title: 'npm start' in node.js doesn't works
body: <p>node App.js works, but npm start doesn't works.</p>
  
  <p>I just followed <a href="http://webframeworks.kr/tutorials/nodejs/api-server-by-nodejs-01/" rel="nofollow noreferrer">this nodejs tutorial</a> (tutorial is written by Korean).</p>
  
  <p>I tried to change code to:</p>
  
  <p>"scripts": {
      "start": "webpack-dev-server"
   }
  but it didn't work.</p>
  
  <p>this is my code:
  App.js</p>
  
  <pre><code>const http = require('http');
  
  const hostname = '127.0.0.1';
  const port = 3000;
  
  const server = http.createServer((req, res) =&gt; {
    res.statusCode = 200;
    res.setHeader('Content-Type', 'text/plain');
    res.end('Hello World\n');
  });
  
  server.listen(port, hostname, () =&gt; {
    console.log(`Server running at http://${hostname}:${port}/`);
  });
  </code></pre>
  
  <p>package.json</p>
  
  <pre><code>{
    "name": "codlab-nodejs",
    "version": "1.0.0",
    "description": "",
    "main": "index.js",
    "scripts": {
      "start": "node js"
    },
    "author": "",
    "license": "ISC"
  }
  </code></pre>
  
  <p>package-lock.json</p>
  
  <pre><code>{
    "name": "codlab-nodejs",
    "version": "1.0.0",
    "lockfileVersion": 1
  }
  
  </code></pre>
  
  <p>This is the err msg.</p>
  
  <pre><code>C:\Users\김동희\codlab-nodejs&gt;npm start
  
  &gt; codlab-nodejs@1.0.0 start C:\Users\김동희\codlab-nodejs
  &gt; node js
  
  internal/modules/cjs/loader.js:638
      throw err;
      ^
  
  Error: Cannot find module 'C:\Users\김동희\codlab-nodejs\js'
      at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
      at Function.Module._load (internal/modules/cjs/loader.js:562:25)
      at Function.Module.runMain (internal/modules/cjs/loader.js:829:12)
      at startup (internal/bootstrap/node.js:283:19)
      at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! codlab-nodejs@1.0.0 start: `node js`
  npm ERR! Exit status 1
  npm ERR!
  npm ERR! Failed at the codlab-nodejs@1.0.0 start script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  npm WARN Local package.json exists, but node_modules missing, did you mean to install?
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     C:\Users\김동희\AppData\Roaming\npm-cache\_logs\2019-08-03T14_03_42_211Z-debug.log
  </code></pre>