server.js

'use strict';
require('dotenv').config();

// first we import our dependencies...
var express = require('express');
var mongoose = require('mongoose');
var bodyParser = require('body-parser');
var Answer = require('./model/answers');

// and create our instances
var app = express();
var router = express.Router();

// set our port to either a predetermined port number if you have set it up, or 3001
var port = process.env.API_PORT || 3001;
var connectionString =
  'mongodb://' +
  process.env.USERNAME +
  ':' +
  process.env.PASSWORD +
  '@ds139219.mlab.com:39219/spanish1';
mongoose.connect(connectionString);
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'mongodb connection error'));

// now we should configure the API to use bodyParser and look for JSON data in the request body
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

// To prevent errors from Cross Origin Resource Sharing, we will set our headers to allow CORS with middleware like so:
app.use(function (req, res, next) {
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Credentials', 'true');
  res.setHeader(
    'Access-Control-Allow-Methods',
    'GET,HEAD,OPTIONS,POST,PUT,DELETE'
  );
  res.setHeader(
    'Access-Control-Allow-Headers',
    'Access-Control-Allow-Headers, Origin,Accept, X-Requested-With, Content-Type, Access-Control-Request-Method, Access-Control-Request-Headers'
  );

  // and remove cacheing so we get the most recent comments
  res.setHeader('Cache-Control', 'no-cache');
  next();
});

// now  we can set the route path & initialize the API
router.get('/', function (req, res) {
  res.json({ message: 'API Initialized!' });
});

router
  .route('/scenario')
  .get(function (req, res) {
    console.log(connectionString);
    Answer.find(function (err, answer) {
      if (err) res.send(err);
      res.json(answer);
    });
  })
  .delete(function (req, res) {
    Answer.remove({}, function (err, comment) {
      if (err) res.send(err);
      console.log('Database cleaned');
    });
  })

  .post(function (req, res) {
    var answer = new Answer();
    answer.user_answer = req.body.user_answer;
    answer.correct_answer = req.body.correct_answer;
    // user.password = req.body.password;

    answer.save(function (err) {
      if (err) res.send(err);
      res.json({ message: 'User successfully added' });
    });
  });

//Use our router configuration when we call /api
app.use('/api', router);

//starts the server and listens for requestshjh
app.listen(port, function () {
  console.log(`api running on port ${port}`);
});