title: Change JSON key names (to all capitalized) recursively?
body: <p>Is there a way to change all JSON key names to capital letter ?</p>
  
  <p>eg: </p>
  
  <pre><code>{"name":"john","Age":"21","sex":"male","place":{"state":"ca"}}
  </code></pre>
  
  <p>and need to be converted as</p>
  
  <pre><code>{"NAME":"john","AGE":"21","SEX":"male","PLACE":{"STATE":"ca"}}
  </code></pre>