All responses from the Tractorbeam API use JSON and follow the JSend specification.

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Success Response

Everything is great, and the resource you created/requested is returned. The HTTP code returned with this response will always be a 200. 
{
  "status": "success",
  "data": {
    "id": "123",
    "name": "Example"
  }
}

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Failure Response

You did something wrong, and your request could not be processed. For example, a required field was missing or the resource you were trying to create already exists. The response body will contain a list of specific errors or a general error message. The HTTP code returned with this response will always be a 3XX or 4XX. 
{
  "status": "fail",
  "data": {
    "field": "Error message"
  }
}

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Error Response

We did something wrong, and your request could not be processed. The response body may contain a general error message. The HTTP code returned with this response will always be a 500. 
{
  "status": "error",
  "message": "Error description"
}