qrcode-core

QR code library in pure Haskell

https://github.com/alexkazik/qrcode#readme

LTS Haskell 22.44:0.9.10
Stackage Nightly 2026-10-28:0.9.12
Latest on Hackage:0.9.12

See all snapshots qrcode-core appears in

MIT licensed by ALeX Kazik
Maintained by [email protected]
This version can be pinned in stack with:qrcode-core-0.9.12@sha256:059420405a93715e6bcee3064c84cff41dd7dcc831e684c9d54c55fd61825bff,2513

Module documentation for 0.9.12

Used by 1 package in nightly-2026-10-28(full list with versions):
qrcode-juicypixels

qrcode

QR code library in pure Haskell

qrcode-core

Basic functionality to create a QRCode.

All modes are supported:

  • Numeric (digits only)
  • Alphanumeric (digits, letters and some other chars)
  • Binary / Text (ISO 8859-1 and UTF-8)
  • Kanji

There are function to create those specifically and an auto-detect.

The module Codec.QRCode has functions which creates an image out of the input.

The module Codec.QRCode.Intermediate has functions to create segments of a QRCode, join them together and finally create the image.

The core of the resulting image is an Vector of Bools, each element describing a module (“pixel”) where False is white and True is black.

thanks

Project Nayuki for https://github.com/nayuki/QR-Code-generator, which is the foundation of this package.

Changes

Changelog for qrcode-core

0.9.12 – 2026-10-27

  • Support for containers-0.8

0.9.11 – 2026-02-04

  • Support for bytestring-0.12
  • Support for containers-0.7

0.9.10 – 2024-09-29

  • Support for text-2.1

0.9.9 – 2023-10-10

  • Support for primitive-0.9

0.9.8 – 2023-04-30

  • Support for primitive-0.8

0.9.7 – 2023-04-23

  • Support for vector-0.13

0.9.6 – 2023-03-19

  • Support for text-2.0

0.9.5 – 2022-03-16

  • Support for bytestring-0.11

0.9.4 – 2020-07-19

  • Support for dlist-1.0

0.9.3 – 2020-04-27

  • Adapt to base-4.13

0.9.2 – 2019-12-19

  • Fix toMatrix

0.9.1 – 2019-05-23

  • Support for primitive 0.7

0.9.0 – 2019-02-16

  • Changed UTF-8 encoding: encoding a code point outside the unicode range will now fail the encoding, previously a replacement character was inserted
  • Removed a, internal only, partial function
  • Encoding empty data will result in an empty segment
  • Encoding an empty segment fails
  • Added functions to create an (non empty) segment without data
  • Remove StrictData

0.8.0 – 2019-01-09

  • Initial release