1.js

try {
        await Address.findOne({
            "number": req.body.flatNumber.toLowerCase(),
            "floor": req.body.floorNumber,
            "street": req.body.street.toLowerCase(),
            "block": req.body.block,
            "building": req.body.building,
            "postalCode": req.body.postalCode,
            "city": req.body.city.toLowerCase(),
        }, async (err, address) => {

            if (!address) {
                await new Address({
                    number: req.body.flatNumber.toLowerCase(),
                    floor: req.body.floorNumber,
                    street: req.body.street.toLowerCase(),
                    block: req.body.block,
                    building: req.body.building,
                    postalCode: req.body.postalCode,
                    city: req.body.city.toLowerCase(),
                    country: 'Czechia',
                    full: req.body.flatNumber.toLowerCase() + ',' + req.body.floorNumber + ',' + req.body.street.toLowerCase() + ',' + req.body.block + ',' + req.body.building + ',' + req.body.postalCode + ',' + req.body.city.toLowerCase()'
                });
                address.save();
            }

            let review = await new Review({
                title: req.body.title,
                description: req.body.description,
                landlordRating: req.body.landlordRating,
                buildingRating: req.body.buildingRating,
                areaRating: req.body.areaRating,
                overallRating: req.body.overallRating,
                createdAt: req.body.createdAt,
                address: address._id,
                owner: req.user._id
            });
            review.save();

        });

    } catch (e) {
        console.log(e);
    }