Retrieve image from GridFS

display_png_from_gridfs.js

var express = require('express');
var app = express();

var Db = require('mongodb').Db,
    MongoClient = require('mongodb').MongoClient,
    ObjectID = require('mongodb').ObjectID,
    GridStore = require('mongodb').GridStore;

app.get("/myimage.png", function(req, res) {
  MongoClient.connect("mongodb://localhost:27017/mydb", function(err, db_) {
    var fileId = new ObjectID("51ebba1b2ca657f0d0000087");
    var file = new GridStore(db_, fileId, "r");

    file.open(function(err, file) {
      res.set('Content-Type', file.contentType);  
      var stream = file.stream();
      stream.pipe(res);
    });
  });
});

app.listen(nconf.get('port'));
console.log('Listening on port ' + nconf.get('port'));