Finding out number of occurence of a key in a nested JS object

I have a nested object like

{
name: "John",
parent:{
 parent:{
  parent:{
  }
 }
}
}

Now I want to get the level of the master parent object or basically how many times a parent object has been nested. In this case, I should be getting an output of 3.

>Solution :

You could also do it recursively like this:

const obj = {
name: "John",
parent:{
 parent:{
  parent:{
    parent:{
     parent:{
      parent:{
       }
      }
     }
    }
   }
  }
 }
function findk(o,k,l=0){
  if (o[k]) l=findk(o[k],k,++l)
  return l
}
console.log(findk(obj,"parent"))