Demerzels-lab Table Image Generator
Generate PNG table images from JSON data. Perfect for messaging platforms where ASCII tables break.
Why This Skill?
- ✅ No ASCII hell - Clean images that render consistently everywhere
- ✅ No Puppeteer - Pure Node.js with Sharp, lightweight
- ✅ Dark mode - Matches Discord dark theme
- ✅ Auto-sizing - Columns adjust to content
- ✅ Fast - Generates in <100ms
Setup (one-time)
cd /data/clawd/skills/table-image/scripts && npm install
Quick Usage
# Simple table
node /data/clawd/skills/table-image/scripts/table.mjs \
--data '[{"Name":"Alice","Score":95},{"Name":"Bob","Score":87}]' \
--output table.png
# With title and dark mode
node table.mjs \
--data '[{"Item":"Coffee","Price":"$4.50"},{"Item":"Tea","Price":"$3.00"}]' \
--title "Menu" \
--dark \
--output menu.png
Options
| Option | Description | Default |
|---|---|---|
--data |
JSON array of row objects | required |
--output |
Output file path | table.png |
--title |
Table title | none |
--dark |
Dark mode (Discord-friendly) | false |
--columns |
Column order/subset (comma-separated) | all keys |
--headers |
Custom header names (comma-separated) | field names |
--max-width |
Maximum table width | 800 |
--font-size |
Font size in pixels | 14 |
--header-color |
Header background color | #e63946 |
--stripe |
Alternating row colors | true |
--align |
Column alignments (l,r,c comma-sep) | auto |
--compact |
Reduce padding | false |
Examples
Basic Table
node table.mjs \
--data '[{"Name":"Alice","Age":30,"City":"NYC"},{"Name":"Bob","Age":25,"City":"LA"}]' \
--output people.png
Custom Columns & Headers
node table.mjs \
--data '[{"first_name":"Alice","score":95,"date":"2024-01"}]' \
--columns "first_name,score" \
--headers "Name,Score" \
--output scores.png
Right-Align Numbers
node table.mjs \
--data '[{"Item":"Coffee","Price":4.50},{"Item":"Tea","Price":3.00}]' \
--align "l,r" \
--output prices.png
Dark Mode for Discord
node table.mjs \
--data '[{"Symbol":"AAPL","Change":"+2.5%"},{"Symbol":"GOOGL","Change":"-1.2%"}]' \
--title "Market Watch" \
--dark \
--output stocks.png
Compact Mode
node table.mjs \
--data '[...]' \
--compact \
--font-size 12 \
--output small-table.png
Input Formats
JSON Array (default)
--data '[{"col1":"a","col2":"b"},{"col1":"c","col2":"d"}]'
Pipe from stdin
echo '[{"Name":"Test"}]' | node table.mjs --output out.png
From file
cat data.json | node table.mjs --output out.png
Tips
- Use
--darkfor Discord - Matches the dark theme, looks native - Auto-alignment - Numbers are right-aligned by default
- Column order - Use
--columnsto reorder or subset - Long text - Will truncate with ellipsis to fit
--max-width
Technical Notes
- Uses Sharp for PNG generation (same as chart-image)
- Generates SVG internally, converts to PNG
- No browser, no Puppeteer, no Canvas native deps
- Works on Fly.io, Docker, any Node.js environment