Pure Elixir QR code encoding library.
Supports versions 1–20, error correction levels L/M/Q/H, and byte mode encoding. No external dependencies.
Usage
{:ok, matrix, size} = ExQR.encode("https://example.com")
{:ok, matrix, size} = ExQR.encode("Hello", :h)The matrix is a map of {row, col} => 0 | 1 where 1 = black module.
Converting to rows
rows = ExQR.matrix_to_rows(matrix, size)
# => [[0, 1, 1, ...], [1, 0, 0, ...], ...]Summary
Functions
@spec encode(String.t(), atom()) :: {:ok, map(), pos_integer()} | {:error, atom()}
Encode text into a QR code matrix.
Parameters
text— the string to encodelevel— error correction level::l,:m(default),:q, or:h
Returns
{:ok, matrix, size} or {:error, reason}.
Same as encode/2 but raises on error.
Convert a QR matrix to a list of lists (row-major).
Returns size rows, each with size values (0 or 1).