Fabric iOS support in app.json

I see on the documentation of app.json that you can pass Fabric keys. Does this work on iOS as well?
Is there any documantation for working with Expo and Crashilytics?

I believe it does but I think these only work with standalone apps.

If you are not ejecting/detaching to ExpoKit or building a standalone app, this won’t work.

In general, if you’re not writing your own native code, I’d advise using Sentry for JS stack traces and Amplitude for metrics since those can both be done without any native code modifications.

Fabric doesn’t work on iOS standalone apps, but it does for Android. See this doc.

some other links / explanation from @ben that is relevant here: