app.js

var express = require("express");
var app = express();
var bodyParser = require("body-parser");
var session = require("cookie-parser");
var flash = require("express-flash");
var path = require("path");
app.use(bodyParser.json());
app.use(
  bodyParser.urlencoded({
    extended: true
  })
);
app.use(express.static(path.join(__dirname, "front-end/build")));
app.use(session());

// Database setup
require("./models/db.js");
require("./config/passport.js");

// Passport setup
var passport = require("passport");
app.use(passport.initialize());
app.use(passport.session());
app.use(flash());

const cors = require("cors");
app.use(cors());

var routes = require("./routes/routes.js");

app.use("/", routes);

// The 'catchall' handler: for any request that doesn't
// match one above, send back React's index.html file.
app.get("*", (req, res) => {
  res.sendFile(path.join(__dirname + "/front-end/build/index.html"));
});
// Using port 9000 to avoid conflict with front-end
const PORT = process.env.PORT || 9000;
// Start the server
app.listen(PORT, function() {
  console.log(`Express listening on port ${PORT}`);
});