JSON.stringify(new Error()) trả về một vật thể rỗng

> JSON.stringify(error);
'{}'

From the document of JSON.stringify(),

For all the other Object instances (including Map, Set, WeakMap and WeakSet), only their enumerable properties will be serialized.

and Error object doesn’t have any enumerable properties, that’s why it prints an empty object.

Background on enumerable properties

In Javascript, an object can have two types of properties:

• enumerable properties
• non-enumerable properties

The exact distinction is a bit tricky, but basically:

• “normal” properties, such as the ones you create by assignment ( myobj= {}; myobj.prop1 = 4711;), are enumerable,
• “internal” properties, such as the length property of an array, are non-enumerable

In particular, an Error has only non-enumerable properties.

For details, see for example Enumerability and ownership of properties on MDN.

Nguồn:: Stack Overflow, Is it not possible to stringify an Error using JSON.stringify?