uniqueStringSample.json

{
	"$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
	"contentVersion": "1.0.0.0",
	"parameters": {},
	"variables": {},
	"resources": [],
	"outputs": {
 "uniqueStringPerSubscription": {
 "value": "[uniqueString(subscription().subscriptionId)]",
 "type": "string"
 },
 "uniqueStringPerResourceGroup": {
 "value": "[uniqueString(resourceGroup().id)]",
 "type": "string"
 },
 "uniqueStringPerDeployment": {
			"value": "[uniqueString(resourceGroup().id, deployment().name)]",
			"type" : "string"
		}
	}
}