试试看：

var obj = {
    a: "foo",
    b: obj
};

var circular_replacer = (value) => {
    var seen = [];
    if (value != null && typeof value == "object") {
        if (seen.indexOf(value) >= 0) return;
        seen.push(value);
    }
    return value;
};

obj = circular_replacer(obj);

使用带有自定义替换符的JSON.stringify。例如：

// Demo: Circular reference
var circ = {};
circ.circ = circ;

// Note: cache should not be re-used by repeated calls to JSON.stringify.
var cache = [];
JSON.stringify(circ, (key, value) => {
  if (typeof value === 'object' && value !== null) {
    // Duplicate reference found, discard key
    if (cache.includes(value)) return;

    // Store value in our collection
    cache.push(value);
  }
  return value;
});
cache = null; // Enable garbage collection

本例中的替换符并非100%正确（取决于您对“重复”的定义）。在以下情况下，将丢弃一个值：

var a = {b:1}
var o = {};
o.one = a;
o.two = a;
// one and two point to the same object, but two is discarded:
JSON.stringify(o, ...);

但概念是：使用自定义替换器，并跟踪解析的对象值。

作为es6中编写的实用函数：

// safely handles circular references
JSON.safeStringify = (obj, indent = 2) => {
  let cache = [];
  const retVal = JSON.stringify(
    obj,
    (key, value) =>
      typeof value === "object" && value !== null
        ? cache.includes(value)
          ? undefined // Duplicate reference found, discard key
          : cache.push(value) && value // Store value in our collection
        : value,
    indent
  );
  cache = null;
  return retVal;
};

// Example:
console.log('options', JSON.safeStringify(options))

我为LoggingUtilities类创建了以下方法。以下方法获取源和目标对象，并通过给定的maxLevel将源分配给目标。

  static assignObjectByLevel(
    sourceObject: any,
    targetObject: any,
    currentLevel: number = 0,
    maxLevel: number = 3,
    showUndefinedValues = false
  ): any {
    if (currentLevel >= maxLevel) {
      return;
    }

    const objQueue = [];
    for (const key in sourceObject) {
      if (sourceObject.hasOwnProperty(key)) {
        const value = sourceObject[key];
        if (typeof value === "object") {
          objQueue.push({ key, value });
        } else {
          targetObject[key] = value;
        }
      } else {
        if (showUndefinedValues) {
          targetObject[key] = "undefined/null";
        }
      }
    }

    while (objQueue.length > 0) {
      const objVal = objQueue.pop();
      currentLevel++;
      targetObject[objVal.key] = {};
      this.assignObjectByLevel(
        objVal.value,
        targetObject[objVal.key],
        currentLevel,
        maxLevel,
        false
      );
    }
  }

用法示例：

   const logObjParam = {
      level1: "value1",
      level2: {
        value2: "value2",
        level3: {
          value3: "value3",
          level4: {
            value4: " value4",
            level5: {
              value5: " value5",
            },
          },
        },
      },
    };

 let logObj = {};
 this.assignObjectByLevel(logObjParam, logObj);

结果：

{
  "level1": "value1",
  "level2": {
    "value2": "value2",
    "level3": {
      "value3": "value3",
      "level4": {}
    }
  }
}

您可以尝试JSON解析器库：treedoc。它支持循环引用，并使用引用消除重复对象。

纱线添加树文档

import {TD} from 'treedoc'
TD.stringify(obj);

如果您需要更多定制

import {TD, TDEncodeOption} from 'treedoc'

const opt = new TDEncodeOption();
opt.coderOption.setShowType(true).setShowFunction(true);
opt.jsonOption.setIndentFactor(2);
return TD.stringify(obj, opt);

查看器可以查看生成的JSON文件http://treedoc.org，支持通过JSON节点引用进行导航。

我是这个图书馆的作者

superserial完全序列化JavaScript对象。

https://github.com/denostack/superserial

用法：

const serializer = new Serializer();

const nodes = [{ self: null as any, siblings: [] as any[] }, {
  self: null as any,
  siblings: [] as any[],
}];
nodes[0].self = nodes[0];
nodes[0].siblings = nodes;
nodes[1].self = nodes[1];
nodes[1].siblings = nodes;

const serialized = serializer.serialize(nodes);

console.log(serialized);

输出：

[$1,$2];{"self":$1,"siblings":$0};{"self":$2,"siblings":$0}

循环引用时，此代码将失败：

    JSON.stringify(circularReference);
// TypeError: cyclic object value

使用以下代码：

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

JSON.stringify(circularReference, getCircularReplacer());