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 indexRouter = require("./routes/index");
const usersRouter = require("./routes/users");
const catalogRouter = require("./routes/catalog"); //Import routes for "catalog" area of site
const compression = require("compression");
const helmet = require("helmet");


var app = express();

// Set up mongoose connection
const mongoose = require("mongoose");
//const mongoDB = "mongodb+srv://myUserName:Password123@cluster0.fwgg2iz.mongodb.net/?retryWrites=true&w=majority";
// Set up mongoose connection
const dev_db_url =
  "mongodb+srv://myUserName:Password123@cluster0.fwgg2iz.mongodb.net/?retryWrites=true&w=majority";
const mongoDB = process.env.MONGODB_URI || dev_db_url;
console.log("mongo URI:",process.env.MONGODB_URI, mongoDB);

mongoose.connect(mongoDB, { useNewUrlParser: true, useUnifiedTopology: true });
const db = mongoose.connection;
db.on("error", console.error.bind(console, "MongoDB connection error:"));

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

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

app.use(compression()); // Compress all routes
app.use(helmet());

app.use(express.static(path.join(__dirname, 'public')));

app.use("/", indexRouter);
app.use("/users", usersRouter);
app.use("/catalog", catalogRouter); // Add catalog routes to middleware chain.
// 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');
});

module.exports = app;