Protecting routes with authentication in Express

routes.js

var express = require('express');
var router = express.Router();
var bodyParser = require('body-parser');
var jwtauth = require('../../../jwtauth.js');

router.get('/', [bodyParser(), jwtauth], function(req, res) {
  //jwtauth is run automatically and will populate req.user if there is a valid token supplied
  if(!req.user) {
    res.status(401).send({error: "Unauthorized access"});
    return
  }
  
  //retrieve your data and pass it back
}