ImproperlyConfigured: Middleware not found in settings

ImproperlyConfigured: Middleware not found in settings

$ python manage.py runserver
...
ImportError: Could not import middleware 'myapp.middleware.Custom': Module not found

Why this happens

You listed a middleware path that doesn’t exist or has a typo, or the module isn’t importable.

Fix

Correct the dotted path and ensure the class is defined and importable.

Wrong code

MIDDLEWARE = [
    'myapp.middlewares.Custom',  # typo and wrong module
]

Fixed code

MIDDLEWARE = [
    'myapp.middleware.CustomMiddleware',
]

# myapp/middleware.py
class CustomMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response
    def __call__(self, request):
        return self.get_response(request)