app.js

var createError = require('http-errors');
var express = require('express');
var mongoose = require('mongoose');
var exphbs = require('express-handlebars');
var sassMiddleware = require('node-sass-middleware');
var browserify = require('browserify-middleware');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var todos = require('./routes/todos/index');
var todoAPI = require('./routes/todos/api');

var app = express();

// view engine setup
// app.set('views', path.join(__dirname, 'views'));
// app.set('view engine', 'jade');
app.engine('hbs',exphbs({extname:'.hbs',defaultLayout: 'layout'}));
app.set('view engine','hbs');

app.use(
  sassMiddleware({
    src: __dirname + '/sass',
    dest: __dirname + '/public',
    debug:true,
  })
);
app.get('/javascripts/bundle.js',browserify('./client/script.js'));

var dbConnectionString = process.env.MONGODB_URI || 'mongodb://localhost';
mongoose.connect(dbConnectionString + '/todos');

if (app.get('env') == 'development') {
  var browserSync = require('browser-sync');
  var config = {
    files: ["public/**/*.{js,css}", "client/*.js", "sass/**/*.scss", "views/**/*.hbs"],
    logLevel: 'debug',
    logSnippet: false,
    reloadDelay: 3000,
    reloadOnRestart: true
  };
  var bs = browserSync(config);
  app.use(require('connect-browser-sync')(bs));
}

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('/fonts', express.static(path.join(__dirname, 'node_modules/bootstrap-sass/assets/fonts')));

app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/todos',todos);
app.use('/api/todos',todoAPI);
// 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;