TypeError Converting circular structure to JSON in nodejs

Question

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

User · Answer

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

User · Answer

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

User · Answer

JSON doesn t accept circular objects - objects which reference themselves  JSON stringify   will throw an error if it comes across one of these   The request  req  object is circular by nature - Node does that   In this case  because you just need to log it to the console  you can use the console s native stringifying and avoid using JSON   console log  Request data     console log req

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

It s because you don t an async response For example  app get    api  users   async  req  res    gt        const users   await User find       res send users

User · Answer

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

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

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