app.js

var createError = require("http-errors");
var express = require("express");
var path = require("path");
var cookieParser = require("cookie-parser");
var logger = require("morgan");
const mongoose = require("mongoose");

var playlistRouter = require("./routes/playlist");

var app = express();

// view engine setup

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

if (process.env.NODE_ENV === "production") {
  app.use(express.static("mrclient/build"));
}

app.use("/playlist", playlistRouter);
// 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");
});

const uri = process.env.ATLAS_URI;
mongoose.connect(
  uri,
  {
    useNewUrlParser: true,
    useCreateIndex: true,
    server: { socketOptions: { keepAlive: 300000, connectTimeoutMS: 30000 } },
    replset: { socketOptions: { keepAlive: 300000, connectTimeoutMS: 30000 } },
  },
  function (err) {
    if (err) console.log(err);
  }
);

const connection = mongoose.connection;
connection.once("open", () => {
  console.log("MongoDB database connection established successfully");
});

module.exports = app;