server.js

const db = require('./models')
const express = require('express');
const bodyParser = require('body-parser');
const path = require('path');
var cors = require('cors');

const app = express();
const PORT = process.env.PORT || 8080;

const routes = require('./routes/routes.js');


app.use(cors()); // Use this after the variable declaration

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

// parsing AJAX requests
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

// allow CORS:
app.use(function (req, res, next) {
  res.setHeader('Access-Control-Allow-Origin', 'http://localhost:3000');
  res.setHeader("Access-Control-Allow-Methods", "GET,HEAD,OPTIONS,POST,PUT");
  next();
});

// routes
app.use('/api/', routes);

app.use(express.static(path.join(__dirname, './index.html')));

app.get('/', (req, res) => {
    res.sendFile(path.join(__dirname, './index.html'));
});

// Anything that doesn't match the above, send back index.html
app.get('*', (req, res) => {
  // const root_path = 
  res.sendFile(path.join(__dirname, './404.html'));
});