对于我的例子，我在“First”文件夹中创建了React项目，我在这个文件夹中运行项目，所以我看到了同样的错误。你应该进入项目，然后你应该运行(为我的例子“反应电影”)。如果你看我的屏幕，你可以很容易地发现。

如果在包中添加第二个“scripts”键，也会发生此错误。json文件。如果您只在包中留下一个“脚本”键。Json时，错误消失。

我已经解决了我的问题。这不是一个NPM错误，它与代理行为有关。

如果你不支持代理，

MAC
 1.  Goto System Preference (gears icon on your mac)
 2.  click your network
 3.  click advanced
 4.  click proxy
 5.  check excludes simple hostnames
 6.  add this line below (Bypass Proxy Settings...) "localhost, localhost:8080"

refer to the npm echo: "Project is running at http://localhost:8080/"

Windows
 1.  Goto your browser Proxy Settings (google it)
 2.  check Bypass local address
 3.  add this line below "localhost, localhost:8080"

当我尝试运行"npm run start"时，我得到了同样的错误

我的项目应该以npm run serve启动

如果你复制一个github项目，你可以看看项目设置，就像这样:

所以一定要确保你用正确的命令运行它，在我的例子中是

npm run serve

检查包装。Json文件有“脚本”属性是否存在。如果不这样更新脚本属性

{
  "name": "csvjson",
  "version": "1.0.0",
  "description": "upload csv to json and insert it into MongoDB for a single colletion",
  "scripts": {
    "start": "node csvjson.js"
  },
  "dependencies": {
    "csvjson": "^4.3.4",
    "fs": "^0.0.1-security",
    "mongodb": "^2.2.31"
  },
  "devDependencies": {},
  "repository": {
    "type": "git",
    "url": "git+https://github.com/giturl.git"
  },
  "keywords": [
    "csv",
    "json",
    "mongodb",
    "nodejs",
    "collection",
    "import",
    "export"
  ],
  "author": "karthikeyan.a",
  "license": "ISC",
  "bugs": {
    "url": "https://github.com/homepage/issues"
  },
  "homepage": "https://github.com/homepage#readme"
}

确保端口是打开的

var app = express();
app.set('port', (process.env.PORT || 5000));

诸如此类，最后你得到了这个

app.listen(app.get('port'), function() {
    console.log("Node app is running at localhost:" + app.get('port'))
});

在node js中仍然是一个新手，但这导致了更多的这种情况。