Where do i find the function key for a locally deployed Azure Function?

Have a deployed azure functions with docker compose locally using net6.0.

Need to call the function from another local api service, adding the x-functions-key in the header.

The function has the auth attribute: AuthorizationLevel.Function

How do i find the default or master key for the locally deployed azure function?

I have tried various dummy keys and all sent 401 unauthorized back. I have also found a folder called DataProtection-Keys with a xml file containing keys, but these did not work either.

You have two ways to get the key:

1. Set your own key

Set a master key of your own and pass it into the container, so that the container will always accept that key.

Step 1: Create a test_host_keys.json file locally with the following contents:

{
  "masterKey": {
    "name": "master",
    "value": "test", <-- this will be the host key you use
    "encrypted": false
  },
  "functionKeys": []
}

Step 2: Invoke docker with two extra parameters:

• -e AzureWebJobsSecretStorageType=files to make it use local auth keys
• -v path/to/your/test_host_keys.json:/azure-functions-host/Secrets/host.json to set the custom host keys

(This is an improvement on this answer, since with this you can use the same Dockerfile for local testing and for production)

2. Get it from the running container.

In the container, look inside the /azure-functions-host/Secrets/ folder for a .json file

Read that file to find the default key. It'll look something like the following:

> cat /azure-functions-host/Secrets/[thefile].json

root@5b9250f41cc6:/# cat /azure-functions-host/Secrets/some_trigger.json 
{
  "keys": [
    {
      "name": "default",
      "value": "buoxxxxxxxxxxxxxxxxxxxxxxxxxxxxx==", <-- your key
      "encrypted": false
    }
  ],
  "hostName": null,
  "instanceId": "000000000000000000000000xxxxxxxx",
  "source": "runtime",
  "decryptionKeyId": ""
}