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---
title: 'Circular structure in `getInitialProps` result'
---
## Why This Error Occurred
`getInitialProps` is serialized to JSON using `JSON.stringify` and sent to the client side for hydrating the page.
However, the result returned from `getInitialProps` can't be serialized when it has a circular structure.
## Possible Ways to Fix It
Circular structures are not supported, so the way to fix this error is removing the circular structure from the object that is returned from `getInitialProps`.
For example, the `req` instance exposed is a circular object and can not be serialized, instead the specific fields such as relevant headers on the instance should be passed specifically.
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