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Magnetic Track Parser is a Java library that can parse magnetic track data from a bank issued credit card, such as might be returned from a USB magnetic card stripe reader.

Magnetic Track Parser depends on the Credit Card Number library.

The goal of this project is to use publicly and freely available documentation to create a reliable Java library to provide information about credit cards.

Some resources consulted are:

• Magnetic stripe card on Wikipedia for information about the format of track data.

• All classes are immutable and thread-safe
• Secure data follows standards in the Java Cryptography Architecture (JCA) Reference Guide
• The standard toString() function formats data in a readable form
• Internationalization of card numbers is supported
• Validity is enforced by JUnit 5 tests
• Java 8 or newer is required
• Android friendly

You can download the jar on the Maven Central Repository. The download page has instructions on how to use the library in your Maven or Gradle build.

To parse a magnetic track, use code like:

BankCardMagneticTrack track = 
  BankCardMagneticTrack.from("%B5350290149345177^FATEHI/SUALEH^16042010000000000000000000000000000567001000?;5350290149345177=16042010000056700100?");
System.out.println(track);

and you will get this output:

TRACK 1: %B5350290149345177^FATEHI/SUALEH^16042010000000000000000000000000000567001000?
  Primary Account Number: 5350290149345177
  Name: Sualeh Fatehi
  Expiration Date: 2016-04
  Service Code: 201
  Discretionary Data: 0000000000000000000000000000567001000
TRACK 2: ;5350290149345177=16042010000056700100?
  Primary Account Number: 5350290149345177
  Expiration Date: 2016-04
  Service Code: 201
  Discretionary Data: 0000056700100
TRACK 3:  Not Available.

Bank Card Information: 
  Raw Account Number: 5350290149345177
  Primary Account Number: 5350290149345177
    Major Industry Identifier: 5 - Banking and financial
    Issuer Identification Number: 53502901
    Card Brand: MasterCard
    Last Four Digits: 5177
    Passes Luhn Check? Yes
    Is Primary Account Number Valid? Yes
  Name: Sualeh Fatehi
  Expiration Date: 2016-04
    Is Expired? Yes
  Service Code: 
    2 - Interchange: International interchange. Technology: Integrated circuit card.
    0 - Authorization Processing: Normal.
    1 - Allowed Services: No restrictions. PIN Requirements: None.

• Dmitry Holodov's excellent Android app, SwipeYours uses magnetictrackparser. See details in SetCardActivity.java. This Android app helps developers understand the new Android Host Card Emulation feature for payments, and is written with open source, in the same spirit as magnetictrackparser.