API Design · question
Question 4 of 110
What are the most important HTTP status codes for APIs?
← All API Design questions
Re-explain
2xx Success:
- 200 OK: Successful GET, PUT, PATCH
- 201 Created: Successful POST
- 204 No Content: Successful DELETE or PUT with no response body
4xx Client Error:
- 400 Bad Request: Invalid request syntax
- 401 Unauthorized: Authentication required
- 403 Forbidden: Access denied
- 404 Not Found: Resource doesn't exist
- 409 Conflict: Resource conflict
- 422 Unprocessable Entity: Validation errors
5xx Server Error:
- 500 Internal Server Error: Generic server error
- 503 Service Unavailable: Server temporarily unavailable
Rewriting in plainer words…
This answer doesn't lend itself to a diagram - it reads best . No credits were charged.
Why there's no diagram: “”
The diagram below the answer is the concept .
Jump to it ↓
What should the new diagram focus on?
Guided practice for API Design
One question at a time. Answer out loud, get graded, see what you missed.
How well did you know this?
AI:
Saved in this browser - sign in to keep your review list.
How should your speech become text?
Listening… your words appear above as you speak - tap Stop when you're done.
Recording · cr - tap Stop & transcribe when you're done.
Transcribing with AI…
Voice:
Keep going - a few more words and AI can grade it.
Interview lens
Likely follow-ups, what you can say, and the weak answers to avoid.
Pro · $10/mo
90 of 110 API Design answers are in Pro.
Full answers, code samples, and AI explanations that go simpler or deeper. Cancel anytime.
-
Full answers + code
-
AI explanations, simpler or deeper
-
1,000 AI credits / month
-
Cancel anytime
