[xdarkV]

var obj = {
    "database.host": "127.0.0.1",
    "database.user": "test",
    "database.password": "qwerty",
    "rest.photo.host": "127.0.0.2",
    "rest.users.host": "127.0.0.3",
    "rest.users.password": "p@ssw0rd",
    "baseUrl": "test.com",
    "limit": 10
};

var result = {};

Object.keys(obj).forEach(function (name) {

    var path = result, names = name.split("."), len = names.length;
    names.forEach(function (subName, index) {
        if (!path[subName]) {
            if (index == len - 1) {
                path[subName] = obj[name];
            } else {
                path[subName] = {};
            }
        }
        path = path[subName];
    });

});

alert(JSON.stringify(result , "", 4));

Я вот сделал чуток по-другому, но работает только если оставить "database.host": "127.0.0.1". Где ошибка?

var obj = {
     "database.host": "127.0.0.1",
     "database.user": "test",
     "database.password": "qwerty",
     "rest.photo.host": "127.0.0.2",
     "rest.users.host": "127.0.0.3",
     "rest.users.password": "p@ssw0rd",
     "baseUrl": "test.com",
     "limit": 10	 
   };
   
 
var len;
var names;
var res;
var result = {};
var keys = Object.keys(obj);
 
 function createObject (name)
 { 
    res =result; 
	names=name.split('.');
	len=names.length;	
	names.forEach (resultObject);
  };
  for (var i=0;i<keys.length;i++) 
  {
	var arr =[];
	arr[0]=keys[i];
  arr.forEach(createObject);
  }
 function resultObject (subName, index)
 {console.log(index+'-'+subName);
   if (!res[subName]) 
   {
            if (index == len-1) 
			{
				 res[subName] = obj[keys];
            } 
			else 
			{
                res[subName] = {};
            }
    }
	  res = res[subName];
		 };
alert (JSON.stringify(result , "", 4));

[/quote]