Node.js turn querystring params into JSON

index.js

var http = require('http'),
	url = require('url'),
	util = require('util');

	http.createServer( function (req, res) {

		res.writeHead( 200, {'Content-Type': 'text/plain'} );

		var qs = url.parse( req.url, true );
		res.write( util.inspect( qs.query ) );
		res.end('\n');

}).listen(8000);

console.log('Server running at port 8000');

Turns this URL: http://localhost:8000/?id=123&a=apple&b=baby
Into this JSON: { id: '123', a: 'apple', b: 'baby' }

What about nested key, like auth[email] ?