text: var PARSE_ERROR = -32700;
  var INVALID_REQUEST = -32600;
  var METHOD_NOT_FOUND = -32601;
  var INVALID_PARAMS = -32602;
  var INTERNAL_ERROR = -32603;
  
  var ERRORS = {
      "-32700": {
          message: "Parse error",
          text: "Invalid JSON was received by the server. An error occurred on the server while parsing the JSON text."
      },
      "-32600": {
          message: "Invalid Request",
          text: "The JSON sent is not a valid Request object."
      },
      "-32601": {
          message: "Method not found",
          text: "The method does not exist / is not available."
      },
      "-32602": {
          message: "Invalid params",
          text: "Invalid method parameter(s)."
      },
      "-32603": {
          message: "Internal error",
          text: "Internal JSON-RPC error."
      }
  };
  
  module.exports.InvalidParamsError = InvalidParamsError;
  module.exports.MethodNotFoundError = MethodNotFoundError;