Best Practices for API Design

🔧 7 API Design Best Practices

1. REST Fundamentals

   • Use clear resource-based endpoints (/items, /items/{id})

   • Stick to HTTP verbs: GET, POST, PUT, DELETE

   • Balance REST purity with real-world needs

2. Error Handling

   • Return meaningful status codes (e.g., 400, 500)

   • Include helpful error messages without exposing sensitive info

3. API Versioning

   • Use /v1/, /v2/ in URL paths

   • Avoid query params for versioning

   • Maintain backward compatibility

4. Rate Limiting

   • Prevent abuse with headers like X-RateLimit-Limit, X-RateLimit-Remaining

   • Prefer API key-based limits over IP-based

5. Pagination

   • Offset: simple but slow for large datasets

   • Cursor: efficient and consistent, ideal for dynamic data

6. Idempotency

   • Use UUID-based idempotency keys to prevent duplicate processing

   • Cache responses or use DB constraints/message queues

7. Filtering & Sorting

   • Enable query params like ?type=value and ?sort=field&order=asc

   • Index wisely to avoid performance hits

💡 Final Takeaway

Design APIs to be predictable, scalable, and resilient. Prioritize clarity, consistency, and performance — your future self and your users will thank you.