// Client error
422 Unprocessable Content
The server understands the content type and syntax, but cannot process the instructions because the submitted values fail semantic or domain validation.
Common causes
- A field violates a business rule.
- Values conflict with current resource state.
- A required domain value is absent after parsing.
- A referenced object is not eligible for the action.
Troubleshooting
- Inspect field-level validation details.
- Compare enum, range and format constraints with the contract.
- Do not resend the same payload without a change.
- Keep the error body stable enough for clients to map fields.
Example response
HTTP/1.1 422 Unprocessable Content
Content-Type: application/json
{ "code": "validation_failed", "fields": { "amount": "Must be positive" } }Related status codes
// GET STARTED
Inspect the complete API response.
Use REST Test to send a request and review its status, headers, timing and body together.