app.js

var createError = require("http-errors");
var express = require("express");
var path = require("path");
var cookieParser = require("cookie-parser");
var logger = require("morgan");
var cors = require("cors"); // prevent cors errors
const bodyParser = require("body-parser");
const helmet = require("helmet");
require("dotenv").config();

var indexRouter = require("./routes/index");

var app = express();

// view engine setup
app.set("views", path.join(__dirname, "views"));
app.set("view engine", "jade");

app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

app.use(helmet());
app.use(cors()); // use cors module
app.use(
  cors({
    // origin: [/http:\/\/localhost:\d+$/],
    allowedHeaders: ["Content-Type", "Authorization"],
    credentials: true
  })
);

app.use(logger("dev"));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());

if (process.env.NODE_ENV === "production") {
  // Serve any static files
  app.use(express.static(path.join(__dirname, "client/build")));
  // Handle React routing, return all requests to React app
  app.get("*", function(req, res) {
    res.sendFile(path.join(__dirname, "client/build", "index.html"));
  });
}

// app.use(express.static(path.join(__dirname, 'public')));
// app.use(express.static(path.join(__dirname, 'client/build')));
app.use("/", indexRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get("env") === "development" ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render("error");
});

// app.get("/", function(req, res, next) {
//   // we could use this route as a place for documentation???
//   res.json("Welcome to the Calcumon API");
// });

console.log("SERVER RUNNING");

module.exports = app;