Error responses are always JSON-encoded, regardless of the request’s Content-Type, with a corresponding Content-Type: application/json header. This ensures that the errors are human-readable in any setting.

Errors are a JSON object with the keys:

  • code: One of the error codes as a string.
  • msg: A human-readable message describing the error as a string.
  • meta: (optional) An object with string values holding arbitrary additional metadata describing the error.

Example:

{
  "code": "internal",
  "msg": "Something went wrong"
}

Example with metadata:

{
  "code": "permission_denied",
  "msg": "Thou shall not pass",
  "meta": {
    "target": "Balrog",
    "power": "999"
  }
}
Error CodeHTTP StatusDescription
canceled408The operation was canceled, typically by the client.
unknown500An unknown error occurred, often used for unclassified or unexpected errors.
invalid_argument400The client specified an invalid argument, indicating an error like a malformed file name or a number out of range.
malformed400The client sent a malformed message, which could not be decoded due to improper encoding or incompatible message definitions.
deadline_exceeded408The operation expired before completion. This may occur even if the operation has technically completed successfully, but the response was delayed.
not_found404The requested entity was not found.
bad_route404The requested URL path is not routable to a Celestra service and method.
already_exists409An attempt to create an entity failed because it already exists.
permission_denied403The caller lacks permission for the operation. Not to be used when the caller’s identity is unknown.
unauthenticated401The request lacks valid authentication credentials for the operation.
resource_exhausted429A resource has been exhausted or rate-limited, such as a per-user quota.
failed_precondition412The operation was rejected due to the system not being in a required state.
aborted409The operation was aborted due to concurrency issues like transaction aborts or sequencer check failures.
out_of_range400The operation was attempted outside the valid range, like reading past the end of a collection.
unimplemented501The operation is not implemented or not supported/enabled in this service.
internal500Internal server error when invariants expected by the system were broken.
unavailable503The service is currently unavailable, usually a transient condition.
dataloss500The operation resulted in unrecoverable data loss or corruption.

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