Auth Design
Auth Method Selection
| Method | Use Case |
|---|---|
| API Key | Server-to-server |
| JWT | Stateless, distributed |
| OAuth 2.0 | Third-party access |
| Session | Browser-based |
Choosing the Right Method
Consider your architecture and trust boundaries. API keys work well for internal services but lack user context. JWTs carry claims and don't require server-side sessions, making them ideal for microservices. OAuth 2.0 delegates auth to an external provider, useful for social login or third-party integrations. Sessions are simple but require sticky sessions or shared storage. Always weigh security requirements against implementation complexity when selecting an auth strategy.
Best Practices
Security Best Practices
- Password Storage: Use bcrypt/scrypt with salt
- Token Management: Short-lived access tokens (15-30 min)
- HTTPS: Enforce TLS everywhere
- Rate Limiting: Prevent brute force attacks
- Input Validation: Never trust user input
Implementation Checklist
- Hash passwords with bcrypt (cost factor 12+)
- Implement token refresh flow
- Add CSRF protection
- Log authentication events
- Use secure session management
Key Points
- Understanding API Design: Authentication is essential for production systems
- Always consider scalability and maintainability
- Test thoroughly before deploying to production
- Monitor performance and set up alerting
Common Patterns
- Validation: Always validate input at the boundary
- Error Handling: Use structured error responses
- Logging: Log key events for debugging
- Testing: Unit, integration, and load tests
- Documentation: Keep docs updated with code changes
Practice Problems
Design and implement a solution for API Design: Authentication in a backend system. Consider scalability, error handling, and production readiness.
Solution
// API Design: Authentication implementation
// Key aspects: validation, error handling, logging, testing
public class APIDesignAuthentication {
// Production-ready implementation
}Identify and handle edge cases for API Design: Authentication. What happens under high load, with invalid input, or during failures?
Solution
// Edge case handling:
// 1. Null/empty input -> validation
// 2. High load -> rate limiting, queuing
// 3. Failures -> retries, circuit breaker
// 4. Concurrent access -> locks, idempotencyWrite a testing strategy for API Design: Authentication. Include unit tests, integration tests, and performance tests.
Solution
// Test plan:
// - Unit: 80% coverage target
// - Integration: API contracts
// - Performance: latency, throughput
// - Chaos: failure injectionQuiz
1. JWT best for?
2. API key is for?
3. What is the primary purpose of API Design: Authentication?
4. What is a common mistake when implementing API Design: Authentication?
Flashcards
Question
JWT best for?
Click to reveal answer
Answer
Stateless distributed APIs
Question
API key for?
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Answer
Server-to-server
Question
What is API Design: Authentication?
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Answer
API Design: Authentication is a key concept in backend development.
Question
When to use API Design: Authentication?
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Answer
Use API Design: Authentication when building production systems that require reliability, scalability, and maintainability.
Question
API Design: Authentication best practices
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Answer
Follow SOLID principles, write clean code, test thoroughly, document decisions, and monitor in production.
Revision Notes
Key Takeaways
- 1.Choose auth method based on use case
- 2.JWT for stateless APIs
- 3.API key for server-to-server
- 4.OAuth for third-party
Interview Tips
- •Design auth strategy
- •Choose appropriate method
Cheat Sheet
Auth Design
- JWT: stateless, distributed
- API Key: server-to-server
- OAuth: third-party
- Session: browser-based