javascript - Converting circular structure to JSON Firebase - Stack Overflow

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The above is the returned object from firebase and I do this:

JSON.stringify(data) // where data is the returned object

Then I get the error: TypeError: Converting circular structure to JSON

How to properly handle an object response like that from firebase?

This answer paints a picture of what is happening, however, in the case of firebase, how to go about it?

The above is the returned object from firebase and I do this:

JSON.stringify(data) // where data is the returned object

Then I get the error: TypeError: Converting circular structure to JSON

How to properly handle an object response like that from firebase?

This answer paints a picture of what is happening, however, in the case of firebase, how to go about it?

• javascript
• json
• firebase

Share Improve this question Follow edited May 23, 2017 at 10:30 CommunityBot 111 silver badge asked Nov 19, 2016 at 12:55 KhoPhiKhoPhi 9,5571818 gold badges8585 silver badges139139 bronze badges

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2 Answers 2

Sorted by: Reset to default 4

You have to call the val() method...

JSON.stringify(data.val())

The proper way to handle the error "TypeError: Converting circular struct to JSON" when getting data from Firebase is to enumerate the key/value pairs explicitly and examine them:

Object.keys(data).forEach((key) => {
   let value = data[key];
   console.log(key + " : " + value);
});

The data you have is almost certainly not the data you think you have.

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