Find value of a Key in nested JSON using underscore : Hi I have a JSON object that look like this:

    var data={
         
          req:{
             id:1,
             name:"daniel",
             details:{
               address:"201 sd f",
                city: "dshed"
             }
          },
          ack:"Success"
    }

Now I want to get the value of key "ack". Does anyone know how to get value of ack using underscore?