REST API design best practices. Use when designing APIs, choosing status codes, or creating endpoints.
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/users not /getUsers — HTTP method is the verb/users, /orders — consistent collections/user-profiles not /user_profiles/users/{id}/orders — deeper use query params| Method | Purpose | Idempotent |
|---|---|---|
| GET | Retrieve | Yes |
| POST | Create | No |
| PUT | Replace entire resource | Yes |
| PATCH | Partial update | No |
| DELETE | Remove | Yes |
| Code | Use When |
|---|---|
| 200 | Success with body |
| 201 | Resource created (+ Location header) |
| 204 | Success, no body (DELETE) |
| 400 | Malformed request |
| 401 | Not authenticated |
| 403 | Authenticated but forbidden |
| 404 | Not found |
| 409 | Conflict (duplicate) |
| 422 | Valid syntax, invalid semantics |
| 429 | Rate limited |
{"error": {"code": "VALIDATION_ERROR", "message": "...", "details": [], "request_id": "req_..."}}
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