How to retrieve response message in failure function?

```
store.sync({
 success : function(){},
 failure : function(response, options){
   console.log(response.responseText); //it does not work, because there is responseText attr in response
 }  
});

```

Response Text is like this, 

```
{"success":false,"message":"Test Error"}

```

Anybody know, please advice me.

Thanks

[EDIT]

```
console.log(response); 

```

then,

![enter image description here](https://i.stack.imgur.com/JkK4P.jpg)