Each environment has distinct popular libraries for implementing authentication. Node.js commonly uses Passport.js, which supports many strategies such as OAuth, JWT, and local authentication. Python frameworks like Django come with a built-in authentication system, while Flask relies on extensions like Flask-Login or Flask-Security. Java developers often use Spring Security, which integrates tightly with the Java ecosystem and supports sophisticated security policies including single sign-on and multi-factor authentication. The choice of library significantly impacts ease of implementation and security features.
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