pins.use(function (req, res, next) {
    var skipErr = new HttpError('cant Skip', 400);
    var skipNumber = req.query.offset;

    var limitErr = new HttpError('cant Skip', 400);
    var limitNumber = req.query.limit;

    if (skipNumber !== undefined && limitNumber !== undefined ) {

        if (isNaN(skipNumber)) {
            skipErr.message = "offset type must be number";
            return next(skipErr);
        }
        if (skipNumber <= 0) {
            skipErr.message = "offset must be > 0";
            return next(skipErr);
        }


        if (isNaN(limitNumber)) {
            limitErr.message = "Limit type must be number";
            return next(limitErr);
        }
        if (limitNumber < 0) {
            limitErr.message = "Limit must be > 0";
            return next(limitErr);
        }



        var query = pinModel.find({}).skip(parseInt(skipNumber));
        query = query.find({}).limit(parseInt(limitNumber));
        query.exec(function (err, pins) {
            if (err) {
                skipErr.message = err.message;
                return next(skipErr);
            }

            res.locals.items = pins;
            res.locals.processed = true;
            return next();
        });
    } else {
        return next();
    }
});