Authentication verifies user identity. The right strategy depends on your application type, security requirements, and infrastructure. Here's how to choose.
Session-Based Authentication#
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Session Pros/Cons#
Pros:
✓ Easy to invalidate (delete from store)
✓ Server controls session data
✓ Smaller cookie size
✓ Can store complex data
Cons:
✗ Requires server storage
✗ Scaling needs shared store (Redis)
✗ Stateful - harder to distribute
JWT Authentication#
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JWT Pros/Cons#
Pros:
✓ Stateless - no server storage
✓ Easy to scale horizontally
✓ Works across domains
✓ Contains user data
Cons:
✗ Can't easily invalidate
✗ Larger payload size
✗ Token theft risks
✗ Refresh token complexity
OAuth 2.0 / OpenID Connect#
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Comparison Table#
| Feature | Sessions | JWT | OAuth |
|------------------|----------|----------|----------|
| Stateless | No | Yes | Depends |
| Revocation | Easy | Hard | Medium |
| Scaling | Redis | Easy | Easy |
| Cross-domain | Hard | Easy | Easy |
| Implementation | Simple | Medium | Complex |
| Third-party auth | No | No | Yes |
Security Best Practices#
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When to Use What#
Use Sessions when:
- Traditional web app (server-rendered)
- Need easy session invalidation
- Single domain
- Can use Redis/Memcached
Use JWT when:
- API-first architecture
- Mobile apps
- Microservices
- Serverless functions
- Cross-domain requests
Use OAuth when:
- Third-party login (Google, GitHub)
- API access delegation
- Enterprise SSO integration
Conclusion#
There's no universally "best" authentication method. Sessions work great for traditional web apps, JWTs suit APIs and mobile apps, and OAuth enables third-party authentication.
Often the best approach combines methods—OAuth for social login, JWT for API access, with proper security measures throughout.