I Built a Flutter Package That Reads Credit Card Data via NFC — Here's How
A deep dive into building emv_nfc_reader , an open-source Flutter plugin that extracts card numbers, cardholder names, transaction history, and more from EMV chip cards using NFC. Have you ever wondered what data lives inside your credit card's chip? Beyond the card number printed on the front, EMV chips store a wealth of information — transaction counters, security flags, bank identifiers, and even a history of your recent purchases. I built emv_nfc_reader — an open-source Flutter plugin that lets you tap a physical credit card against your Android phone and extract all of this data in seconds. In this article, I'll walk you through what the package does, how it works under the hood, and how you can integrate it into your own Flutter project. 🔍 What Can You Actually Extract? When you tap a card, emv_nfc_reader returns a Map<String, String> containing over 20 data fields : Category Fields Card Identity PAN (Card Number), Expiry Date, PAN Seq...