----------------- I'm doing this: ------------
collection.find({user: req.body.username,pass:
   crypto.createHash('md5').update(req.body.password).digest("hex")}).toArray(function(err, user_results) {
      console.log(user_results);
      console.log("in array: " + user_results.user);

------ which outputs: ----------
[ { _id: 4eaeed6ad79ec46c5a3eb961,
    user: '...',
    pass: '...',
    email: '...',
    name: '...',
    phone: '...',
    address: '...' } ]
in array: undefined