Passport.js
Authentication middleware for Node.js with a strategy plugin system supporting 500+ authentication strategies (Local, OAuth, Google, GitHub, Facebook, SAML, etc.). Passport handles authentication flow, session management, and user serialization/deserialization. Works with Express and Connect-based frameworks. The standard authentication library in the Node.js ecosystem.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
OAuth client secrets must be kept server-side. Session fixation attacks require session regeneration on login (req.session.regenerate()). CSRF protection needed for form-based login strategies.
⚡ Reliability
Best When
You're building Express.js applications that need multiple auth strategies (local + social OAuth) with session management.
Avoid When
You want managed OAuth without callback URL management — use Auth0, Clerk, or NextAuth.js instead.
Use Cases
- • Add OAuth/OIDC social login (Google, GitHub, Facebook) to Express applications using strategy plugins
- • Implement local username/password authentication with bcrypt verification via passport-local strategy
- • Build API authentication with JWT bearer tokens using passport-jwt strategy
- • Handle SAML SSO for enterprise identity providers (Okta, Azure AD) via passport-saml
- • Manage user sessions across requests with Passport's req.user, login(), and logout() methods
Not For
- • Fastify, Hapi, or non-Express frameworks — Passport is designed for Express; use framework-native auth for others
- • Modern authentication-as-a-service — Auth0, Clerk, or NextAuth.js handle OAuth flows with less configuration
- • Stateless JWT-only APIs where sessions aren't needed — jsonwebtoken middleware is simpler without Passport overhead
Interface
Authentication
Passport is the auth middleware itself. OAuth strategy configurations require client IDs and secrets from identity providers.
Pricing
Free and open source.
Agent Metadata
Known Gotchas
- ⚠ Passport requires express-session middleware initialized BEFORE passport.initialize() and passport.session() — wrong middleware order causes 'Failed to serialize user into session' errors
- ⚠ req.isAuthenticated() returns false for all requests if passport.session() is not used — agents must distinguish stateless (JWT) vs stateful (session) Passport configurations
- ⚠ passport.authenticate() can call done(null, false) to reject auth (not an error) — strategy verify callbacks must use done(null, user) for success and done(null, false) for failure, not errors
- ⚠ serializeUser/deserializeUser callbacks are required for session-based auth — forgetting them causes session to not persist the user between requests
- ⚠ OAuth strategies require exact redirect URI matching — even trailing slash differences between registered and actual callback URLs cause OAuth errors
- ⚠ Passport 0.6.x introduced breaking changes to session handling — strategies written for 0.5.x may not work correctly; verify strategy package compatibility
Alternatives
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Scores are editorial opinions as of 2026-03-07.