Styled QRCode

Generate a customizable styled QRCode worked in NodeJS/Browser with TypeScript supported.

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Installation

# Using npm
npm install sqrc

# Using yarn
yarn add sqrc

# Using pnpm
pnpm add sqrc

Usage

const qr = new QRCode('https://github.com/monodyle/sqrc')
qr.render() // image buffer

Options

ecLevel

• Type: ErrorCorrectionLevel (L | M | Q | H)
• Default: M

Error correction level

size

• Type: number
• Default: 150

Size (width and height) of the output render

quietZone

• Type: number
• Default: 10

The gap between image edge and QR code content

foreground

• Type: string | QRColorGradient (CSS color value string)
• Default: #000

Color of the foreground content

background

• Type: string | QRColorGradient (CSS color value string)
• Default: #fff

Color of the background image

moduleStyle

• Type: 'square' | 'dots' | 'rounded' | 'extraRounded' | 'classy'
• Default: squares

Style of the QR modules

moduleGap

• Type: number

Gap between QR modules (worked for moduleStyles with values: 'square' | 'dots')

logo.url

• Type: string

URL string of the logo in the center of QR

logo.width

• Type: number

Logo width

logo.height

• Type: number

Logo height

logo.padding

• Type: number

Padding around logo

logo.style

• Type: 'square' | 'circle'

Style of the QR padding

eyes.radius

• Type: QREyeCornerRadius | [QREyeCornerRadius, QREyeCornerRadius, QREyeCornerRadius]

The corner radius for the QR eyes

eyes.color

• Type: QREyeColor | [QREyeColor, QREyeColor, QREyeColor]

The color for the qr eyes

Eyes Type explaination

QREyesOptions is an object type that may have two properties: radius and color. Both properties can either take single values or an array of three values, each corresponding to a different "eye" of the QR code.

type QREyesOptions = {
  radius?:
    | QREyeCornerRadius
    | [QREyeCornerRadius, QREyeCornerRadius, QREyeCornerRadius]
  color?: QREyeColor | [QREyeColor, QREyeColor, QREyeColor]
}

type QREyeColor = string | QRInnerOuterEyeColor
type QRInnerOuterEyeColor = {
  inner: string
  outer: string
}

type QREyeCornerRadius =
  | number
  | [number, number, number, number]
  | QREyesInnerOuterRadius
type QREyesInnerOuterRadius = {
  inner: number | [number, number, number, number]
  outer: number | [number, number, number, number]
}

The eyes.radius property can take values of type QREyeCornerRadius, which determines the roundness of the 'eyes'. It can be a single number, an array of four numbers (in order: top-left, top-right, bottom-right, bottom-left), or an object with inner and outer properties, each being a number or an array of four numbers.

Same with the color property, it can take values of type QREyeColor, which determines the color of the eyes. It can be a string specifying a color or an object with inner and outer properties, each being a string specifying a color.

Example (output is the image on the right):

new QRCode('https://github.com/monodyle/sqrc', {
  size: 480,
  background: '#f2f1eb9f',
  foreground: '#3e3232',
  eyes: {
    radius: [
      [48, 48, 8, 48],
      {
        outer: [48, 8, 48, 8],
        inner: [0, 48, 0, 48]
      },
      { inner: 4, outer: 100 }
    ],
    color: [
      {
        inner: 'blueviolet',
        outer: 'indigo'
      },
      '#1a4d2e',
      {
        inner: '#071952',
        outer: '#0c134f',
      },
    ]
  }
})

Credits

• Inspired and based on the ideas of gcoro/react-qrcode-logo which support React.