multiple-file-upload.js

  if (Array.isArray(req.files.picture)) {
    if (req.files.picture.length > 6)
      return res.status(400).json({
        status: 400,
        message: `You can't upload more than 6 images at once`
      });

    for (let picture of req.files.picture) {
      if (!picture.mimetype.includes('image/'))
        return res.status(400).json({
          status: 400,
          message: `only images allowed for upload`
        });
    }
    let gallery = await Promise.all(
      req.files.picture.map(async single => {
        let image = await imageUploader(single);
        return image;
      })
    );
    let many = await galleryCollection.insertOne({
      title: req.body.title,
      image: gallery
    });
    return res.status(200).json({
      status: 200,
      data: {
        many,
        message: `Image uploaded successfully`
      }
    });
  }