What is Django Debug Toolbar and what does it help you diagnose? Django Debug Toolbar क्या है और यह किस चीज़ का निदान करने में मदद करता है?

Django Debug Toolbar is a development-only panel injected into rendered pages that surfaces detailed diagnostic information about the request that produced the page — every SQL query executed (with duplicate/similar query detection), time spent in each phase of the request, template rendering context, cache operations, signal dispatches, and request/response headers.

It's most commonly used to catch N+1 query problems (a query panel showing dozens of near-identical queries is the classic symptom), identify slow middleware or views, and inspect the exact context passed to a template — all without needing to add temporary print statements or a debugger. It should never be enabled in production, both for security (it exposes internals) and performance (the extra instrumentation adds overhead).

# settings.py (development only)
INSTALLED_APPS += ['debug_toolbar']
MIDDLEWARE += ['debug_toolbar.middleware.DebugToolbarMiddleware']
INTERNAL_IPS = ['127.0.0.1']