Securing Spring Boot Applications with OAuth2

Open Authorization 2.0 (OAuth 2.0) is an open standard protocol that provides secure authorization for web and mobile applications. It allows users to grant limited access to their resources on one website (called the “resource server”) to another website or application (called the “client”) without sharing their credentials, such as usernames and passwords. This means that the resource server will never see a user’s credentials. OAuth 2.0 is widely used for enabling single sign-on (SSO), accessing third-party APIs, and implementing secure authorization mechanisms. SSO allows a user to log in to any of several related, yet independent, applications with a single ID. Once logged in to an application, the user is not required to reenter the credentials to access the rest of the applications.

OpenID Connect (OIDC) is an open standard for user authentication that’s built on top of OAuth 2.0. It&...