Download a file from NodeJS Server using Express

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How can I download a file that is in my server to my machine accessing a page in a nodeJS server?

I’m using the ExpressJS and I’ve been trying this:

app.get('/download', function(req, res){

  var file = fs.readFileSync(__dirname + '/upload-folder/dramaticpenguin.MOV', 'binary');

  res.setHeader('Content-Length', file.length);
  res.write(file, 'binary');
  res.end();
});

But I can’t get the file name and the file type ( or extension ). Can anyone help me with that?

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