[TypeError: JSON.stringify cannot serialize cyclic structures.] object

I’m getting error [TypeError: JSON.stringify cannot serialize cyclic structures.] object when i try to convert realm object to json object using JSON.parse(JSON.stringify(item))

[steffenagger]

Yes toJSON() returns the same structure, where instances of Realm.Object & Realm.Collection has been replaced by flat JS objects & arrays. For more info on toJSON, see MDN toJSON.

Realm.JsonSerializationReplacer is intended as a replacer (2nd argument) for JSON.stringify, is this how you utilized it? (see example bellow).

const chats = realm.objects('Chat');
const serialized = JSON.stringify(chats, Realm.JsonSerializationReplacer)

If downgrading to realm@6.0.3 fixed the circular structure error, could I ask you to supply some code or a small project (node/RN version used), where the error occurs in 6.1.0 and not in 6.0.3?

[steffenagger]

@mahipalsingh-syt Realm.JsonSerializationReplacer is only intended for serialization to a string, where serialization is not possible due to circular references (e.g. a JSON export) - the added $ref is to indicate, in a readable manner, to where the circular reference points. In other words: parsing it would require additional logic.

If you’re “just” trying to make a copy of the Realm.Object as plain JS (your naming highly indicates this), then please try this instead (only works on 6.1.0+):

/** Converts a Realm.Object into a plain JS object */
export const copyRealmObject = (item: Realm.Object) => item.toJSON()

/** Converts a Realm.Collection, Realm.List or Realm.Results into a plain JS array, containing plain JS objects */
export const copyRealmCollection = (collection: Realm.Collection) => collection.toJSON()

This should keep the circular references through the objects.

Let me know if it yields problems.