title: I want to get the data from a firebase object how?
body: <p>Okay, am using firebase I tried some code from the docs that show me how to retrieve data from my DB. Am using the Web Docs Okay
  Here is what my DB looks like</p>
  
  <pre><code> MyApp-446464
   users
      foo
       -foobar
         first_name:"foo"
         last_name:"bar"
  
      bar
       -barfoo
         first_name:"bar"
         last_name:"foo"
  </code></pre>
  
  <p>So from the above, I get the object using </p>
  
  <pre><code>firebase.database().ref('users/').once('value').then(function(snapshot) {
     var username = snapshot.val();
  });
  </code></pre>
  
  <p>But the problem is I can't seem to get the value if I use </p>
  
  <pre><code>username.first_name;
  </code></pre>
  
  <p>its giving me undefined can someone assist me with what am doing wrong</p>