Infinite JSON Tree Parser.js

//sample tree structure
var tree = [
  {
    id : "A",
    list : [
      {
        id : "A.A",
        list : [
          {
            id : "A.A.A",
            list : [
              {
                id : "A.A.A.A",
                list : []
              }
            ]
          }
        ]
      },
      {
        id : "A.B",
        list : [
          {
            id : "A.B.A",
            list : []
          }
        ]
      }
    ]
  },
  {
    id : "B",
    list : []
  }
];

/**
* recursive function to parse array
*/
function parseTree(array, level){
    level+=1;
  for(var i=0, len = array.length; i < len; i++){
    document.body.appendChild(document.createTextNode("Level---"+level+"  "+array[i].id));
      document.body.appendChild(document.createElement("br"));
    if(array[i].list.length > 0){
        parseTree(array[i].list,level);
    }
  }
}

//All the action...
parseTree(tree, 0);