💳 Generate and validate credit card information easily with this professional tool designed for secure testing and development purposes.

Aplicación web que permite a un usuario validar el número de una tarjeta de crédito y oculta todos los dígitos excepto los últimos cuatro.

Welcome to the UPI QR Generator! This slick React web application provides a user-friendly interface to input credit card details and a mobile number, validates the information, and then cleverly generates a UPI QR code or a direct UPI payment link.

E-commerce Bookstore android application

REST API that validates card numbers using the Luhn algorithm. Built with Node.js, TypeScript, and Express.

Card Validation en Super Cat, la pantalla muestra el registro y validación de tarjeta basándonos en el algoritmo de Luhn.

💳 Offline BIN database with 9,000+ verified entries. No API required! Fast SQLite lookup for credit/debit card validation.

REST API that validates card numbers using the Luhn algorithm and detects card type (Visa/Mastercard)

card-precheck is a lightweight JavaScript utility for validating credit and debit card numbers before sending them to a payment gateway.

A simple function that calculates the Luhn checksum for a given number