server running continously (app.js)

app.js

const couponCodeDiscount = require("./routes/CouponCode.Routes");
app.use("/api", couponCodeDiscount);


// checking coupon code expiration time valid or not to reduce server load

const checkExpirationTime = () => {
    CouponCodeDiscount.find({})
        .exec()
        .then((Coupon) => {
            if (Coupon) {
                Coupon.map((getCoupon) => {
                    if (
                        new Date().getTime() >= new Date(getCoupon.expirationTime).getTime() // expirationTime data access from database
                    ) {
                    
                        CouponCodeDiscount.findOneAndDelete({
                                _id: getCoupon._id,
                            })
                            .exec()
                            .then((deleteCoupon) => {
                                console.log(`Coupon doesnt exists or expired`);

                            })
                            .catch((error) => {
                                console.log(error, "Error occured on coupon section");
                            });
                    }
                });
            }
            if (!Coupon) {
                console.log("No Coupon found...");
            }
        });
};
setInterval(checkExpirationTime, 1000); // converting to millisecond