Discussion on: Uploading Files to MongoDB with GridFS and Multer Using NodeJS

[Syed Zubair(zubi-droid)]

Thank you for this post sir.. Now I can upload my files to my mongo-atlas cluster successfully. Its very kind of you on my reach to this. I can now see the uploaded collections binary data on the collections (upl.files , upl.chunks) in mongo-atlas.

But I can't find a way to download a pdf file that i uploaded sir...Can u please help me on how to download a uploaded pdf file to my database sir. :{ Help sir.

[Shubham Battoo]

Hi Syed, you can do something like this to download a pdf or any other file for this matter

<a href="image/<%= file.filename %>" download><%= file.filename %></a>

I have created a route "image/:filename" which then downloads the image which is not limited to a image and can handle any other file types also, but for this demo I was only downloading images.

app.get("/image/:filename", (req, res) => {
  // console.log('id', req.params.id)
  const file = gfs
    .find({
      filename: req.params.filename
    })
    .toArray((err, files) => {
      if (!files || files.length === 0) {
        return res.status(404).json({
          err: "no files exist"
        });
      }
      gfs.openDownloadStreamByName(req.params.filename).pipe(res);
    });
});

[Syed Zubair(zubi-droid)]

Thank you so much for your help sir. What I have to do if i need to download the file that the user uploads from his end, and I have to download that from the database collection but not from the user side itself. if i'm not wrong, Like in google classroom app., we upload our assignments as .pdf to our professor and those attachments reaches him/her in their database(provided by that app.) and they download them on their end..... Is there any way to implement like this, sir. Any help would be appreciated.

[Vasanti Suthar]

Hey, thanks for this blog. I have implemented this but the file is not being able to download it says couldn't download.