server.js

"use strict";

/* Server environment setup */
// To run in development mode, run normally: node server.js
// To run in development with the test user logged in the backend, run: TEST_USER_ON=true node server.js
// To run in production mode, run in terminal: NODE_ENV=production node server.js
const env = process.env.NODE_ENV; // read the environment variable (will be 'production' in production mode)

const log = console.log;
const path = require("path");

const express = require("express");
// starting the express server
const app = express();

// enable CORS if in development, for React local development server to connect to the web server.
const cors = require("cors");
if (env !== "production") {
  app.use(cors());
}

// Serve the build
app.use(express.static(path.join(__dirname, "/client/build")));

// All routes other than above will go to index.html
app.get("*", (req, res) => {
  // send index.html
  res.sendFile(path.join(__dirname, "/client/build/index.html"));
});

// Express server listening...
const port = process.env.PORT || 5000;
app.listen(port, () => {
  log(`Listening on port ${port}...`);
});