Azure AD SSO for Express.js Apps: Step-by-Step Guide

The guide outlines how to implement Azure AD Single Sign-On (SSO) for Express.js applications using Microsoft Entra ID, formerly Azure Active Directory, by leveraging a broker like SSOJet. This approach involves using OpenID Connect (OIDC) for authentication instead of directly handling SAML assertions and certificate rotations, which can be complex and cumbersome when managing multiple enterprise connections. By routing authentication through a broker, the Express.js app only needs to speak OIDC to a single endpoint, while the broker manages the translation to each customer's Entra ID tenant. The document details the process of setting up the OIDC flow in Express.js, including building the /login and /callback routes with state and nonce for security, using Passport for session management, and ensuring secure session cookies. It emphasizes the operational benefits of using a broker for scalability and ease of maintenance, allowing rapid onboarding of new enterprise customers while reducing the engineering overhead associated with SAML configurations and certificate management.

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