Terminal stuck at white starting nodejs

I'm trying to setup a nodejs based server, but unfortunately, when ever I run it via terminal, node app.js it returns console log thing what ever I declare in app.js file, and after that, it stuck, I can't not use it to process more tasks.

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

app.get('/files/:hash/:title', function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end(JSON.stringify(req.params));
  console.log('Done');
});
app.listen(8080);
console.log('Server running');

and terminal's response

root@mrboota13:/var/Node# node app.js
Server running
Done
Done
Done
Done
Done
Done
Done

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