text: 
  
  var createError = require('http-errors');
  var express = require('express');
  var dotenv = require('dotenv');
  var path = require('path');
  var cookieParser = require('cookie-parser');
  var logger = require('morgan');
  var { swaggerUi, specs } = require('./modules/swagger');
  
  var indexRouter = require('./routes/index');
  var homeRouter = require('./routes/home');
  var keywordRouter = require('./routes/keyword');
  var alarmRouter = require('./routes/alarm');
  var dotenv = require('dotenv');
  if (process.env.NODE_ENV == 'dev') {
    dotenv.config({
      path: path.resolve(process.cwd(), ".env")
    });
  }
  var mysqlConnection = require('./common/db_pool')(process.env.DB_HOST, process.env.DB_USER, 
    process.env.DB_PASSWORD, process.env.DB_DATABASE, process.env.DB_PORT);
  
  var app = express();
  
  // view engine setup
  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(function(req, res, next) {
    req.database = mysqlConnection;
    next();
  })
  
  app.use('/api-docs', swaggerUi.serve, swaggerUi.setup(specs));
  app.use('/', indexRouter);
  app.use('/home', homeRouter);
  app.use('/keyword', keywordRouter);
  app.use('/alarm', alarmRouter);
  
  // 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;
  var server = app.listen(process.env.PORT || 3000, function() {
    console.log('Express server listening on port ' + server.address().port);
  });
  