javascript - Converting circular structure to JSON? - Stack Overflow

admin管理员组

文章数量:1344543

I am getting it from database I want to format this data but I am getting below error

TypeError: Converting circular structure to JSON

    --> starting at object with constructor 'NativeConnection'

    |     property 'base' -> object with constructor 'Mongoose'

    |     property 'connections' -> object with constructor 'Array'

    --- index 0 closes the circle

    at JSON.stringify (<anonymous>)

    at formatReportOutput (E:\Application\routes\data.js:97:50)

Below is my data getting it from database

var routput = [{

        "_id" : ObjectId("59920689253dfa0544f26b93"),
        "INumber" : "535264",
        "IID" : "25544825",
        "DateReceived" : ISODate("2017-08-14T20:22:33.350Z"),

    }]

My code : Below is my code to differentiate header and value and format value. Format value means mongodb id ,date

Expected output:

Headers : _id,INumber,IID,DateReceived

values:59920689253dfa0544f26b93,535264,25544825,2017-08-14

when i pass any data automatically it should display in table(ng-table(angularjs)) which means no need to hard code headers what ever we pass it should display .

please help me with this.

I am getting it from database I want to format this data but I am getting below error

TypeError: Converting circular structure to JSON

    --> starting at object with constructor 'NativeConnection'

    |     property 'base' -> object with constructor 'Mongoose'

    |     property 'connections' -> object with constructor 'Array'

    --- index 0 closes the circle

    at JSON.stringify (<anonymous>)

    at formatReportOutput (E:\Application\routes\data.js:97:50)

Below is my data getting it from database

var routput = [{

        "_id" : ObjectId("59920689253dfa0544f26b93"),
        "INumber" : "535264",
        "IID" : "25544825",
        "DateReceived" : ISODate("2017-08-14T20:22:33.350Z"),

    }]

My code : Below is my code to differentiate header and value and format value. Format value means mongodb id ,date

Expected output:

Headers : _id,INumber,IID,DateReceived

values:59920689253dfa0544f26b93,535264,25544825,2017-08-14

when i pass any data automatically it should display in table(ng-table(angularjs)) which means no need to hard code headers what ever we pass it should display .

please help me with this.

• javascript
• jquery
• node.js

Share Improve this question Follow edited Nov 27, 2019 at 8:47 realme asked Nov 19, 2019 at 12:24 realmerealme 5322 silver badges88 bronze badges 3

• adding code responsible for database connection as well as printing the output of formatOutput function would help understanding the issue – Jakub Licznerski Commented Nov 19, 2019 at 13:25
• i already given database(mongodb) output(routput ) – realme Commented Nov 19, 2019 at 13:35
• you gave an error description, not the code with the call which triggered the error – Jakub Licznerski Commented Nov 19, 2019 at 13:37

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 8

Maybe you didn't use await with mongoose method. I forgot to add await and then that error occur:

 const indexUsers = async (req, res, next) => {
        try {
            const users = await db.User.find();
            return res.status(200).json(users);
        } catch (err) {
            next(err);
        }
    };

Convert the document retrieved from mongo to a plain javascript object before calling formatOutput or use lean() in your query.

Assuming routput es from a mongoose query, formatOutput might work as expected if you call .lean() on the query or .toObject() on the array instances prior to passing it to the function.

So, something like this:

var routput = await Model.find().lean();
var header ="Yes";
formatOutput(routput, header);

Or this:

var routput = await Model.find();
var header ="Yes";
formatOutput(routput.map(x => x.toObject()), header);

Should be sufficient.

References:

• https://mongoosejs./docs/api.html#document_Document-toObject
• https://mongoosejs./docs/tutorials/lean.html

本文标签： javascriptConverting circular structure to JSONStack Overflow