Provide check digit algorithms and calculators written in Go

A C# library for validating and generating credit card numbers.

Generation and verification of card numbers using Luhn's algorithm.

A Java library for generating mathematically-valid credit card numbers for software testing. The API provides customizable criteria for generation, and is extensible to apply to any payment card type which uses Luhn validation (not limited to just credit cards).

A .net library to identify credit card number and cvv

🔒 An easy-to-use check digit library for data validation

This Python code scrapes Google search results then applies sentiment analysis, generates text summaries, and ranks keywords.

Minimal, zero-dependency implementation of the Luhn Algorithm for PHP.

Fake credit card generator and validator. This is only meant for educational purpose.

Simple validator for identification numbers based on the Luhn algorithm

Helper classes to calculate and validate ckecksums.

PHP implementation of the Luhn algorithm.

Luhn (Modulo 10 or mod 10 algorithm) for PHP

Pragmatic data validation

Contains helper classes that I find useful every now and then.

Fastest JavaScript implementation of the Luhn algorithm

A better and safer way to display your primary keys in urls or in your app

A set of check digit algorithms implemented in Dart

Core library

SIM card checksum and encoding utils for nibbling, mcc, mnc, etc.