KittyCAD uses conventional HTTP response codes to indicate the success or failure of an API request. In general: Codes in the 2xx range indicate success. Codes in the 4xx range indicate an error that failed given the information provided (e.g., a required parameter was omitted, etc.). Codes in the 5xx range indicate an error with KittyCAD's servers (these are rare).

HTTP Status Code Summary
400 - Bad RequestThe request failed could not authenticate, but the token existed.
401 - UnauthorizedNo valid API key provided.
403 - ForbiddenThe API key doesn't have permissions to perform the request.
404 - Not FoundThe requested resource doesn't exist.
406 - Not AcceptableThe request was unacceptable, often due to missing a required parameter.
500 - Internal Server ErrorThe server encountered an unexpected condition that prevented it from fulfilling the request.