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🦀 ClawHub

QRCode

by @hexavi8

Generate styled QR codes (SVG/PNG/JPG) from user input. Supports custom module color, background, dot shape and eye shape, and many output options.

Versionv1.0.1

Downloads1,369

Installs5

Stars⭐ 2

#finance #legal #gaming

View on ClawHub →

TERMINAL

clawhub install qrcode

📖 About This Skill

name: qrcode description: Generate styled QR codes (SVG/PNG/JPG) with custom colors, shapes, and error correction. Agent should display generated files. Secure: all outputs saved to workspace root. homepage: https://github.com/HeXavi8/skills metadata: { "clawdbot": { "emoji": "", "requires": { "bins": ["node"], "packages": ["qrcode", "sharp"] }, "primaryEnv": null, }, }

QRCode Generator

Generate customizable QR codes from text or URLs. Supports multiple formats (SVG/PNG/JPG) with styling options.

Agent Instructions

After generating QR codes, you MUST:

1. Display the generated file using appropriate markdown syntax: - For images (PNG/JPG): !QR Code - For SVG: Display as image or provide download link 2. Confirm the file path and format to the user 3. Offer to regenerate with different styling if needed

Quick Start

# Basic usage (auto-generated filename)
node {baseDir}/scripts/generate.mjs "Hello World"
Custom styled QR code
node {baseDir}/scripts/generate.mjs "https://example.com" -o myqr.svg --dot circle --eye rounded --color "#2563eb"
High-resolution transparent PNG
node {baseDir}/scripts/generate.mjs "Contact Info" --format png --size 2048 --transparent
Print-quality JPEG
node {baseDir}/scripts/generate.mjs "https://example.com" --format jpg -o qr.jpg --size 2048 --quality 95

Options

Output

-o, --out - Output filename (workspace root only). Default: qrcode__.

--format - Output format (default: svg)

Dimensions

--size - Base pixel size (default: 1024, max: 10000)

--scale - Resolution multiplier (default: 1, max: 10)

--margin - Quiet zone size (default: 4, max: 100)

Styling

--dot - Data module shape (default: square)

--eye - Finder pattern style (default: square)

--color <#RRGGBB> - Foreground color (default: #000000)

--background <#RRGGBB> - Background color (default: #ffffff)

--transparent - Transparent background (PNG only, ignored for SVG/JPG)

Quality

--ec - Error correction: Low/Medium/Quality/High (default: M)

- L (~7%): Clean environments, maximum data capacity - M (~15%): General use, balanced capacity/reliability - Q (~25%): Styled QR codes, moderate damage tolerance - H (~30%): Logo embedding, heavy styling, outdoor use

--quality <1-100> - JPEG compression quality (default: 80)

File Handling

Security-enforced workspace root output:

All files saved to workspace root directory only

Path components stripped: -o ../path/file.svg → workspace/file.svg

Auto-generated filenames include sanitized text and timestamp

Maximum text length: 4096 characters

Installation

cd {baseDir}
npm install

Dependencies: qrcode (matrix generation), sharp (image conversion)

Platform notes: macOS requires Xcode Command Line Tools. See sharp docs for other platforms.

Examples

WiFi QR Code

node {baseDir}/scripts/generate.mjs "WIFI:S:MyNetwork;T:WPA;P:password123;;" --format png -o wifi.png --size 1024

Styled Business Card

node {baseDir}/scripts/generate.mjs "BEGIN:VCARD
VERSION:3.0
FN:John Doe
TEL:+1234567890
EMAIL:john@example.com
END:VCARD" --dot circle --eye rounded --color "#1e40af" --background "#eff6ff" -o contact.svg

High-Resolution Print

node {baseDir}/scripts/generate.mjs "https://example.com" --format jpg --size 4096 --quality 95 --ec H -o print.jpg

Transparent Logo Overlay

node {baseDir}/scripts/generate.mjs "https://example.com" --format png --size 2048 --transparent --margin 2 -o overlay.png

Logo Embedding (Requires High Error Correction)

# Use --ec H when QR code will have logo overlay (covers ~20-30% of center)
node {baseDir}/scripts/generate.mjs "https://example.com" --format png --size 2048 --ec H -o logo-base.png

Security Features

✅ Path traversal protection - All outputs forced to workspace root

✅ Symlink attack prevention - Atomic writes with verification

✅ Input validation - Length limits (4096 chars), character whitelisting

✅ Filename sanitization - Dangerous characters stripped from filenames

✅ Resource limits - Max size/scale to prevent DoS attacks

Troubleshooting

| Issue | Solution | | ------------------- | -------------------------------------------------------------------------------------------------------------------------- | | npm install fails | Install build tools:xcode-select --install (macOS) or see sharp install guide | | QR code won't scan | Increase --size, use higher error correction (--ec H), or simplify styling | | Colors not working | Use hex format #RRGGBB (e.g., #FF5733), not RGB or color names | | File too large | Reduce --size, --scale, or increase --quality for JPG | | Permission denied | Check workspace directory write permissions |

Error Correction Levels Explained

Error correction allows QR codes to remain scannable even when partially damaged or obscured:

| Level | Recovery Capacity | Data Capacity | Use Case | | ----- | ----------------- | ------------- | ---------------------------------------------------------- | | L | ~7% damage | Maximum | Clean environments, screen display, maximum data | | M | ~15% damage | High | General use (default), standard printing | | Q | ~25% damage | Medium | Styled designs (circles/rounded), possible minor damage | | H | ~30% damage | Minimum | Logo embedding, outdoor use, heavy styling, print-on-print |

Key principle: Higher error correction = more damage tolerance but less data capacity.

When to use H level:

Embedding logos (covers 20-30% of center)

Circular dots or rounded eyes

Outdoor/weathered environments

Low-quality printing

Stickers that may peel/scratch

Format Comparison

| Format | Transparency | Quality | File Size | Use Case | | ------ | ------------ | -------- | ---------- | -------------------------- | | SVG | ✅ | Infinite | Smallest | Web, scalable graphics | | PNG | ✅ | Lossless | Medium | Digital displays, overlays | | JPG | ❌ | Lossy | Smallest\* | Print, photos, email |

\*With compression

Tips

Scanning distance: Use --size 1024 for mobile (1-2m), --size 2048+ for print/posters

Styling vs. reliability: Higher --ec levels compensate for --dot circle or --eye rounded

Transparent backgrounds: Use PNG format with --transparent; JPG always uses white/specified background

File size optimization: SVG for web, JPG with --quality 80-85 for print

Data capacity: L/M/Q/H levels affect max alphanumeric capacity: ~4296/3391/2420/1852 chars (Version 40)

Logo placement: Use --ec H and leave center area clear (approximately 30% of QR code)

Common Use Cases

| Scenario | Recommended Settings | | ------------------------- | ---------------------------------------------------------------- | | Website URL | --format png --size 1024 --ec M | | WiFi credentials | --format png --size 1024 --ec M | | Business card (vCard) | --format svg --dot circle --eye rounded --ec Q | | Print poster | --format jpg --size 4096 --quality 95 --ec H | | Logo overlay base | --format png --size 2048 --ec H --transparent | | Email signature | --format png --size 512 --ec M | | Product packaging | --format svg --ec H (scalable for any print size) | | Outdoor signage | --format jpg --size 2048+ --ec H --quality 90 | | Social media profile | --format png --size 1024 --transparent --dot circle --ec Q | | Payment QR (high density) | --format png --size 2048 --ec L --margin 2 (maximize capacity) |

💡 Examples