Coupons — Django Coupon & Discount Code System

Author: Nitesh Kumar Singh · GitHub: @nkscoder

A reusable Django coupons app for managing promotional codes, discount rules, and coupon validation in Python web applications. Built by Nitesh Kumar Singh (nkscoder) for e-commerce, SaaS, and any Django project that needs flexible coupon functionality.

Keywords: django coupons · python coupon system · discount code · promo code · coupon validation · nkscoder · nitesh kumar singh

---

Features

• Percentage or fixed-amount discounts on any order total
• User-specific or global coupons — restrict codes to selected users or allow all
• Usage limits — max total uses, uses per user, or unlimited
• Expiration & active/inactive rules with datetime-based validity
• Django Admin integration with bulk actions (reset usage, delete expired)
• Simple validation API — one function call to check any coupon code
• Configurable coupon code length via DSC_COUPON_CODE_LENGTH setting

---

Requirements

• Python 3.8+
• Django 3.2+

---

Installation

From PyPI (recommended)

pip install coupons

From GitHub

pip install git+https://github.com/nkscoder/coupons.git

---

Setup

Step 1 — Add to INSTALLED_APPS

# settings.py
INSTALLED_APPS = [
    ...
    "coupons",
]

Step 2 — Run migrations

python manage.py migrate coupons

Step 3 — Create coupons in Django Admin

Go to /admin/ and create:

1. Discount — set value and type (percentage or fixed)
2. Allowed Users Rule — select users or enable "All users"
3. Max Uses Rule — set limits or enable infinite uses
4. Validity Rule — set expiration date and active status
5. Ruleset — link the three rules above
6. Coupon — assign discount and ruleset (code auto-generated)

Step 4 (optional) — Custom coupon code length

# settings.py
DSC_COUPON_CODE_LENGTH = 16  # default is 12

---

Usage

Validate a coupon

from coupons.validations import validate_coupon

coupon_code = "COUPONTEST01"
user = User.objects.get(username="nitesh")

status = validate_coupon(coupon_code=coupon_code, user=user)
# {'valid': True}

if status["valid"]:
    print("Coupon is valid!")
else:
    print(status["message"])  # e.g. "Coupon does not exist!"

Apply a coupon (record usage)

from coupons.models import Coupon

coupon = Coupon.objects.get(code=coupon_code)
coupon.use_coupon(user=user)

Get discount details

coupon = Coupon.objects.get(code=coupon_code)
discount = coupon.get_discount()
# {'value': 50, 'is_percentage': True}

Calculate discounted price

discounted = coupon.get_discounted_value(initial_value=100.0)
# Returns 50.0 for 50% off, or 80.0 for $20 off

---

Validation Rules

Rule	Description
Allowed Users	Coupon valid only for selected users, or all users
Max Uses	Global usage cap, per-user limit, or infinite
Validity	Active flag + expiration datetime

Invalid responses include a human-readable message key:

validate_coupon("DUMMYCODE", user)
# {'valid': False, 'message': 'Coupon does not exist!'}

---

REST API Example

See examples/ for a Django REST Framework integration sample (ajax_views.py, ajax_urls.py).

---

Development

git clone git@github.com:nkscoder/coupons.git
cd coupons
pip install -e ".[dev]"
python manage.py migrate
python manage.py runserver

Build & publish to PyPI

pip install build twine
python -m build
twine upload dist/*

Or tag a release on GitHub — the included GitHub Action publishes automatically.

---

Changelog

1.1.0

• Modernized for Django 3.2–5.x and Python 3.8+
• Added PyPI packaging (pyproject.toml)
• Fixed per-coupon usage validation bug
• Fixed template mutation in validation responses
• SEO & documentation update by Nitesh Kumar Singh (nkscoder)

1.0.0

• Initial release

---

Author & Links

Author	Nitesh Kumar Singh
GitHub	github.com/nkscoder
Repository	github.com/nkscoder/coupons
PyPI	pypi.org/project/coupons

---

License

MIT License — Copyright (c) 2020-2026 Nitesh Kumar Singh (nkscoder)