title: How to access one key of JSON tree from Firebase Realtime Database?
body: <p>I want to get the value of 'caste' key from the JSON tree in Firebase Realtime Database.<a href="https://i.stack.imgur.com/scjqX.png" rel="nofollow noreferrer">See this image</a></p>
  
  <p>I have the user's unique ID and all my auth and user objects are in place. How do I get a reference to only the 'caste' key into a String variable?</p>
  
  <p>Thanks,
  <a href="https://i.stack.imgur.com/R6E0R.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/R6E0R.png" alt="PS: full tree "></a></p>