qr

Use qr for QR codes, simple barcode-like outputs, and saving generated codes as image files.

import "std:qr"

API reference

qr

Method	Returns	Notes
qr.generate(data: any, size: any, outputFile: any)	boolean	Writes a QR code to a PNG file.
qr.generateColored(data: any, size: any, colorArg: any, outputFile: any)	boolean	Uses the same payload/size normalization with a custom foreground color.
qr.generateToDataURL(data: any, size: any)	string	Uses the same normalized raster as a base64 PNG data URL.
qr.calculateModuleCount(data: string)	number
qr.generateQRMatrix(data: string, size: number)	[]array
qr.calculateModules(data: string)	array
qr.addFinderPatterns(matrix: []array)	void	Adds finder patterns.
qr.addAlignmentPatterns(matrix: []array)	void	Adds alignment patterns.
qr.addTimingPatterns(matrix: []array)	void	Adds timing patterns.
qr.addVersionInfo(matrix: []array)	void	Adds version info.
qr.getAlignmentPositions(size: number)	array	Returns alignment positions.
qr.shouldAvoidAlignment(x: number, y: number, size: number)	boolean	Reports whether a position overlaps a finder-pattern margin.
qr.generate128(data: any)	boolean	Validates data and writes a Code 128-style barcode PNG.
qr.generateEAN13(data: any)	boolean	Validates 12 digits and writes an EAN-13 barcode PNG.
qr.generateUPCA(data: any)	boolean	Validates 11 digits and writes a UPC-A barcode PNG.
qr.generateCode39(data: any)	boolean	Validates Code 39 characters and writes a barcode PNG.
qr.generateBarcode(data: any, length: any)	string	Generates a numeric barcode string of the requested length.
qr.generateSimpleBarcode(data: string)	string
qr.generateCode39Barcode(data: any)	string	Uppercases and validates Code 39 text before adding start/stop markers.
qr.calculateChecksum(data: string)	string
qr.verifyBarcode(data: any)	boolean	Verifies barcode.
qr.writeBarcode(barcode: string, data: any)	boolean	Writes barcode.
qr.scanBarcode(imagePath: any)	string
qr.getInfo(filePath: any)	object	Returns info.
qr.decode(imagePath: any)	string	Returns the current explicit not-implemented diagnostic.

Notes

• Prefer import "std:qr"; the older import "osl/qr" spelling remains supported.

Behavior and limits

QR payloads are limited to 2,953 bytes and generated images to 4,096 pixels per side. Barcode helpers reject invalid numeric input. PNG creation, encoding, and file-close errors are reported.