title: Instagram get username from userId
body: <p>I have the ability to get userId from username, but I do not have the ability to get username from userId.</p>
  
  <p>I have a database of userId because that is all my app needed to function, but I want to know who these users are or look at their profiles. I have to otherwise update my app to write the username to the database in a new column, taking up space that the app itself doesn't really need</p>