Send file back after GET request Node.js - node.js

Question

I am trying to build a REST API using a MEAN stack and I have encountered a problem. I am saving a .txt file sent in a POST request to the server and saving it using multer in an /uploads folder. I am then saving the req.file information in a collection on mongodb (path included).
The problem that I have now is that I want to be able to handle a GET request for that specific file with the ObjectId. However I want to be able to get the file from the file path and then send it to the user making the GET request.
Right now I am only returning the information corresponding to the ObjectId passed, not the file. How can I send back the whole .txt file back to the user?
exports.findById = function(req, res) {
try
{
var id = new require('mongodb').ObjectID(req.params.id);
console.log('Retrieving log: ' + id);
db.collection('logs', function(err, collection) {
if(err)
{
console.log(err);
}
else
{
collection.findOne({'_id':id}, function(err, item) {
if (err) {
console.log('Error finding log: ' + err);
res.send({'error':'An error has occurred'});
} else {
console.log('' + item + ' found log');
console.log(item.path);
var file = __dirname + item.path;
res.download(file);
//res.send(item);
}
});
}
});
}
catch (e)
{
console.log('Id passed not correct');
res.send({'error':'Id passed not correct'});
}
};

Answer 1

At the end I finally got the server to respond to the GET request.
I had to find the file path of the file that had been saved into the database.
collection.findOne({'_id':id}, function(err, item) {
if (err)
{
console.log('Error finding log: ' + err);
res.send({'error':'An error has occurred'});
}
if (item)
{
//Create the path of the file wanted
filepath = path.join(__dirname, "../uploads", path.normalize(item.filename));
//Send file with the joined file path
res.sendFile(filepath);
}
else
{
console.log("Could not find entry");
res.send({'error':'No match found'});
}
});
This enabled me to send the file back by getting the full path of the file.