Assuming you haven’t set TEMPLATE_CONTEXT_PROCESSORS to some other value in settings.py, Django will automatically load the debug context preprocessor (as noted here). This means that you will have access to a variable called debug in your templates if settings.DEBUG is true and your local machine’s IP address (which can simply be 127.0.0.1) is set in the variable settings.INTERNAL_IPS (which is described here). settings.INTERNAL_IPS is a tuple or list of IP addresses that Django should recognize as “internal”.