title: Angular 4 - Get Value from JSON by Key
body: <p>I want to get the value by the key of this json. 
  The key is description and i want it in my console.log, i don't really get how to get this value, the filtering before worked fine. </p>
  
  <pre><code>{
      "id": "149",
      "description": "Try"
  }
  </code></pre>
  
  <p>Thanks!</p>