Create heirarchy of javascript properties in JSON (call via listPropertiesOf(aJSObject, depthLimit))

props.js

var excluded = [document];
var listPropertiesOf = function(object, maxDepth) {
    return listPropertiesOfWDepth(object, 0, maxDepth);
};
var listPropertiesOfWDepth = function(object, curDepth, maxDepth) {
    if(object == null) {
        return 'null';
    }
    /*
    console.log("listProperties called w/" + object + ', ' + curDepth + ', ' + maxDepth)
    */
    var returnString = '';
    var commaC = false;
    $.each(Object.keys(object), function(K, V) {
        if(commaC) {
            returnString += (', ');
        } else {
            commaC = true;
        }
        returnString += '\n';
        for(var i = 0; i < curDepth; i++) {
            returnString += '  ';
        }
        returnString += ('{ "' + V + '" : "');
        var obj = object[V];
        if(((typeof obj) == 'object') &&
                (curDepth < maxDepth) &&
                (obj != object) &&
                    !(excluded.some(
                        function(v,i,a) {
                             return (v == object)
                        }
                     )
                 )){
            returnString += listPropertiesOfWDepth(obj, (curDepth + 1), maxDepth);
        } else {
            returnString += obj;
        }
        returnString += '" }'
    });
    return returnString;
};