Installation — Django Debug Toolbar 3.2.4 documentation
Installation
Process
Each of the following steps needs to be configured for the Debug Toolbar to be fully functional.
1. Install the Package
The recommended way to install the Debug Toolbar is via pip:
$ python -m pip install django-debug-toolbar
If you aren’t familiar with pip, you may also obtain a copy of the debug_toolbar
directory and add it to your Python path.
To test an upcoming release, you can install the in-development version instead with the following command:
$ python -m pip install -e git+https://github.com/jazzband/django-debug-toolbar.git#egg=django-debug-toolbar
If you’re upgrading from a previous version, you should review the change log and look for specific upgrade instructions.
2. Check for Prerequisites
The Debug Toolbar requires two things from core Django. These are already configured in Django’s default startproject
template, so in most cases you will already have these set up.
First, ensure that 'django.contrib.staticfiles'
is in your INSTALLED_APPS
setting, and configured properly:
INSTALLED_APPS = [
# ...
"django.contrib.staticfiles",
# ...
]
STATIC_URL = "static/"
Second, ensure that your TEMPLATES
setting contains a DjangoTemplates
backend whose APP_DIRS
options is set to True
:
TEMPLATES = [
{
"BACKEND": "django.template.backends.django.DjangoTemplates",
"APP_DIRS": True,
# ...
}
]
3. Install the App
Add "debug_toolbar"
to your INSTALLED_APPS
setting:
INSTALLED_APPS = [
# ...
"debug_toolbar",
# ...
]
4. Add the URLs
Add django-debug-toolbar’s URLs to your project’s URLconf:
from django.urls import include, path
urlpatterns = [
# ...
path('__debug__/', include('debug_toolbar.urls')),
]
This example uses the __debug__
prefix, but you can use any prefix that doesn’t clash with your application’s URLs.
5. Add the Middleware
The Debug Toolbar is mostly implemented in a middleware. Add it to your MIDDLEWARE
setting:
MIDDLEWARE = [
# ...
"debug_toolbar.middleware.DebugToolbarMiddleware",
# ...
]
Warning
The order of MIDDLEWARE
is important. You should include the Debug Toolbar middleware as early as possible in the list. However, it must come after any other middleware that encodes the response’s content, such as GZipMiddleware.
6. Configure Internal IPs
The Debug Toolbar is shown only if your IP address is listed in Django’s :setting:`INTERNAL_IPS` setting. This means that for local development, you must add "127.0.0.1"
to :setting:`INTERNAL_IPS`. You’ll need to create this setting if it doesn’t already exist in your settings module:
INTERNAL_IPS = [
# ...
"127.0.0.1",
# ...
]
You can change the logic of determining whether or not the Debug Toolbar should be shown with the SHOW_TOOLBAR_CALLBACK option.
Warning
If using Docker the following will set your INTERNAL_IPS
correctly in Debug mode:
if DEBUG:
import os # only if you haven't already imported this
import socket # only if you haven't already imported this
hostname, _, ips = socket.gethostbyname_ex(socket.gethostname())
INTERNAL_IPS = [ip[:-1] + '1' for ip in ips] + ['127.0.0.1', '10.0.2.2']
Troubleshooting
On some platforms, the Django runserver
command may use incorrect content types for static assets. To guess content types, Django relies on the mimetypes module from the Python standard library, which itself relies on the underlying platform’s map files. If you find improper content types for certain files, it is most likely that the platform’s map files are incorrect or need to be updated. This can be achieved, for example, by installing or updating the mailcap
package on a Red Hat distribution, mime-support
on a Debian distribution, or by editing the keys under HKEY_CLASSES_ROOT
in the Windows registry.
Cross-Origin Request Blocked
The Debug Toolbar loads a JavaScript module. Typical local development using Django runserver
is not impacted. However, if your application server and static files server are at different origins, you may see CORS errors in your browser’s development console:
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost/static/debug_toolbar/js/toolbar.js. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).
Or
Access to script at 'http://localhost/static/debug_toolbar/js/toolbar.js' from origin 'http://localhost:8000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
To resolve, configure your static files server to add the Access-Control-Allow-Origin header with the origin of the application server. For example, if your application server is at http://example.com
, and your static files are served by NGINX, add:
add_header Access-Control-Allow-Origin http://example.com;
And for Apache:
Header add Access-Control-Allow-Origin http://example.com
Django Channels & Async
The Debug Toolbar currently doesn’t support Django Channels or async projects. If you are using Django channels are having issues getting panels to load, please review the documentation for the configuration option RENDER_PANELS.