title: JavaScript how to check if a property is missing in a json
body: <p>i'm having some trouble in finding a way to check if in a parsed json object is present a property.
  For example  in my js i have this line of code:</p>
  
  <p><code>jsonArray = JSON.parse(jsonResponse)</code></p>
  
  <p>I wanna check if in the jsonArray object there is the property <code>media</code>.</p>
  
  <p>For example if my json look like this one:</p>
  
  <pre><code>Object0 {hashtags: Array[0], 
           symbols: Array[0],
           user_mentions: Array[1], 
           urls: Array[0]}
  Object1 {hashtags: Array[1], 
          symbols: Array[0], 
          user_mentions: Array[0],
          urls: Array[1], 
          media: Array[1]}
  </code></pre>
  
  <p>i wanna check if <code>Object0</code> has property <code>media</code> and if <code>Object1</code> has property <code>media</code>.</p>
  
  <p>Thank's</p>