Debug in Joomla 4 is very powerful and important when it comes to figuring out what’s going on with blank pages and or other errors within your Joomla site.
Here steps how to do:
- To enable error reporting: Navigate to System >> Global Configuration.
- Inside the Global Configuration screen, click the Server tab. And then change error reporting to Maximum (your current value might be System Default or none).
- Inside the Global Configuration screen, click System tab and enable debug system option
- Once done, hit Save.
This is very useful for PHP fatal errors where Joomla isn’t able to run at all and you have to fix beforehand in order to even see the Joomla screen working.
Sometimes, you may start experiencing blank or broken pages after installing an extension or upgrading/downgrading PHP version on your server or some similar change, to debug errors like those the Joomla debug would be very very useful.