Reading directory of files and importing into mongo

import.js

var fs = require('fs');
var file = __dirname + '/test.json';
var Mongolian = require("mongolian");
var server = new Mongolian;
var db = server.db("db");
var collection = db.collection("collection");


fs.readdir('/path/to/html/files', function(err, files) {
    files.filter(function(file) { return file.substr(-5) == '.json'); })
         .forEach(function(file) { 
          fs.readFile(file, 'utf8', function (err, data) {
            if (err) {
              console.log('Error: ' + err);
              return;
            }
          collection.insert(JSON.parse(data), function(){
            console.log('Done!');
          });

        });
     });
});