ARM template for function with key output

azuredeploy.json

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "appName": {
      "type": "string",
      "defaultValue": "[concat('fnapp', uniqueString(resourceGroup().id))]",
      "metadata": {
        "description": "The name of the function app that you wish to create."
      }
    },
    "storageAccountType": {
      "type": "string",
      "defaultValue": "Standard_LRS",
      "allowedValues": [
        "Standard_LRS",
        "Standard_GRS",
        "Standard_RAGRS"
      ],
      "metadata": {
        "description": "Storage Account type"
      }
    },
    "location": {
      "type": "string",
      "defaultValue": "[resourceGroup().location]",
      "metadata": {
        "description": "Location for all resources."
      }
    },
    "runtime": {
      "type": "string",
      "defaultValue": "node",
      "allowedValues": [
        "node",
        "dotnet",
        "java"
      ],
      "metadata": {
        "description": "The language worker runtime to load in the function app."
      }
    }
  },
  "variables": {
    "functionAppName": "[parameters('appName')]",
    "hostingPlanName": "[parameters('appName')]",
    "applicationInsightsName": "[parameters('appName')]",
    "storageAccountName": "[concat(uniquestring(resourceGroup().id), 'azfunctions')]",
    "functionWorkerRuntime": "[parameters('runtime')]",
    "insightsLocation": {
      "AzureCloud": "eastus",
      "AzureUSGovernment": "usgovvirginia"
    }
  },
  "resources": [
    {
      "type": "Microsoft.Storage/storageAccounts",
      "name": "[variables('storageAccountName')]",
      "apiVersion": "2019-06-01",
      "location": "[parameters('location')]",
      "kind": "Storage",
      "sku": {
        "name": "[parameters('storageAccountType')]"
      }
    },
    {
      "type": "Microsoft.Web/serverfarms",
      "apiVersion": "2019-08-01",
      "name": "[variables('hostingPlanName')]",
      "location": "[parameters('location')]",
      "sku": {
        "name": "Y1",
        "tier": "Dynamic"
      },
      "properties": {
        "name": "[variables('hostingPlanName')]",
        "computeMode": "Dynamic"
      }
    },
    {
      "apiVersion": "2019-08-01",
      "type": "Microsoft.Web/sites",
      "name": "[variables('functionAppName')]",
      "location": "[parameters('location')]",
      "kind": "functionapp",
      "dependsOn": [
        "[resourceId('Microsoft.Web/serverfarms', variables('hostingPlanName'))]",
        "[resourceId('Microsoft.Storage/storageAccounts', variables('storageAccountName'))]"
      ],
      "properties": {
        "serverFarmId": "[resourceId('Microsoft.Web/serverfarms', variables('hostingPlanName'))]",
        "siteConfig": {
          "appSettings": [
            {
              "name": "AzureWebJobsStorage",
              "value": "[concat('DefaultEndpointsProtocol=https;AccountName=', variables('storageAccountName'), ';EndpointSuffix=', environment().suffixes.storage, ';AccountKey=',listKeys(resourceId('Microsoft.Storage/storageAccounts', variables('storageAccountName')), '2019-06-01').keys[0].value)]"
            },
            {
              "name": "WEBSITE_CONTENTAZUREFILECONNECTIONSTRING",
              "value": "[concat('DefaultEndpointsProtocol=https;AccountName=', variables('storageAccountName'), ';EndpointSuffix=', environment().suffixes.storage, ';AccountKey=',listKeys(resourceId('Microsoft.Storage/storageAccounts', variables('storageAccountName')), '2019-06-01').keys[0].value)]"
            },
            {
              "name": "WEBSITE_CONTENTSHARE",
              "value": "[toLower(variables('functionAppName'))]"
            },
            {
              "name": "FUNCTIONS_EXTENSION_VERSION",
              "value": "~2"
            },
            {
              "name": "WEBSITE_NODE_DEFAULT_VERSION",
              "value": "~10"
            },
            {
              "name": "APPINSIGHTS_INSTRUMENTATIONKEY",
              "value": "[reference(resourceId('microsoft.insights/components', variables('applicationInsightsName')), '2018-05-01-preview').InstrumentationKey]"
            },
            {
              "name": "FUNCTIONS_WORKER_RUNTIME",
              "value": "[variables('functionWorkerRuntime')]"
            }
          ]
        }
      }
    },
    {
      "apiVersion": "2018-05-01-preview",
      "name": "[variables('applicationInsightsName')]",
      "type": "microsoft.insights/components",
      "location": "[variables('insightsLocation')[environment().name]]",
      "tags": {
        "[concat('hidden-link:', resourceId('Microsoft.Web/sites', variables('applicationInsightsName')))]": "Resource"
      },
      "properties": {
        "ApplicationId": "[variables('applicationInsightsName')]",
        "Request_Source": "IbizaWebAppExtensionCreate"
      }
    }
  ],
    "outputs": {

        "functionAppURL": {
            "type": "string",
            "value": "[reference(resourceId('Microsoft.Web/sites', variables('functionAppName')), '2019-08-01', 'Full').properties.defaultHostName]"
        },

        "allKeys": {
            "type": "object",
            "value": "[listkeys(concat(resourceId('Microsoft.Web/sites', variables('functionAppName')), '/host/default'), '2019-08-01')]"
        },
        "defaultFunctionKeys": {
            "type": "string",
            "value": "[listkeys(concat(resourceId('Microsoft.Web/sites', variables('functionAppName')), '/host/default'), '2019-08-01').functionKeys.default]"
        }
        // can be used to list individual function keys
        //,

        // "individualFunctionKeys": {
        //     "type": "object",
        //     "value": "[listkeys(concat(resourceId('Microsoft.Web/sites', variables('functionAppName')), '/functions/myfynctionName/keys'), '2019-08-01')]"
        // }

    }
}