"Converting circular structure to JSON\n --> starting at object with constructor 'Socket'\n | property 'parser' -> object with constructor 'HTTPParser'\n --- property 'socket' closes the circle

这个错误通常是因为 JSON.stringify() 方法无法序列化循环引用的对象导致的。循环引用是指对象之间存在相互引用的情况。在这种情况下，当 JSON.stringify() 方法试图将对象转换为 JSON 字符串时，它会陷入无限循环，最终导致栈溢出错误。

要解决这个问题，你可以使用第三方库，如circular-json来序列化循环引用的对象。这个库可以检测循环引用并将其转换为特殊的标记，以便在序列化时正确处理它们。

另外，你也可以手动遍历对象并删除循环引用的属性，然后再使用JSON.stringify()方法将其转换为JSON字符串。

相关问题

socket.io-client Converting circular structure to JSON --> starting at object with constructor

The error "Converting circular structure to JSON" occurs when you are trying to stringify an object that contains circular references, meaning there is a loop in the object's structure. JSON does not support circular references, so when you try to convert such an object to JSON, you will encounter this error.

To resolve this issue, you need to identify and break the circular reference in your object before converting it to JSON. One approach is to remove or replace the circular reference with a placeholder value or an identifier that can be restored later.

In the case of `socket.io-client`, the circular reference error can occur if you are trying to emit or send an object that contains circular references through a socket. You can use the `JSON.stringify` method with a replacer function to handle circular references:

const circularReplacer = () => {
  const seen = new WeakSet();
  return (key, value) => {
    if (typeof value === "object" && value !== null) {
      if (seen.has(value)) {
        return;
      }
      seen.add(value);
    }
    return value;
  };
};

const jsonString = JSON.stringify(yourObject, circularReplacer());

This replacer function uses a `WeakSet` to keep track of visited objects and ignores circular references by returning undefined for them.

Make sure to apply this replacer function to your object before sending it through `socket.io-client`.

Converting circular structure to JSON --> starting at object with constructor 'Object'

"Converting circular structure to JSON"错误通常发生在尝试将包含循环引用的对象转换为JSON字符串时。循环引用是指对象之间存在相互引用的情况，导致无限递归。JSON序列化器无法处理这种循环引用，因此会抛出该错误。

解决此问题的一种方法是在序列化之前删除循环引用。可以使用第三方库`circular-json`来处理循环引用。以下是一个示例代码：

const CircularJSON = require('circular-json');

const obj = {};
obj.circularRef = obj;

const jsonString = CircularJSON.stringify(obj);
console.log(jsonString);

在上面的示例中，我们使用`circular-json`库将包含循环引用的对象转换为JSON字符串。通过将循环引用删除，我们可以成功地将对象转换为JSON字符串。