Check if Payment Card is Mastercard or Visa Using JavaScript

When building payment gateways or forms, determining the type of payment card is essential for validation and user feedback. The most common card types are Mastercard and Visa, and you can identify them using their unique BIN (Bank Identification Number), which consists of the first few digits of the card number.

Identifying a payment card type (e.g., Visa, Mastercard) based on its number is a common task in web development, especially for e-commerce platforms. Here’s how you can check if payment card is mastercard or visa using JavaScript.

How to Identify Visa and Mastercard?

1. Visa Cards:
   • Start with the number 4.
   • Length: Typically 13 to 19 digits.
2. Mastercard Cards:
   • Start with numbers 51 through 55 or 2221 through 2720.
   • Length: Typically 16 digits.

Remove Leading Zeros in JavaScript

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Code Example

Here’s a simple JavaScript function to check if a card is Visa or Mastercard:

function getCardType(cardNumber) {
    const visaRegex = /^4[0-9]{12}(?:[0-9]{3})?$/; // Starts with 4
    const mastercardRegex = /^(?:5[1-5][0-9]{14}|2(?:2[2-9][0-9]{12}|[3-7][0-9]{13}))$/; // Starts with 51-55 or 2221-2720

    if (visaRegex.test(cardNumber)) {
        return "Visa";
    } else if (mastercardRegex.test(cardNumber)) {
        return "Mastercard";
    } else {
        return "Unknown or unsupported card type";
    }
}

// Usage
const cardNumber = "4111111111111111"; // Replace with user input
console.log(getCardType(cardNumber)); // Output: Visa

Why Validate?

• Improves UX: Displaying card type gives users confidence in the form.
• Reduces Errors: Catch unsupported card types early in the payment flow.
• Security: Helps avoid invalid submissions.

Conclusion

With JavaScript, you can efficiently check if payment card is mastercard or visa using JavaScript’s simple regex patterns. This validation step is an integral part of creating a seamless and secure payment process. Always combine client-side checks with server-side validations for robust security.