bug -> addUpload recibe {} object

api.js

var express = require("express");
var path = require('path');
var bodyParser = require('body-parser');

var uploadRepository = require("./uploads_repository")();

var router = express.Router();
router.use(bodyParser.urlencoded({ extended: false, limit: '50mb' }));
router.use(bodyParser.json());

router.get("/lastestuploads", function(req, res){
    uploadRepository.listUploads({}, req.query.page, req.query.numxpage, function(obj){
        if(obj.err == null){
            obj.pages = Math.ceil(obj.count/req.query.numxpage);
            obj.currentPage = req.query.page;
        }else{
            var obj = {};
            obj.error = err;
        }
        res.setHeader('Content-Type', 'application/json');
        res.send(JSON.stringify(obj));        
    });
});

router.post('/upload', function(req, res) {
    var Obj = {
        title : req.body.title,
        description : req.body.description,
        img : req.body.img,
        tags : req.body.tags,
        magnet : req.body.magnet,
    };
    uploadRepository.addUpload(Obj);
    res.send("todo ok wacha");
});

module.exports = router;

uploads_repository.js

module.exports = function () {
    var Datastore = require('nedb');
    db = {};
    db.uploads = new Datastore('./web/web_db/uploads.db');
    db.uploads.loadDatabase();

    module.addUpload = function (Obj) {
        db.uploads.insert(Obj, function (err, newDoc) {
            console.log(JSON.stringify(Obj));
           if(err != null)
                console.log(err);
           else
               console.log("Insert successfull: " + JSON.stringify(newDoc));
        });
    };

    module.listUploads = function(filter, callback){
        db.uploads.find(filter).sort({ timestamp: -1 }, function (error, documents) {
            obj = {
                err : error,
                docs : documents
            }
            if(err != null)
                console.log(err);
            callback(obj);
        });
    };

    module.listUploads = function(filter, page, count, callback){
        db.uploads.find(filter).sort({ timestamp: -1 }).skip(count * (page-1)).limit(count).exec(function (error, documents){
            obj = {}
            if(obj.err != null){
                console.log(err);                
                obj.err = err;
            }else{
                obj.docs = documents.slice(page-1*count,count-1);
                obj.count = documents.lenght;
            }
            callback(obj);
        });
    };

    return module;
};