Boarding pass barcodes are in International Air Transport Association (IATA) Bar-Coded Boarding Pass (BCBP) format—a compact text string which can contain details for one or more flights for a given passenger.
I originally wrote a boarding pass parser on Flight Historian to allow me to import flights into my flight log from boarding passes. This version of the parser was implemented in Ruby on Rails
In 2026, I migrated the boarding pass parser from Flight Historian to this site. As Flight Historian was a Ruby on Rails application, and this is a static site, I had to re-implement the parser in JavaScript.