OpenID Connect vs OAuth2: The Differences and How to Choose

Authentication and authorization are fundamental components of modern software, and understanding the standards that govern them, particularly OAuth 2.0 and OpenID Connect, is crucial for developers. OAuth 2.0 is an authorization framework that enables third-party access to user information without sharing credentials, using tokens to grant limited data access. In contrast, OpenID Connect builds on OAuth 2.0 by adding an identity layer that facilitates user authentication, allowing applications to verify user identities without managing passwords. While OAuth 2.0 focuses on what actions can be performed by a user, OpenID Connect establishes who the user is. Choosing between them depends on the application’s requirements: OAuth 2.0 is suitable for managing resource access, whereas OpenID Connect is essential for authenticating user identities. Integrating both can enhance security and user experience, particularly for applications requiring Single Sign-On (SSO) capabilities.

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