async

router.post('', multer({storage}).array('image', 5), (req, res, next) => {
    let images = [];
    const saveImage = async () => {
        await req.files.forEach((file) => {
            ImageModel.addImage(req, file, (error, savedImage) => {
                if (error) throw error;
                console.log(savedImage);
                images.push(savedImage);
            })
        });
        return images;
    };

    saveImage()
        .then(result => {
            console.log(result);
            res.status(200).json({
                status: 'success',
                images: result
            })
        })
        .catch(error => {
            res.status(502).json({
                status: 'fail',
                error
            })
        })
});