In the world of e-commerce and fintech, every failed transaction is lost revenue. One of the most common reasons for a failed transaction is a simple user error—a typo in the credit card number. However, not all errors are obvious. Some cards look valid but fail the mathematical checksum used by banks worldwide.
Cc Validator And Checker is a high-performance, open-source validation engine designed to instantly verify credit card numbers. It is not a payment gateway; it is a pre-validation tool. It checks the structural integrity of the card number before it ever hits your payment processor, reducing failed transactions and improving the user experience.
This repository provides a robust API, a command-line interface, and a sleek web interface. It uses the Luhn Algorithm (also known as the Modulus 10 algorithm) to mathematically validate the number. It also detects the card type (Visa, Mastercard, Amex, Discover) based on the Issuer Identification Number (IIN). It is the ultimate tool for developers building checkout pages, billing systems, or financial applications.
We have structured the validation process to ensure maximum accuracy and security.
Before performing any complex math, the tool runs a quick regex check. It strips away spaces and hyphens, and ensures the input contains only digits. It checks the length of the number (typically 13 to 19 digits). If the input is fundamentally invalid (e.g., contains letters or is too short), the tool returns an immediate error, saving compute resources.
This is the mathematical core. The Luhn algorithm is a checksum formula used to validate a variety of identification numbers. It works by doubling every second digit from the right, summing the digits of the results, and checking if the total sum is divisible by 10. If it is, the card number is structurally valid.
The first six digits of a card number are the Issuer Identification Number. Our tool uses a comprehensive database to map these digits to the specific card network (e.g., 4xxxxx is Visa, 5xxxxx is Mastercard, 34xxxx is Amex). It returns the card type along with the validation result, allowing your UI to display the correct brand logo dynamically.
| Feature | Description |
|---|---|
| Luhn Algorithm | Mathematically perfect validation of card checksums |
| Brand Detection | Instantly identifies Visa, Mastercard, Amex, and more |
| Bulk Validation | Validate entire CSV files of card numbers in seconds |
| REST API | A FastAPI backend to integrate validation into your app |
| Zero Storage | The tool never stores or logs card numbers, ensuring PCI compliance |
| Lightweight | Under 5MB installed, with zero external dependencies |
The Luhn algorithm is a great first line of defense, but it is not foolproof. A malicious user could generate a number that passes the Luhn check but doesn't actually belong to a real account.
That is why this tool goes beyond Luhn. We also implement BIN (Bank Identification Number) Lookup. If you provide an API key from a BIN database provider (like Binlist.net or Stripe), the tool can cross-reference the first six digits against the actual issuing bank. It can tell you if the card is a debit card, a credit card, or a prepaid card, and which country it was issued in.
This multi-layered approach drastically reduces fraud and ensures that only real, active card numbers are processed by your payment gateway.
Payment security is a constantly evolving challenge. If you have found a bug in the validation logic, improved the API performance, or want to add support for a new card network, we welcome your contributions!
- Fork the repository.
- Create your feature branch (
git checkout -b feature/new-network). - Commit your changes (
git commit -m 'Add new network'). - Push to the branch (
git push origin feature/new-network). - Open a Pull Request.
Please read our CONTRIBUTING.md for detailed coding standards and security guidelines. We also have an active Discord server where you can discuss PCI compliance, ask for help with API integration, and share your experiences in fintech development.
- 💬 Discussions: Join the conversation in the GitHub Discussions tab.
- 🐛 Issues: Found a bug? Let us know via the Issues tracker.
- 📧 Email: Reach out directly at support@cc-validator.dev.
