[javascript] TypeError: Converting circular structure to JSON in nodejs

I am using request package for nodejs

i am using this code here

 var formData = ({first_name:firstname,last_name:lastname,user_name:username, email:email,password:password});

  request.post({url:'http://localhost:8081/register', JSON: formData}, function(err, connection, body) {

and

exports.Register = function(req, res) {
    res.header("Access-Control-Allow-Origin", "*");
    console.log("Request data " +JSON.stringify(req));

here i am getting this error TypeError: Converting circular structure to JSON

Can anybody tell me what is the problem

Thanks

Try using this npm package. This helped me decoding the res structure from my node while using passport-azure-ad for integrating login using Microsoft account

https://www.npmjs.com/package/circular-json

You can stringify your circular structure by doing:

const str = CircularJSON.stringify(obj);

then you can convert it onto JSON using JSON parser

JSON.parse(str)

I came across this issue when not using async/await on a asynchronous function (api call). Hence adding them / using the promise handlers properly cleared the error.

Came across this issue in my Node Api call when I missed to use await keyword in a async method in front of call returning Promise. I solved it by adding await keyword.

use this https://www.npmjs.com/package/json-stringify-safe

var stringify = require('json-stringify-safe');
var circularObj = {};
circularObj.circularRef = circularObj;
circularObj.list = [ circularObj, circularObj ];
console.log(stringify(circularObj, null, 2));


stringify(obj, serializer, indent, decycler)

TypeError: Converting circular structure to JSON in nodejs: This error can be seen on Arangodb when using it with Node.js, because storage is missing in your database. If the archive is created under your database, check in the Aurangobi web interface.

I also ran into this issue. It was because I forgot to await for a promise.

It's because you don't an async response For example:

app.get(`${api}/users`, async (req, res) => {
    const users = await User.find()
    res.send(users);
   })