app.js

var express = require("express");
var path = require("path");
var cookieParser = require("cookie-parser");
var logger = require("morgan");
require("dotenv").config();
var indexRouter = require("./routes/index");
var apiRouter = require("./routes/api");
var apiResponse = require("./helpers/apiResponse");
var cors = require("cors");

// DB connection
var MONGODB_URL = process.env.MONGODB_URL;
var mongoose = require("mongoose");
mongoose
  .connect(MONGODB_URL, { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => {
    //don't show the log when env is test
    if (process.env.NODE_ENV !== "test") {
      console.log("Connected to %s", MONGODB_URL);
      console.log("App is running ... \n");
      console.log("Press CTRL + C to stop the process. \n");
    }
  })
  .catch((err) => {
    console.error("App starting error:", err.message);
    process.exit(1);
  });

var app = express();

if (process.env.NODE_ENV !== "test") {
  app.use(logger("dev"));
}
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, "public")));

//To allow cross-origin requests
app.use(cors());

//Route Prefixes
app.use("/", indexRouter);
app.use("/api/", apiRouter);

// throw 404 if URL not found
app.all("*", function (req, res) {
  return apiResponse.notFoundResponse(res, "Page not found");
});

// Error Handler
app.use((err, req, res, next) => {
  if (err.name == "UnauthorizedError") {
    return apiResponse.unauthorizedResponse(res, err.message);
  } else if (err.name == "ValidationError") {
    return apiResponse.validationErrorWithData(res, err.message)
  } else {
    if (res.headersSent) {
      return next(err)
    }
    console.log("errors", err);
    return apiResponse.ErrorResponse(res, err);
  }
});

module.exports = app;