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There are a few options. All of our SDKs use the exact same hashing algorithm, so as long as the user id is the same, the SDKs will return the same assigned variation. So you could either just share the user id between the front end and back end. Or you pass the assigned variation to the back end. Either way will work.

For debugging, we have a Chrome devtools extension that works with the React SDK. It lets you quickly force variations on the front end.

we'll do that for carrying the versions through