Error codes

Code	Meaning
VALIDATION_ERROR	Query, path, or body did not match the schema
INVALID_API_KEY	API key is invalid or revoked
API_KEY_LIMIT_REACHED	Account already has the maximum number of active API keys
NOT_FOUND	Requested repository, watchlist, or resource was not found
RATE_LIMITED	Public API rate limit was exceeded
INTERNAL_SERVER_ERROR	Unexpected server-side error

Clients should use HTTP status codes for control flow and use error.code for diagnostics.