Credit Card Validator

Credit card validation is essential for developers, e-commerce businesses, and payment processors. Developers use it for form validation, testing payment systems, and debugging payment flows. E-commerce businesses use it for customer checkout validation and fraud prevention. Payment processors use it for card verification and transaction processing. Our validator uses the Luhn algorithm with comprehensive card type detection, making it perfect for development, testing, e-commerce integration, and payment system validation.

Algorithm Steps: 1) Start from rightmost digit, double every second digit. 2) If doubled digit > 9, subtract 9. 3) Sum all digits. 4) If sum % 10 === 0, card is valid. Purpose: Catches common data entry errors. Limitations: Only checks format, not actual validity. History: Created by IBM scientist Hans Luhn in 1954. Used by: Most major credit card companies worldwide.

BIN (Bank Identification Number): First 6 digits identify issuing bank. Account Number: Digits 7-15 identify cardholder account. Check Digit: Last digit verifies number validity. Length: 13-19 digits depending on card type. Prefix: First digit(s) indicate card network. This structure allows for automated validation and routing of transactions.

PCI DSS: Payment Card Industry Data Security Standard compliance. Encryption: Always encrypt card data in storage and transmission. Tokenization: Replace card numbers with secure tokens. Validation: Never store raw card numbers unnecessarily. Testing: Use only test numbers in development environments. Logging: Never log full card numbers. These practices protect sensitive payment information.