak-js, you can manage user sessions, handle login and logout processes, and secure your application by enforcing role-based access control. It provides a comprehensive set of features for single sign-on (SSO), user federation, and social login, making it a robust choice for applications that require secure user management.

One notable alternative to keycloak-js is auth0-js. This library is part of the Auth0 platform, which offers a cloud-based identity management solution. The auth0-js library allows developers to easily implement authentication and authorization in their applications using Auth0's services. It supports various authentication methods, including social logins, enterprise logins, and passwordless authentication. If you are looking for a managed service that simplifies user authentication and provides extensive features like analytics and user management, auth0-js is a strong contender.

To compare keycloak-js and auth0-js, check out the following link: Comparing auth0-js vs keycloak-js.