Sample ARM template with outputs

arm-template.json

{
    "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "cosmosAccountName": {
            "type": "string"
        }
    },
    "variables": {
        "cosmosDbApiVersion": "2015-04-08"
    },
    "resources": [
        {
            "apiVersion": "[variables('cosmosDbApiVersion')]",
            "type": "Microsoft.DocumentDB/databaseAccounts",
            "kind": "GlobalDocumentDB",
            "name": "[parameters('cosmosAccountName')]",
            "location": "[resourceGroup().location]",
            "properties": {
                "databaseAccountOfferType": "Standard",
                "locations": [
                    {
                        "locationName": "[resourceGroup().location]",
                        "failoverPriority": 0
                    }
                ]
            }
        }
    ],
    "outputs": {
        "cosmosAccountEndpoint": {
            "type": "string",
            "value": "[reference(concat('Microsoft.DocumentDB/databaseAccounts/', parameters('cosmosAccountName'))).documentEndpoint]"
        },
        "cosmosAccountKey": {
            "type": "string",
            "value": "[listKeys(concat('Microsoft.DocumentDB/databaseAccounts/', parameters('cosmosAccountName')), variables('cosmosDbApiVersion')).primaryMasterKey]"
        }
    }
}