app.get('/process_get', function (req, res) {
    response = {
        first_name:req.query.firstName,
        last_name:req.query.lastName,
        username:req.query.userName,
        password:req.query.password,
        email:req.query.email
    };
    console.log(response);
    res.end(JSON.stringify(response));
})

MongoClient.connect("mongodb://localhost:27017/exampleDb", function(err, db) {
    if(err) { return console.dir(err); }
    if(!err) { console.log("MongoDB server is connected!") }

    var collection = db.collection('test');
})