flat.js

var flatten = function(obj, cKey, returnObj) {
    result = returnObj || {};
    for(var key in obj) {
        var newKey = cKey ? cKey + '.'+ key : key;
        if(!(obj[key] instanceof Object)) {
            result[newKey] = obj[key];
        } 
        else if (obj[key] instanceof Object){
            flatten(obj[key], newKey, result);
        }
    }
    return result;
}