To activate debug mode in Magento 2, we will go to our files and edit the .htaccess file to uncomment the following line:

"SetEnv MAGE_MODE developer"

Once this is done, we will go to the errors directory and rename local.xml.sample to local.xml.

Now we will go to the app folder and modify the bootstrap.php file and uncomment the line with the following content:

"ini_set('display_errors', 1);"

Now we go to the Magento Backoffice and go to Store -> Configuration.

We look for Advanced -> Developer

In the Debug option, we will select Yes and save the configuration.

With this, we have already activated debug mode in Magento 2.