참고 코드 - app.js

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var bodyParser = require('body-parser');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var uploadRouter = require('./routes/upload');
var orderRouter = require('./routes/order');
const partnerRouter = require('./routes/partner');
const partnerOrderRouter = require('./routes/partner_order');
const db = require('./dbconn');

var app = express();
const fs = require('fs');

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

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('/upload', express.static('uploads'));

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));

// app.use('/', indexRouter);
// app.use('/users', usersRouter);
// app.use('/upload', uploadRouter);
// app.use('/order', orderRouter);
// app.use('/partner', partnerRouter);
// app.use('/partner_order', partnerOrderRouter);

const dir = path.join(__dirname, 'routes');
fs.readdirSync(dir)
    .forEach(file => {
        var name = file.substr(0, file.indexOf('.'));
        require('./routes/' + name)(app);
    });

// 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');
});

app.db = db;

module.exports = app;