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REST API Questions

REST API design and implementation questions.

1h
5 problems
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REST API Design

What Makes API RESTful?

  1. Client-Server
  2. Stateless
  3. Cacheable
  4. Uniform interface
  5. Layered system

PUT vs PATCH

Method Purpose Idempotent
PUT Replace entire resource Yes
PATCH Partial update No

Pagination

  • Offset: simple, degrades on deep pages
  • Cursor: consistent, no random access

Key Points

  • Understanding REST API 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

  1. Validation: Always validate input at the boundary
  2. Error Handling: Use structured error responses
  3. Logging: Log key events for debugging
  4. Testing: Unit, integration, and load tests
  5. Documentation: Keep docs updated with code changes

Error Handling

Status Codes

200 OK, 201 Created, 204 No Content
400 Bad Request, 401 Unauthorized, 403 Forbidden, 404 Not Found
409 Conflict, 422 Validation Error, 429 Rate Limited, 500 Server Error

Error Response

{
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid input",
    "details": [{"field": "email", "message": "Must be valid"}],
    "traceId": "abc-123"
  }
}

Key Points

  • Understanding REST API 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

  1. Validation: Always validate input at the boundary
  2. Error Handling: Use structured error responses
  3. Logging: Log key events for debugging
  4. Testing: Unit, integration, and load tests
  5. Documentation: Keep docs updated with code changes

Practice Problems

0/3solved
Implement REST API Questions

Design and implement a solution for REST API Questions in a backend system. Consider scalability, error handling, and production readiness.

Solution
// REST API Questions implementation
// Key aspects: validation, error handling, logging, testing

public class RESTAPIQuestions {
    // Production-ready implementation
}
REST API Questions Edge Cases

Identify and handle edge cases for REST API 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, idempotency
REST API Questions Testing Strategy

Write a testing strategy for REST API Questions. Include unit tests, integration tests, and performance tests.

Solution
// Test plan:
// - Unit: 80% coverage target
// - Integration: API contracts
// - Performance: latency, throughput
// - Chaos: failure injection

Quiz

1. Main difference between PUT and PATCH?

Question 1 options

2. Better pagination for real-time data?

Question 2 options

3. What is the primary purpose of REST API Questions?

Question 3 options

4. What is a common mistake when implementing REST API Questions?

Question 4 options

Flashcards

Question

PUT vs PATCH?

Click to reveal answer

Answer

PUT: full replace. PATCH: partial update

Question

Pagination for real-time?

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Answer

Cursor-based - consistent across requests

Question

What is REST API Questions?

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Answer

REST API Questions is a key concept in backend development.

Question

When to use REST API Questions?

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Answer

Use REST API Questions when building production systems that require reliability, scalability, and maintainability.

Question

REST API 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.REST = resources + methods + status codes
  • 2.PUT replaces, PATCH partially updates
  • 3.Cursor pagination for consistency
  • 4.Consistent error format with trace IDs

Interview Tips

  • •Design a complete API for a scenario
  • •Explain versioning strategy
  • •Discuss error handling approach

Cheat Sheet

REST API Interview

  • PUT: Replace. PATCH: Partial update
  • Pagination: Cursor (consistent) vs Offset (simple)
  • Versioning: URL path (/v1/) recommended
  • Errors: Status code + error code + message + traceId