Adding Enterprise SSO to Next.js App Router Apps: The Complete Guide

The Verizon 2025 Data Breach Investigations Report highlights that over 60% of breaches involving web applications are due to compromised credentials, which enterprise Single Sign-On (SSO) can mitigate by using a trusted identity provider for authentication. For Next.js developers, particularly those closing enterprise deals, supporting SSO is crucial as it is a common requirement in security questionnaires during procurement. SSOJet offers a streamlined solution for integrating SSO in Next.js applications through its OIDC hosted page flow, which simplifies the process by handling identity provider selection, SAML assertion exchange, and error messaging. The Next.js App Router, stable since version 13, changes SSO integration by requiring SSO login initiation from a Server Action and callback handling from a Route Handler, with session-based route protection managed in middleware.ts. SSOJet's architecture allows developers to implement SSO without dealing with SAML XML or per-tenant protocol configurations, and it supports multi-tenant applications with minimal setup changes per customer. Additionally, SSOJet enforces security controls such as PKCE on OIDC flows and provides a flat-rate pricing model, making it an efficient choice for B2B applications.