Secure API Design
Security Checklist
| Practice | Description |
|---|---|
| HTTPS only | Never expose over HTTP |
| Authentication | Require for all endpoints |
| Authorization | Check permissions |
| Input validation | Validate all inputs |
| Rate limiting | Prevent abuse |
| Error handling | Never expose internals |
| Logging | Audit all security events |
| Headers | Set security headers |
Key Points
- Understanding Secure API Design 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
API Best Practices
Design Principles
- Use nouns, not verbs
- Plural resource names
- Consistent naming conventions
- Proper HTTP status codes
Versioning
- URI versioning (/v1/resource)
- Header versioning
- Deprecation policy
Documentation
- OpenAPI/Swagger specs
- Request/Response examples
- Error code documentation
- Rate limit documentation
Key Points
- Understanding Secure API Design 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 Secure API Design in a backend system. Consider scalability, error handling, and production readiness.
Solution
// Secure API Design implementation
// Key aspects: validation, error handling, logging, testing
public class SecureAPIDesign {
// Production-ready implementation
}Identify and handle edge cases for Secure API Design. 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 Secure API Design. 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. Secure API first requirement?
2. Never expose in errors?
3. What is the primary purpose of Secure API Design?
4. What is a common mistake when implementing Secure API Design?
Flashcards
Question
Secure API first?
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Answer
HTTPS - foundation of all security
Question
Error response rule?
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Answer
Never expose internal details
Question
What is Secure API Design?
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Answer
Secure API Design is a key concept in backend development.
Question
When to use Secure API Design?
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Answer
Use Secure API Design when building production systems that require reliability, scalability, and maintainability.
Question
Secure API Design 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.HTTPS is mandatory
- 2.Authenticate and authorize all endpoints
- 3.Validate all inputs
- 4.Never expose internal errors
Interview Tips
- •Design secure APIs
- •Apply security checklist
Cheat Sheet
Secure API
- HTTPS: mandatory
- Auth: every endpoint
- Validate: all inputs
- Errors: no internal details
- Log: security events