Put error codes in a fixed key

Just want to suggest the developers to use best practices and put error code in a fixed key of the response. Currently the ltp api for example responds like this

{
  "status": "failed",
  "data": {
      "805": "Too many requests..."
  }
}

This is very difficult to handle. It should instead be like it is shown on Introduction page of the documentation (I can’t put links yet)

{
   "status": "failed",
   "data": {
      "errorCode": "805",
      "errorMessage": "Too many requests..."
   }
}