app.js

// Adding library
const express = require("express");
const cors = require("cors");
const rootRouter = require("./routes/rootRoute");
require("dotenv").config();

// Create express app
const app = express();

// Use express modules
var whitelist = ["http://localhost:3000", "https://mochi-machi.vercel.app"];
var corsOptions = {
  origin: function (origin, callback) {
    console.log("This is the origin: ", origin);
    if (whitelist.indexOf(origin) !== -1) {
      callback(null, true);
    } else {
      callback(new Error("Not allowed by CORS"));
    }
  },
};
app.use(cors(corsOptions));
app.use(express.json());

// port 3000 is being used by MochiMachi client side
app.set("port", process.env.PORT || 3001);

// Distribute requests to routes
app.use("/", rootRouter);

// ------Below is default set up for express----
// Hanlde 404
app.all("*", (req, res) => {
  return res.status(404).send("Damn! Resource not found");
});

// Express server listening
app.listen(app.get("port"), (err) => {
  if (err) {
    return console.log("ERROR", err);
  }
  console.log(`Server listening at port: ${app.get("port")}`);
});

// Export the Express API for Vercel to turn Express into a serverless function
module.exports = app;