title: Manifest.json Unexpected Token
body: <p>Hello I pushed a react/express project up to heroku (<a href="https://polar-oasis-57801.herokuapp.com/" rel="noreferrer">https://polar-oasis-57801.herokuapp.com/</a>) and received the following errors in the console:
  <a href="https://i.stack.imgur.com/ZyMuL.png" rel="noreferrer">Chrome console error messages</a></p>
  
  <p>I tried looking up this error and it seems that I need to change something in my manifest.json file but I'm not sure. Any advice would help. Here's my manifest file:</p>
  
  <pre><code>{
    "short_name": "React App",
    "name": "Create React App Sample",
    "icons": [
      {
        "src": "favicon.ico",
        "sizes": "64x64 32x32 24x24 16x16",
        "type": "image/x-icon"
      }
    ],
    "start_url": ".",
    "display": "standalone",
    "theme_color": "#000000",
    "background_color": "#ffffff"
  }
  </code></pre>
  
  <p>And also my project on Github: <a href="https://github.com/bernar83/cat-cards" rel="noreferrer">https://github.com/bernar83/cat-cards</a></p>