app.js

const express = require('express');
const app = express();
const port = process.env.PORT || 3000;
const router = express.Router();
const bodyParser = require('body-parser');

const Todo = require('./todo');

app.use(function(req, res, next){
  res.header("Access-Control-Allow-Origin","*");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
  res.header("Access-Control-Allow-Methods", "PUT, POST, GET, OPTIONS");
  next();
})

app.use(express.static('public'));

app.use(bodyParser.json());

router.get('/', (req, res) => res.send('Hello World!'));

router.route('/todos')
  .get((req, res) => {
    Todo.all(function(data){
      console.log('Retrieving all Todos');
      res.json(data);
    })

  })
  .post((req, res) => {
    Todo.createDocument(req.body, function(data){
      console.log(`Todo created with id ${data._id}`);
      res.json(data);
    })
  })

router.route('/todos/:todo_id')
  .put((req, res) => {
    Todo.updateDocument(req.params.todo_id, req.body, function(data){
      console.log(`Todo id ${data._id} updated!`);
      res.json(data);
    });
  });


app.use('/', router);

app.listen(port, () => console.log(`Example app listening on port ${port}!`));