Render an image with nodejs

Question

Render an image with nodejs

I am storing an image in mongodb with BinData type.

I can query the database using mongojs with this.

db.images.findOne({

                   file_name: 'temp.jpg',
                  },

              function(err, data){

                console.log(data.image); // image buffer appears on the console
                res.writeHead(200, {'Content-Type': 'image/jpg'});
                res.end(data.image);

           });

This produces "TypeError: first argument must be a string or Buffer".

I am pretty sure this has something to do with buffers or encoding. Can some please explain what I should be doing to the image-data before sending to the browser?

javascript
node.js
mongodb

Answer 1

set the correct content type
set the correct content length

short example how i serve my files from mongodb gridfs

.getFileFromGridFs(doc,function(err, buffer){
  if(err) return next(err)
  res.setHeader('content-type',doc.mimeType)
  res.setHeader('content-length',doc.size)
  buffer.pipe(res)
})