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next.js/errors/circular-structure.md
Tim Neutkens b3045cc7a9
Implement circular JSON err.sh link (#6149) 
* Implement circular JSON err.sh link

* Add test for getInitialProps returning circular json

* Make test warn less

* Fix tests

* Add reference to original tests
2019-01-27 16:12:17 +01:00

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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.