title: Using psql how do I list extensions installed in a database?
body: <p>How do I list all extensions that are already installed in a database or schema from psql?</p>
  
  <p>See also</p>
  
  <ul>
  <li><a href="https://dba.stackexchange.com/questions/166283/where-can-i-find-a-list-of-the-extensions-for-postgresql">Finding a list of available extensions that PostgreSQL ships with</a></li>
  </ul>