第一次用webpack，配置好后運行npm run dev結果報錯了，在網上搜了很多資料都無法解決，求前輩們指點以下！不勝感激！！

報錯內容

npm ERR! code EJSONPARSE
npm ERR! Failed to parse json
npm ERR! Unexpected token / while parsing '{
npm ERR!   "name": "vue-loader-demo",
npm ERR!   "versio'
npm ERR! File: /Users/sylvia/Documents/FE/Practice/vue/vue-loader-demo/package.json
npm ERR! Failed to parse package.json data.
npm ERR! package.json must be actual JSON, not just JavaScript.
npm ERR! 
npm ERR! Tell the package author to fix their package.json file. JSON.parse

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/sylvia/.npm/_logs/2018-04-17T12_39_56_372Z-debug.log

package.js

{
  "name": "vue-loader-demo",
  "version": "1.0.0",
  "description": "",
  "main": "main.js",
  "scripts": {
    "build": "webpack",
    "dev": "webpack-dev-server --devtool eval --progress --colors --hot" //意思是自動刷新屏幕
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "webpack": "^4.5.0",
    "webpack-dev-server": "^3.1.3"
  }
}

文件結構

|-index.html

|-main.js    

|-App.vue   

|-package.json  

|-webpack.config.js