JS Error Reporting in under 200 bytes.
Think of it as Sentry Lite
Run the SQL queries in the migration.sql file, and then just load the JS file on your website.
You can configure your error reporting url by setting window._oof to a URL with the error collector - by default it is set to /error.php.
Oh and also you need PHP and MySQL. PHPmyadmin is not required, but it's recommended for viewing the reports.