npm i express nodemon morgan dotenv

• express → 框架
• nodemon → 伺服器自動重啟
• morgan → 紀錄伺服器動作
• dotenv → 保護重要資訊

// .gitignore

node_modules
.DS_Store
Thumbs.db
.idea

// app.js

const dotenv = require('dotenv')
const express = require('express')
const morgan = require('morgan')
const path = require('path')

const app = express()
const PORT = process.env.PORT || 8081
dotenv.config()

app.use(morgan('dev'))
app.use(express.json())
app.use(express.urlencoded({ extended: true }))
app.use(express.static(path.join(__dirname, 'public')))

app.get('/', (req, res) => {
  res.json('hello world')
})

app.listen(PORT, () => {
  console.log(`The server is running on <http://localhost>:${PORT}`)
})