根据zainengineer的回答…另一种方法是对对象进行深度复制，去掉循环引用并对结果进行字符串化。

function cleanStringify(object) { if (object && typeof object === 'object') { object = copyWithoutCircularReferences([object], object); } return JSON.stringify(object); function copyWithoutCircularReferences(references, object) { var cleanObject = {}; Object.keys(object).forEach(function(key) { var value = object[key]; if (value && typeof value === 'object') { if (references.indexOf(value) < 0) { references.push(value); cleanObject[key] = copyWithoutCircularReferences(references, value); references.pop(); } else { cleanObject[key] = '###_Circular_###'; } } else if (typeof value !== 'function') { cleanObject[key] = value; } }); return cleanObject; } } // Example var a = { name: "a" }; var b = { name: "b" }; b.a = a; a.b = b; console.log(cleanStringify(a)); console.log(cleanStringify(b));

我在这里遇到了一个不同的问题，我从html元素中获取值到对象数组，在一个字段中，我不正确地分配值，这导致了这个异常。 错误表达式:obj.firstname=$("txFirstName") 正确表达式:obj.firstname=$("txFirstName").val()

我通常使用circular-json npm包来解决这个问题。

// Felix Kling's example
var a = {};
a.b = a;
// load circular-json module
var CircularJSON = require('circular-json');
console.log(CircularJSON.stringify(a));
//result
{"b":"~"}

注意:CircularJSON已弃用，我现在使用flatted(来自CircularJSON的创建者):

// ESM
import {parse, stringify} from 'flatted/esm';

// CJS
const {parse, stringify} = require('flatted/cjs');

const a = [{}];
a[0].a = a;
a.push(a);

stringify(a); // [["1","0"],{"a":"0"}]

来自:https://www.npmjs.com/package/flatted

我在NodeJS上是这样解决这个问题的:

var util = require('util');

// Our circular object
var obj = {foo: {bar: null}, a:{a:{a:{a:{a:{a:{a:{hi: 'Yo!'}}}}}}}};
obj.foo.bar = obj;

// Generate almost valid JS object definition code (typeof string)
var str = util.inspect(b, {depth: null});

// Fix code to the valid state (in this example it is not required, but my object was huge and complex, and I needed this for my case)
str = str
    .replace(/<Buffer[ \w\.]+>/ig, '"buffer"')
    .replace(/\[Function]/ig, 'function(){}')
    .replace(/\[Circular]/ig, '"Circular"')
    .replace(/\{ \[Function: ([\w]+)]/ig, '{ $1: function $1 () {},')
    .replace(/\[Function: ([\w]+)]/ig, 'function $1(){}')
    .replace(/(\w+): ([\w :]+GMT\+[\w \(\)]+),/ig, '$1: new Date("$2"),')
    .replace(/(\S+): ,/ig, '$1: null,');

// Create function to eval stringifyed code
var foo = new Function('return ' + str + ';');

// And have fun
console.log(JSON.stringify(foo(), null, 4));

根据zainengineer的回答…另一种方法是对对象进行深度复制，去掉循环引用并对结果进行字符串化。

function cleanStringify(object) { if (object && typeof object === 'object') { object = copyWithoutCircularReferences([object], object); } return JSON.stringify(object); function copyWithoutCircularReferences(references, object) { var cleanObject = {}; Object.keys(object).forEach(function(key) { var value = object[key]; if (value && typeof value === 'object') { if (references.indexOf(value) < 0) { references.push(value); cleanObject[key] = copyWithoutCircularReferences(references, value); references.pop(); } else { cleanObject[key] = '###_Circular_###'; } } else if (typeof value !== 'function') { cleanObject[key] = value; } }); return cleanObject; } } // Example var a = { name: "a" }; var b = { name: "b" }; b.a = a; a.b = b; console.log(cleanStringify(a)); console.log(cleanStringify(b));

在我的情况下，我只是忘记使用async/await的东西，而构建路由:

app.get('/products', async (req, res) => {
    const products = await Product.find();
    res.send(products );
});