chart-image
Chart Image Generator
Generate PNG chart images from data using Vega-Lite. Perfect for headless server environments.
Why This Skill?
Built for Fly.io / VPS / Docker deployments:
- ✅ No native compilation - Uses Sharp with prebuilt binaries (unlike
canvaswhich requires build tools) - ✅ No Puppeteer/browser - Pure Node.js, no Chrome download, no headless browser overhead
- ✅ Lightweight - ~15MB total dependencies vs 400MB+ for Puppeteer-based solutions
- ✅ Fast cold starts - No browser spinup delay, generates charts in <500ms
- ✅ Works offline - No external API calls (unlike QuickChart.io)
Alternatives and why they don't work well on Fly:
canvasnpm - Requires native compilation, fails on minimal Docker images- Puppeteer + Chart.js - 400MB+ Chrome download, slow cold starts, memory heavy
- QuickChart API - External dependency, rate limits, privacy concerns
- Plotly - Needs Puppeteer for static image export
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