I am trying to create a tree using nodejs and mongodb.Wanted to show a path of a particulr node from the root.So I am finding the destination path and looping back to its parent iteratively until the root.So this is the snippet I am using which results in infinite looping

articleProvider.finditsparent(t,function(error,tap){
            if(tap[0].parent=='null')
        {
              t=(tap[0].parent);    
            console.log(n);

        }
        else
        {
          n.push(tap[0].parent);
          console.log(tap[0].parent);
          t=(tap[0].parent);
          res.send(n);
        }
        });



    res.send(n);
});

How should I get rid of this problem?Is there any way to call it recursively?