[devote]

<script>
function recur( my_array ){
    if ( my_array && typeof my_array === "object" && Object.prototype.toString.call( my_array ) === "[object Object]" ) {
        for (var Name in my_array) {
            document.write(Name + " = " + recur( my_array[Name] ) + "<br>");
        }
    } else {
        return my_array;
    }
}
recur({
    "lev1": {
        "lev2": {
            "lev3": {
                "lev4": "test"
            }
        }
    },
    "alev1": {
        "alev2": {
            "alev3": {
                "alev4": null
            }
        }
    }
});
</script>