Debugging 

Rendering of Handlebars templates can be done with additional debugging. This results in individual tags being provided with debug output, which can be used to better localize errors, especially during development, and thus fix them more efficiently.

TypoScript 

# Disable debugging
config.debug = 0

# Enable debugging
config.debug = 1
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Local configuration 

// Disable debugging
$GLOBALS['TYPO3_CONF_VARS']['FE']['debug'] = false;

// Enable debugging
$GLOBALS['TYPO3_CONF_VARS']['FE']['debug'] = true;
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