Enterprise SSO in FastAPI: How to Add SAML and OIDC Auth to Python APIs in 2026

The Verizon 2025 Data Breach Investigations Report highlights that 81% of hacking-related breaches involve compromised or weak credentials, posing a significant challenge for Python API teams using FastAPI to build B2B SaaS solutions. Enterprise procurement teams often demand Single Sign-On (SSO) as a prerequisite before signing contracts, but Python's support for enterprise SSO is less robust compared to other languages, making it difficult for developers. SSOJet offers a solution with its OIDC hosted page flow, which allows FastAPI applications to redirect users to an SSOJet authorization page, enabling authentication via the user's identity provider without requiring SAML code. This approach streamlines the integration of enterprise SSO by handling all complex SAML interactions and returning an OIDC authorization code to FastAPI, facilitating a seamless and secure authentication experience. The use of SSOJet simplifies the process by eliminating the need for developers to manage XML configurations or SAML libraries, thus making it an attractive option for FastAPI teams focused on delivering scalable and secure B2B SaaS applications.