SAML vs OAuth 2.0 vs OIDC: A Practical Deep Dive with Architecture & API Access Flows

May 14, 2025 · 4 min read · 🧠 Core Concepts ProtocolPurposeTypeFormatToken FormatIdeal Use Case SAMLAuthentication onlyFederated AuthenticationXML-basedSAML Assertion (XML)Web SSO OAuth 2.0Authorization onlyDelegated AuthorizationJSONAccess / Refresh TokensAPI Access ...