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Converting circular structure to JSON

See original GitHub issue

Getting the below error since may be after the recent feathers lib update. The error appears randomly at the end of different services. Error goes away on disabling events (as of now app wide) using context.event = null;

TypeError: Converting circular structure to JSON
    --> starting at object with constructor 'Timeout'
    |     property '_idlePrev' -> object with constructor 'TimersList'
    --- property '_idleNext' closes the circle
    at Object.stringify [as serialize] (<anonymous>)
    at Object.emit (/xxx/node_modules/feathers-sync/lib/core.js:47:46)
    at /xxx/node_modules/@feathersjs/feathers/lib/events.js:16:42
    at Array.forEach (<anonymous>)
    at Object.<anonymous> (/xxx/node_modules/@feathersjs/feathers/lib/events.js:16:15)
    at /xxx/node_modules/@feathersjs/feathers/node_modules/@feathersjs/commons/lib/hooks.js:115:46
    at processTicksAndRejections (internal/process/task_queues.js:93:5)

Module versions (especially the part that’s not working):

    "@feathersjs/authentication-client": "^4.3.11",
    "@feathersjs/authentication-oauth": "^4.3.11",
    "@feathersjs/configuration": "^4.3.11",
    "@feathersjs/errors": "^4.3.11",
    "@feathersjs/express": "^4.3.11",
    "@feathersjs/feathers": "^4.3.11",
    "@feathersjs/socketio": "^4.3.11",
    "@feathersjs/socketio-client": "^4.3.11",
    "feathers-sequelize": "^6.1.0",
    "feathers-sync": "^2.0.0",

NodeJS version: v12.13.0

Not sure if my code is triggering this. Unable to understand as the code was working fine earlier.

Issue Analytics

State:
Created 4 years ago
Comments:9 (2 by maintainers)

Top GitHub Comments

1reaction

dafflcommented, Aug 16, 2020

You just have to make sure that none of your data in the context contain a circular reference. A custom serializer is one option to ensure that, another is to make sure that all params, result or data properties are serializable or serialized (e.g. with their toJSON methods).

0reactions

Artaudcommented, Mar 30, 2021

I had this issue when I was passing sequelize includes across feathers-sync. A simple fix was to use flatted as the serializer as it can serialize objects with circular references.

import {parse, stringify} from 'flatted';

app.configure(sync({
  uri: app.get('redis'),
  serialize: stringify,
  deserialize: parse
}))

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