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I think this should do it

export const appHostMasterKey = app.functionApp   .getHostKeys().apply((keys) => keys.masterKey);

Sorry for the delay in replying. I am using the .net Pulumi packages and I still cannot find any options similar to above for listing keys. I have rooted around in the source code and still not seeing it. Should I be expecting parity across the languages?

yep, you're right

I was aiming to run some quick smoke tests as part CI to verify the deployment of my HTTP triggered functions that expect the key as part of the request. So to do so I require the functions host key. I was hoping I could output it and use as part of the test config. I guess a more correct way of doing it would be to create a key vault and use that as the config source. However that would still need to list out the keys to populate.

I think your individual functions within your app would have host keys

Yeah I understand that but after more rooting in the .net source code it seems the getHostKeys or similar is not there. Probably going to give a rewrite into Typescript a try. Thanks for the pointers.