OAuth vs SAML: 6 Key Differences Explained

OAuth and SAML, often mistakenly compared as alternatives, actually serve different functions within identity architecture, with OAuth being an authorization framework and SAML an authentication protocol. The article clarifies the distinction, emphasizing that OAuth facilitates delegated access to resources without sharing user credentials, while SAML provides federated authentication for enterprise Single Sign-On (SSO). OpenID Connect (OIDC) is highlighted as an essential extension of OAuth that introduces an authentication layer, making it suitable for modern applications, and is frequently compared with SAML rather than OAuth alone. The guide explores their key differences, including token formats, primary use cases, implementation complexities, and support for modern app architectures. It underscores the importance of understanding when to employ SAML for enterprise SSO needs and OAuth/OIDC for API access and consumer-facing applications. Furthermore, it explains that the two protocols can coexist in a hybrid identity stack, each handling different aspects of authentication and authorization, as illustrated by real-world examples such as Microsoft's ecosystem.