app.js

/* --- Import Files ---  */
var path = require('path');
var createError = require('http-errors');
var cookieParser = require('cookie-parser');
var express = require('express');
var cors = require('cors');
var logger = require('morgan');
var {appLogger, errorLogger} = require('./logs/logger'); /* Logging Application-level events */
const dotenv = require('dotenv')
dotenv.config();

/* -- Launching an Express JS Application -- */
var app = express(); 

try{ // Fail-safe error handling execution
  appLogger.info("[STARTED]: Running Patient Finder Backend Application");

  /* -- Application configurations -- */

  /* Route Settings (for APIs used by external system, for ex: clients-browsers) */
  var indexRouter = require('./routes/index');
  var usersRouter = require('./routes/users');
  var pfRouter = require('./routes/patientfinder');


  /* Setting up a basic view pages for Backend (Can only be accessed over HTTP) */
  app.set('views', path.join(__dirname, 'views'));
  app.set('view engine', 'jade');

  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')));
  app.use(cors())

  /* --- Route Handlers --- */
  app.use('/', indexRouter);
  app.use('/users', usersRouter);
  app.use('/patientfinder', pfRouter);

  /* 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');
  });
  
}catch(err){
  console.log(err);
  errorLogger.error(err);
}

module.exports = app;