README.md

etiket

Zero-dependency barcode & QR code generator — SVG & PNG output.
40+ formats, styled QR codes, tree-shakeable. Pure TypeScript, works everywhere.

Quick Start

npm install etiket

import { barcode, qrcode } from "etiket"

const svg = barcode("Hello World")
const qr = qrcode("https://example.com", { dotType: "dots", ecLevel: "H" })

CLI

npx etiket list                       # every supported symbology
npx etiket qr "Hello World" -o qr.svg
npx etiket qr "Hello" --terminal
npx etiket qr "Hello" --size 300 --ec H --dot-type dots
npx etiket qr "Hello" -o qr.png       # .png output writes a PNG
npx etiket barcode "4006381333931" --type ean13 --show-text -o barcode.svg
npx etiket postal "SN34RD1A" --type rm4scc -o postal.svg
npx etiket datamatrix "Hello" -o dm.svg
npx etiket pdf417 "Hello" -o pdf.svg
npx etiket aztec "Hello" -o aztec.svg
npx etiket maxicode "Hello" -o maxi.svg
npx etiket wifi "MyNetwork" "secret123" -o wifi.svg
npx etiket contact "Ada Lovelace" --email ada@example.com -o card.svg

Every symbology has a subcommand (qr, microqr, rmqr, barcode, postal, datamatrix, pdf417, micropdf417, aztec, maxicode, dotcode, hanxin, codablockf, code16k, jabcode) plus the wifi, contact and link helpers. Add --png or use a .png output path for raster output.

Tree Shaking

Import only what you need:

import { barcode, barcodeDataURI, barcodeBase64 } from "etiket/barcode"
import { postal, encodePostal } from "etiket/postal"
import { qrcode, qrcodeDataURI, qrcodeBase64, qrcodeTerminal, microqr, rmqr } from "etiket/qr"
import { datamatrix, gs1datamatrix } from "etiket/datamatrix"
import { pdf417, micropdf417 } from "etiket/pdf417"
import { aztec } from "etiket/aztec"
import { maxicode, dotcode, hanxin, codablockf, code16k } from "etiket/2d"
import { barcodePNG, qrcodePNG, postalPNG } from "etiket/png" // PNG output
import { validateBarcode, validateQRInput } from "etiket/validators"
import { EtiketError, InvalidInputError, CapacityError } from "etiket/errors"

Supported Formats

1D Barcodes

Format	Type	Description
Code 128	code128	Auto charset (A/B/C)
Code 39	code39	43-char set, optional check
Code 39 Ext	code39ext	Full ASCII
Code 93	code93	Higher density, 2 check digits
Code 93 Ext	code93ext	Full ASCII
EAN-13	ean13	Auto check digit
EAN-8	ean8	Auto check digit
EAN-5	ean5	Addon (book price)
EAN-2	ean2	Addon (issue number)
UPC-A	upca	12-digit, auto check digit
UPC-E	upce	Compressed 8-digit
ITF	itf	Interleaved 2 of 5
ITF-14	itf14	14-digit with bearer bars
Codabar	codabar	Libraries, blood banks
MSI Plessey	msi	Mod10/11/1010/1110
Pharmacode	pharmacode	Pharmaceutical
Code 11	code11	Telecommunications
GS1-128	gs1-128	AI parsing, FNC1, 100+ AIs
GS1 DataBar	gs1-databar	Omnidirectional, 14-digit GTIN
GS1 DataBar Limited	gs1-databar-limited	GTIN starting with 0/1
GS1 DataBar Expanded	gs1-databar-expanded	Variable-length AI data
Identcode	identcode	Deutsche Post / DHL
Leitcode	leitcode	Deutsche Post routing
POSTNET	postnet	USPS legacy postal
PLANET	planet	USPS confirmation tracking
Plessey	plessey	UK library systems
GS1 DataBar Truncated	gs1-databar-truncated	Short-height omnidirectional
EAN-14	ean14	GTIN-14 as a GS1-128, AI (01)
SSCC-18	sscc18	Shipping container, AI (00)
ISBN	isbn	ISBN-10 or ISBN-13, over EAN-13
ISSN	issn	Serials, with sequence variant
ISMN	ismn	Printed music, 9790 prefix
Code 32	code32	Italian Pharmacode, over Code 39
PZN-7 / PZN-8	pzn / pzn8	German pharmaceutical number

2D Codes

Format	Function	Description
QR Code	qrcode()	Versions 1-40, all EC levels, all modes
Micro QR	microqr()	M1-M4 (11x11 to 17x17)
Data Matrix	datamatrix()	ECC 200, ASCII/C40/Text auto encoding
GS1 DataMatrix	gs1datamatrix()	FNC1 + AI parsing
PDF417	pdf417()	Text/Byte/Numeric, 9 EC levels, ISO-8859-15
MicroPDF417	micropdf417()	Compact PDF417 for small items
Aztec	aztec()	Compact + full-range, no quiet zone
MaxiCode	`maxicode()$	33 \times 30 \text{hexagonal}, \text{UPS} \text{shipping} \text{labels}
\text{rMQR}	$rmqr()`	Rectangular Micro QR (R7x43 to R17x139)
Codablock F	codablockf()	Stacked Code 128
Code 16K	code16k()	Stacked barcode, 2-16 rows
DotCode	dotcode()	Checkerboard dots, high-speed printing
Han Xin	hanxin()	Chinese market, 84 versions, 4 finders
JAB Code	jabcode()	Polychrome (4/8 color), ISO/IEC 23634

Each also has a raw encoder (encodeMicroQR, encodeMaxiCode, …) and, except for JAB Code, a *PNG() variant.

Postal Barcodes

Postal symbologies are height-modulated — the data lives in each bar's vertical extent, not its width — so they have their own encoder and renderer.

Format	type	Description
POSTNET	postnet	USPS ZIP (5, 9 or 11 digits)
PLANET	planet	USPS PLANET (11 or 13 digits)
RM4SCC	rm4scc	Royal Mail (UK)
KIX	kix	PostNL (Netherlands)
Australia Post	auspost	Australia Post
Japan Post	jppost	Japan Post (Kasutama)
USPS IMb	imb	Intelligent Mail (US)

import { postal, encodePostal, postalPNG } from "etiket"

postal("12345-6789", { type: "postnet" }) // SVG
postal("SN34RD1A", { type: "rm4scc" })
postal("12345678", { type: "auspost", fcc: "59" })
postal("01234567094987654321", { type: "imb", routingCode: "01234567891" })

postalPNG("12345", { type: "postnet" }) // Uint8Array

// Raw bar states: 'T' | 'A' | 'D' | 'F' (4-state), or 1 / 0 (POSTNET, PLANET)
const bars = encodePostal("SN34RD1A", { type: "rm4scc" })

barcode() accepts postnet and planet and routes them to the postal renderer automatically. The per-format raw encoders (encodeRM4SCC, encodeKIX, encodeAustraliaPost, encodeJapanPost, encodeIMb, encodePOSTNET, encodePLANET) remain available.

Usage

Barcodes

import { barcode } from "etiket"

barcode("Hello World") // Code 128 (default)
barcode("4006381333931", { type: "ean13", showText: true })
barcode("00012345678905", { type: "itf14", bearerBars: true })
barcode("(01)12345678901234(17)260101", { type: "gs1-128" })
barcode("HELLO", { type: "code39", code39CheckDigit: true })

Option	Type	Default	Description
type	BarcodeType	'code128'	Barcode format
height	number	80	Bar height in pixels
barWidth	number	2	Width multiplier per module
color	string	'#000'	Bar color
background	string	'#fff'	Background color
showText	boolean	false	Show human-readable text
textPosition	'bottom' | 'top'	'bottom'	Text position
fontSize	number	14	Text font size
fontFamily	string	'monospace'	Text font family
margin	number	10	Margin around barcode
marginTop	number	margin	Top margin
marginBottom	number	margin	Bottom margin
marginLeft	number	margin	Left margin
marginRight	number	margin	Right margin
textAlign	'center' | 'left' | 'right'	'center'	Text alignment
rotation	0 | 90 | 180 | 270	0	Barcode rotation
bearerBars	boolean	false	Bearer bars (ITF-14)
barGap	number	0	Extra spacing between bars
unit	'px' | 'mm' | 'in' | 'cm'	'px'	Measurement unit
ariaLabel	string	—	SVG aria-label attribute
title	string	—	SVG <title> element
desc	string	—	SVG <desc> element

QR Codes

import { qrcode } from "etiket"

qrcode("https://example.com")
qrcode("Hello", { size: 300, ecLevel: "H", dotType: "rounded" })

// With gradient
qrcode("Test", {
  color: {
    type: "linear",
    rotation: 45,
    stops: [
      { offset: 0, color: "#ff0000" },
      { offset: 1, color: "#0000ff" },
    ],
  },
})

// With corner styling
qrcode("Test", {
  dotType: "dots",
  corners: {
    topLeft: { outerShape: "rounded", innerShape: "dots", outerColor: "#ff0000" },
    topRight: { outerShape: "extra-rounded" },
    bottomLeft: { outerShape: "dots" },
  },
})

Option	Type	Default	Description
size	number	200	SVG size in pixels
ecLevel	'L' | 'M' | 'Q' | 'H'	'M'	Error correction level
version	number	auto	QR version (1-40)
mode	'numeric' | 'alphanumeric' | 'byte' | 'auto'	'auto'	Encoding mode
mask	0-7	auto	Mask pattern
color	string | GradientOptions	'#000'	Module color
background	string | GradientOptions	'#fff'	Background color
margin	number	4	Quiet zone in modules
dotType	DotType	'square'	Module shape
dotSize	number	1	Module size (0.1-1)
shape	'square' | 'circle'	'square'	Overall QR shape
corners	object	—	Finder pattern styling
logo	LogoOptions	—	Center logo embedding
xmlDeclaration	boolean	false	Add XML declaration
unit	'px' | 'mm' | 'in' | 'cm'	'px'	Measurement unit
ariaLabel	string	—	SVG aria-label
title	string	—	SVG <title> element
desc	string	—	SVG <desc> element

Dot types: square, rounded, dots, diamond, classy, classy-rounded, extra-rounded, vertical-line, horizontal-line, small-square, tiny-square

2D Codes

Every 2D, stacked and polychrome symbology has a high-level function returning SVG:

import {
  datamatrix,
  gs1datamatrix,
  pdf417,
  micropdf417,
  aztec,
  microqr,
  rmqr,
  maxicode,
  dotcode,
  hanxin,
  codablockf,
  code16k,
  jabcode,
} from "etiket"

datamatrix("Hello World")
gs1datamatrix("(01)12345678901231")
pdf417("Hello World", { ecLevel: 4, columns: 5 })
micropdf417("Hello", { columns: 2 })
aztec("Hello World", { ecPercent: 33 })

microqr("12345", { version: 3 })
rmqr("Hello", { ecLevel: "H" })
maxicode("Hello", { mode: 2, postalCode: "123456789", countryCode: 840 })
dotcode("Hello")
hanxin("Hello", { ecLevel: 3 })

// Stacked linear symbologies (rows taller than modules are wide)
codablockf("Hello World", { columns: 8 })
code16k("Hello World")

// Polychrome
jabcode("Hello", { colors: 8 })

Output Formats

import {
  barcode,
  qrcode,
  barcodeDataURI,
  qrcodeDataURI,
  barcodeBase64,
  qrcodeBase64,
  qrcodeTerminal,
  barcodePNG,
  qrcodePNG,
  barcodePNGDataURI,
  qrcodePNGDataURI,
} from "etiket"

// SVG
const svg = qrcode("Hello") // SVG string
const uri = qrcodeDataURI("Hello") // data:image/svg+xml,...
const b64 = qrcodeBase64("Hello") // data:image/svg+xml;base64,...
const term = qrcodeTerminal("Hello") // Terminal (UTF-8 blocks)

// PNG (zero-dependency raster output — no canvas, no native deps)
const png = qrcodePNG("Hello") // Uint8Array
const pngUri = qrcodePNGDataURI("Hello") // data:image/png;base64,...
const barPng = barcodePNG("12345", { type: "code128" }) // Uint8Array

PNG output is available for every format except JAB Code, each with a matching *PNGDataURI variant:

barcodePNG, postalPNG, qrcodePNG, microqrPNG, rmqrPNG, datamatrixPNG, gs1datamatrixPNG, pdf417PNG, micropdf417PNG, aztecPNG, maxicodePNG, dotcodePNG, hanxinPNG, codablockfPNG, code16kPNG.

Raw Encoding

encode() returns the underlying data for any symbology without rendering:

import { encode } from "etiket"

const result = encode("Hello", { type: "qr", qr: { ecLevel: "H" } })

if (result.type === "1d")
  result.bars // bar/space widths
else if (result.type === "2d")
  result.matrix // boolean[][]
else result.bars // postal bar states

Convenience Helpers

import { wifi, email, sms, geo, url, phone, vcard, mecard, event } from "etiket"

wifi("MyNetwork", "password123") // WiFi QR
email("test@example.com") // mailto: QR
sms("+1234567890", "Hello!") // SMS QR
geo(37.7749, -122.4194) // Location QR
url("https://example.com") // URL QR
phone("+1234567890") // tel: QR

// vCard QR
vcard({
  firstName: "John",
  lastName: "Doe",
  phone: "+1234567890",
  email: "john@example.com",
  org: "Acme Inc",
})

// MeCard QR (simpler, used by Android)
mecard({ name: "John Doe", phone: "+1234567890", email: "john@example.com" })

// Calendar event QR
event({
  title: "Meeting",
  start: "2026-04-01T10:00:00",
  end: "2026-04-01T11:00:00",
  location: "Office",
})

Batch Generation

import { barcodes, barcodeSheet, qrcodeSheet } from "etiket"

// Many symbols, one call, shared options
const labels = barcodes(["SKU-001", "SKU-002", "SKU-003"], {
  type: "code128",
  height: 50,
})

// Or a single SVG document holding a grid of them — a label sheet
const sheet = barcodeSheet(
  orders.map((o) => o.tracking),
  {
    type: "code128",
    columns: 3,
    gap: 12,
    labels: orders.map((o) => o.reference),
  },
)

// Progress on a long batch
qrcodeSheet(tickets, { columns: 4, onProgress: (done, total) => bar.update(done / total) })

Validation

import { validateBarcode, isValidInput, validateQRInput } from "etiket"

validateBarcode("4006381333931", "ean13") // { valid: true }
validateBarcode("ABC", "ean13") // { valid: false, error: '...' }
isValidInput("HELLO", "code39") // true

Swiss QR Code

Generate QR-bill payment codes (mandatory in Switzerland since 2022):

import { swissQR } from "etiket"

swissQR({
  iban: "CH4431999123000889012",
  creditor: { name: "Max Muster", postalCode: "8000", city: "Zürich", country: "CH" },
  amount: 1949.75,
  currency: "CHF",
  reference: "210000000003139471430009017",
  referenceType: "QRR",
})

Raw Encoders

Access encoding functions directly for custom rendering:

import {
  encodeCode128,
  encodeEAN13,
  encodeQR,
  encodeDataMatrix,
  encodePDF417,
  encodeAztec,
  renderBarcodeSVG,
  renderQRCodeSVG,
  renderMatrixSVG,
  renderBarcodePNG,
  renderMatrixPNG,
} from "etiket"

const bars = encodeCode128("data") // number[] (bar/space widths)
const matrix = encodeQR("data") // boolean[][] (QR matrix)
const dm = encodeDataMatrix("data") // boolean[][] (Data Matrix)

// SVG rendering
const svg = renderBarcodeSVG(bars, { height: 100 })
const qrSvg = renderQRCodeSVG(matrix, { size: 400, dotType: "dots" })

// PNG rendering
const png = renderBarcodePNG(bars, { height: 100, scale: 2 })
const qrPng = renderMatrixPNG(matrix, { moduleSize: 10, margin: 4 })

Industry Standards

import {
  swissQR,
  gs1datamatrix,
  gs1DigitalLink,
  encodeHIBCPrimary,
  encodeHIBCSecondary,
} from "etiket"

// Swiss QR-bill (mandatory in Switzerland since 2022)
swissQR({
  iban: "CH4431999123000889012",
  creditor: { name: "Max Muster", postalCode: "8000", city: "Zürich", country: "CH" },
  amount: 1949.75,
  currency: "CHF",
})

// GS1 DataMatrix (healthcare, supply chain)
gs1datamatrix("(01)12345678901234(17)260101(10)BATCH01")

// GS1 Digital Link (2027 retail migration)
gs1DigitalLink({ gtin: "09520123456788", batch: "ABC123", serial: "12345" })

// HIBC (medical device labeling, FDA UDI)
const hibc = encodeHIBCPrimary("A123", "PROD456")
barcode(hibc, { type: "code128" }) // Encode in any symbology

// ISBT 128 (blood bank labeling, ISO 7064 Mod 37-2 check character)
const din = encodeISBT128DIN("US", "12345", "26", "000001")
barcode(din, { type: "code128" })

// MaxiCode (UPS shipping labels)
const mc = encodeMaxiCode("Test shipment", {
  mode: 2,
  postalCode: "12345",
  countryCode: 840,
  serviceClass: 1,
})

SVG Accessibility

All SVG renderers support accessibility attributes out of the box:

barcode("123456789", {
  type: "ean13",
  ariaLabel: "EAN-13 barcode for product 123456789",
  title: "Product Barcode",
  desc: "EAN-13 barcode encoding the GTIN 123456789",
})

qrcode("https://example.com", {
  ariaLabel: "QR code linking to example.com",
  title: "Website QR Code",
})

// CSS currentColor support for theme-aware barcodes
barcode("HELLO", { color: "currentColor", background: "transparent" })

Framework Integration

etiket generates plain SVG strings — no DOM required. Works with any framework:

React / Next.js

import { qrcode } from "etiket"

function QRCode({ url }: { url: string }) {
  const svg = qrcode(url, {
    size: 200,
    dotType: "dots",
    ecLevel: "H",
    corners: {
      topLeft: { outerShape: "dots", innerShape: "dots", outerColor: "#ff0000" },
      topRight: { outerShape: "dots", innerShape: "dots" },
      bottomLeft: { outerShape: "dots", innerShape: "dots" },
    },
  })

  return <div dangerouslySetInnerHTML={{ __html: svg }} />
}

Or use a data URI for <img>:

import { qrcodeDataURI } from "etiket"

function QRImage({ url }: { url: string }) {
  return <img src={qrcodeDataURI(url)} alt="QR Code" width={200} height={200} />
}

PNG output (useful for downloads or <canvas>):

import { qrcodePNGDataURI } from "etiket/png"

function QRCodePNG({ url }: { url: string }) {
  return <img src={qrcodePNGDataURI(url, { size: 200 })} alt="QR Code" width={200} height={200} />
}

Note: qrcode() is a pure function with zero DOM dependencies — it works in both Server Components (RSC) and Client Components.

Vue

<script setup lang="ts">
import { qrcode } from "etiket"

const props = defineProps<{ url: string }>()
const svg = computed(() => qrcode(props.url, { dotType: "dots", ecLevel: "H" }))
</script>

<template>
  <div v-html="svg" />
</template>

Svelte

<script lang="ts">
  import { qrcode } from "etiket";

  let { url }: { url: string } = $props();
  let svg = $derived(qrcode(url, { dotType: "dots", ecLevel: "H" }));
</script>

{@html svg}

Angular

import { Component, Input } from "@angular/core"
import { DomSanitizer, SafeHtml } from "@angular/platform-browser"
import { qrcode } from "etiket"

@Component({
  selector: "app-qrcode",
  template: `<div [innerHTML]="svg"></div>`,
})
export class QRCodeComponent {
  svg: SafeHtml = ""

  @Input() set url(value: string) {
    this.svg = this.sanitizer.bypassSecurityTrustHtml(
      qrcode(value, { dotType: "dots", ecLevel: "H" }),
    )
  }

  constructor(private sanitizer: DomSanitizer) {}
}

Astro

---
import { qrcode } from "etiket";

const svg = qrcode("https://example.com", { dotType: "dots", ecLevel: "H" });
---

<Fragment set:html={svg} />

Features

• Zero dependencies
• Pure ESM, edge-runtime compatible (Cloudflare Workers, Deno, Bun)
• TypeScript-first with strict types (TypeScript 7)
• Tree-shakeable sub-path exports
• CLI tool (npx etiket)
• SVG string output (no DOM required) + optimizeSVG() for compact inline
• PNG raster output (pure JS, zero dependencies) via etiket/png
• SVG accessibility (ariaLabel, role, title, desc)
• Measurement units (px, mm, in, cm, pt) for print use cases
• CSS currentColor support for theme-aware barcodes
• Auto EC upgrade to H when QR logo is present (supports PNG, JPEG, SVG, ICO)
• GS1 support (100+ AIs, Digital Link, GS1 QR, GS1 DataMatrix, the full GS1 DataBar family including the stacked variants)
• ECI on QR, Data Matrix, PDF417 and Aztec — non-Latin-1 data is declared, not truncated
• QR kanji mode with the real Shift-JIS table, Structured Append across up to 16 symbols, and optimal multi-segment encoding
• Batch generation and label sheets (barcodes(), qrcodeSheet())
• HIBC medical device encoding + ISBT 128 blood bank labeling
• Swiss QR-bill payments
• 4-state postal barcodes (RM4SCC, KIX, Australia Post, Japan Post, USPS IMb)
• Works in browser, Node.js, Deno, Bun, Cloudflare Workers

Verification

Producing a symbol is easy; producing one a scanner accepts is not. Every symbology here is checked against something that is not this library:

• Decoded back with zxing-wasm or jsQR — QR, Micro QR, rMQR, Data Matrix, PDF417, MicroPDF417, Aztec, MaxiCode, Code 128, EAN, UPC, Code 39, Code 93, ITF, Codabar, GS1-128 and every GS1 DataBar variant.
• Compared module for module with bwip-js (BWIPP) for the formats no JavaScript decoder implements — Code 16K, Codablock F, DotCode, Han Xin, MSI, Plessey, Code 11, Pharmacode, Identcode, Leitcode, HIBC, POSTNET, PLANET, RM4SCC, KIX, Australia Post, Japan Post, USPS IMb, and every GS1 Composite symbol from its linkage flag to its separator pattern.
• JAB Code is the exception, and says so in its own API docs: no JavaScript or WebAssembly decoder exists and neither zxing nor BWIPP implements it, so its output cannot be verified and is marked experimental.

test/bwip-compare.test.ts keeps the differences visible rather than asserting them away: a format that diverges is listed with the issue tracking it, and the test turns red the moment it starts matching.

Comparison

Feature	etiket	uqr	bwip-js	JsBarcode	qr-code-styling
Zero dependencies	:white_check_mark:	:white_check_mark:	:x: (1.5MB+)	:x: (xmldom)	:x: (qrcode)
TypeScript-first	:white_check_mark:	:white_check_mark:	:x:	:x:	Partial
Tree-shakeable	:white_check_mark:	:x:	:x:	:x:	:x:
1D barcodes (40 types)	:white_check_mark:	:x:	:white_check_mark: (100+)	:white_check_mark: (13)	:x:
QR Code (v1-40, all EC)	:white_check_mark:	:white_check_mark:	:white_check_mark:	:x:	:white_check_mark:
Data Matrix	:white_check_mark:	:x:	:white_check_mark:	:x:	:x:
PDF417	:white_check_mark:	:x:	:white_check_mark:	:x:	:x:
Aztec Code	:white_check_mark:	:x:	:white_check_mark:	:x:	:x:
QR dot styling (12 types)	:white_check_mark:	:x:	:x:	:x:	:white_check_mark:
QR gradients	:white_check_mark:	:x:	:x:	:x:	:white_check_mark:
QR corner styling	:white_check_mark:	:x:	:x:	:x:	:white_check_mark:
QR logo embedding	:white_check_mark:	:x:	:x:	:x:	:white_check_mark:
CLI tool	:white_check_mark:	:x:	:white_check_mark:	:x:	:x:
Terminal output	:white_check_mark:	:white_check_mark:	:x:	:x:	:x:
Convenience helpers (WiFi, vCard...)	:white_check_mark:	:x:	:x:	:x:	:x:
Input validation	:white_check_mark:	:x:	:x:	:x:	:x:
SVG output	:white_check_mark:	:white_check_mark:	:white_check_mark:	:white_check_mark:	:white_check_mark:
PNG output	:white_check_mark:	:x:	:white_check_mark:	:white_check_mark:	:white_check_mark:
Pure ESM	:white_check_mark:	:white_check_mark:	:x: (CJS)	:x: (CJS)	:x: (CJS)
Bundle size (gzip)	~24KB	~12KB	~160KB	~15KB	~30KB+deps

etiket is the only library that combines 1D barcodes + 2D codes + styled QR codes + SVG & PNG output + zero dependencies + tree-shaking in a single package.

Inspiration & Credits

Built from scratch, inspired by these excellent libraries:

• uqr — Pure SVG QR approach, terminal rendering
• bwip-js — Comprehensive barcode format reference (100+ types)
• JsBarcode — Encoding table validation, barcode rendering patterns
• qr-code-styling — QR styling concepts (dot types, gradients, corners, logos)

Standards: ISO/IEC 15417 (Code 128), ISO/IEC 15420 (EAN/UPC), ISO/IEC 18004 (QR), ISO/IEC 16022 (Data Matrix), ISO/IEC 15438 (PDF417), ISO/IEC 24778 (Aztec), ISO/IEC 24724 (GS1 DataBar), ISO/IEC 16023 (MaxiCode), ISO/IEC 23941 (rMQR), ISO/IEC 20830 (Han Xin), ISO/IEC 23634 (JAB Code), AIM ISS DotCode 4.0 (DotCode), USPS-B-3200 (IMb).

Contributing

Contributions are welcome! Here are some areas where help is especially appreciated:

Where help would go furthest:

• JAB Code — full LDPC error correction per ISO/IEC 23634. The one symbology here that cannot be verified against anything, because no decoder and no reference encoder implements it.
• Han Xin GB 18030 Chinese modes — byte mode carries Chinese text today. BWIPP's own Han Xin encoder implements Numeric and Byte and no more, so adding the Chinese modes means finding something that can check them first.
• Telepen and Channel Code — neither has a decoder, and neither yields to a rule: Telepen's 128 character table is reproduced by no deterministic tokenizer or small state machine we could find, and Channel Code's construction is an enumeration. Copying the reference's tables and then comparing against the reference is not verification.
• Code 49, Code One, Ultracode — implementable and comparable against BWIPP, just not written yet.

Also welcome:

• More payloads for test/encoders-random-differential.test.ts, which is where a mis-taken branch shows up
• Documentation improvements

pnpm install    # Install dependencies
pnpm dev        # Run tests in watch mode
pnpm test       # Lint + typecheck + test
pnpm build      # Build for production

License

Published under the MIT license.