To connect a Heroku instance to Chartio, you’ll need to retrieve the connection url from your Heroku account.
Log in the Heroku Postgres interface. You should see a list of your Apps. Click on the App that corresponds to your database—it will likely have the same name as your database.
Click on the Settings tab, then click Reveal config vars. Copy the value for DATABASE_URL, and paste it into a text editor. The url will be in the following format:
Copy the individual values (username, password, hostname, etc.) from the DATABASE_URL and paste them into the connection form in Chartio.
Heroku wisely enables PostgreSQL SSL connections by default. Every data connection Chartio makes is encrypted this way.