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Showing content from https://developer.mozilla.org/es/docs/Web/JavaScript/Reference/Global_Objects/Error/toString below:

Error.prototype.toString() - JavaScript | MDN

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El método toString() devuelve una cadena que representa el objeto Error especificado.

Una cadena que representa el objeto Error especificado.

El objeto Error redefine el método Object.prototype.toString() heredado por todos los objetos. Su semántica es la siguiente (asumiendo que Object y String tienen sus valores originales):

Error.prototype.toString = function () {
  "use strict";

  var obj = Object(this);
  if (obj !== this) {
    throw new TypeError();
  }

  var name = this.name;
  name = name === undefined ? "Error" : String(name);

  var msg = this.message;
  msg = msg === undefined ? "" : String(msg);

  if (name === "") {
    return msg;
  }
  if (msg === "") {
    return name;
  }

  return name + ": " + msg;
};

var e = new Error("fatal error");
console.log(e.toString()); // 'Error: error fatal'

e.name = undefined;
console.log(e.toString()); // 'Error: error fatal'

e.name = "";
console.log(e.toString()); // 'error fatal'

e.message = undefined;
console.log(e.toString()); // ''

e.name = "hola";
console.log(e.toString()); // 'hola'

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