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Passport.js
Authentication middleware. Works, but Auth0 is less to maintain.
Passport.js handles authentication strategies — local, OAuth, JWT, SAML — through a pluggable middleware pattern. The strategy ecosystem covers every provider imaginable.
The maintenance burden is the issue. You're responsible for session management, token refresh, security patches, and strategy configuration. Auth0 handles all of this as a managed service. For applications that need custom authentication flows or can't use a third-party service, Passport.js is solid. For everything else, delegate authentication to a specialist.
authbackend