What is django-debug-toolbar?

Django Debug Toolbar is a developer companion that shows you detailed information about what's happening inside your web application while you're building it. Instead of wondering why a page is slow or what data is being passed around, you get a clickable panel on your website that reveals SQL queries, template rendering details, HTTP headers, settings, and more, right there in your browser. When you install it, a small toolbar appears at the top or side of your webpage during development. Click on any section and it expands to show you exactly what's going on. For example, you might discover that a page is running 50 database queries when it should only run 5, or see that a template variable isn't being passed the value you expected. The toolbar includes panels for viewing your Django version, request timing, all HTTP headers being sent, cookies and session data, the SQL queries executed and how long each took, signal broadcasts, and logging output from your application. The setup is straightforward: you add a middleware component (a piece of code that runs on every request) to your Django configuration, specify which panels you want to see, and set your local IP address as trusted. By default, it only shows up when you're accessing the site from your own machine with Django's debug mode enabled, it won't leak information on a live website. One bonus feature is a special command called debugsqlshell that you can run in Django's interactive shell. As you write Python code to query your database, it automatically prints out the exact SQL being executed, which helps you understand whether your ORM calls are efficient or if you're accidentally triggering extra database trips. You can customize almost everything: hide certain panels you don't need, intercept redirect responses so you can see debug info before the page changes, or write your own logic for when the toolbar should appear. It's designed by and for developers who want transparency into how their Django application actually behaves.