API Design Questions
URL Shortener API
POST /api/shorten { longUrl } -> { shortUrl }
GET /{shortCode} -> Redirect
DELETE /api/shorten/{shortCode}
Design: Base62 encoding, collision handling, TTL, analytics.
Notification API
POST /api/notifications { userId, type, message, channel }
GET /api/notifications?userId=123
PUT /api/notifications/{id}/read
Design: Multiple channels, templates, rate limiting, delivery tracking.
Rate Limiter
Middleware: identify client -> check limit -> allow/reject
Headers: X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset
API Design Patterns
Idempotency
Idempotency-Key header: store response, return cached on duplicate.
Bulk Operations
POST /api/users/batch { operations: [...] }
Response includes per-operation status.
Long-Running Operations
POST /api/reports/generate -> { jobId, status: "processing" }
GET /api/jobs/{id} -> { status, downloadUrl }
Webhook Pattern
POST /api/webhooks { url, events }
Event occurs -> POST to webhook with payload
X-Webhook-Signature for verification
Key Points
- Understanding API Design Questions 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 Questions in a backend system. Consider scalability, error handling, and production readiness.
Solution
// API Design Questions implementation
// Key aspects: validation, error handling, logging, testing
public class APIDesignQuestions {
// Production-ready implementation
}Identify and handle edge cases for API Design Questions. 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 Questions. 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. API versioning best approach?
2. Header for duplicate prevention?
3. What is the primary purpose of API Design Questions?
4. What is a common mistake when implementing API Design Questions?
Flashcards
Question
Version APIs?
Click to reveal answer
Answer
URL path (/v1/) is most common
Question
Idempotency?
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Answer
Same request produces same result, prevents duplicates
Question
What is API Design Questions?
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Answer
API Design Questions is a key concept in backend development.
Question
When to use API Design Questions?
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Answer
Use API Design Questions when building production systems that require reliability, scalability, and maintainability.
Question
API Design Questions 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.Clear resource naming and HTTP methods
- 2.Cursor-based pagination for lists
- 3.Idempotency for critical operations
- 4.Bulk and async patterns for heavy ops
Interview Tips
- •Start with resources and endpoints
- •Explain versioning strategy upfront
- •Handle errors, pagination, bulk operations
Cheat Sheet
API Design Interview
- Resources: Nouns (/users, /orders)
- Pagination: Cursor-based preferred
- Idempotency: Key header for critical ops
- Versioning: URL path (/v1/)
- Bulk: POST with operations array