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The Devise gem is an authentication solution for Ruby on Rails applications; it helps you set up production-ready user authentication in your projects without having to do everything on your own.

Adding Authentication with Devise and set up Devise, including generating a Devise User model class (as depicted in Figure 5) along with the sign-up and sign-in pages. Create the sign-in/sign-out/sign-up hyperlinks. Restrict access to controller actions to only users who are signed in.

Devise is the cornerstone gem for Ruby on Rails authentication. With Devise, creating a User that can log in and out of your application is so simple because Devise takes care of all the controllers necessary for user creation ( users_controller ) and for user sessions ( users_sessions_controller ).

Introducing Devise for Ruby Warden handles user sessions using secure session strings to verify the identities of logged-in users. It also handles users who are not logged in to ensure they cannot access restricted resources.

I initially wondered whether devise, which is designed to use in full-stack Rails apps, is a good choice for API-only mode, but with a few small tweaks, it works and does the job. devise-jwt, a gem, is an extension to devise which handles the use of JWT s for user authentication.

Devise is the cornerstone gem for Ruby on Rails authentication. With Devise, creating a User that can log in and out of your application is so simple because Devise takes care of all the controllers necessary for user creation ( users_controller ) and for user sessions ( users_sessions_controller ).

If the authentication details are valid, Warden will store the user in a Warden::Proxy object stored as a request environment variable at request. env['warden'] . Later, this object is used by Devise to know the status of the authentication.