AuthController.js

app.get('/callback', function(req, res) {
  var code = req.param('code');
	var request = require('request');
	var body = 'client_id=REDACTED&client_secret=REDACTED&grant_type=authorization_code&redirect_uri=http://textr.dev/callback';
	var auth_request = request.post({
		uri: 'https://account.app.net/oauth/access_token',
		body: body,
		headers: {
			'Content-Length': body.length
		}
	}, function(err, header, body) {
		if (!err) {
			console.log('Response body: ' + body);
			res.send('Response body: ' + body);
		} else {
			res.send("Error occured: " + err);
		}
	});
});