Skills chart-splat

Generate beautiful charts via the Chart Splat API. Use when the user asks to create, generate, or visualize data as charts, graphs, or plots. Supports line, bar, pie, doughnut, radar, polar area, and candlestick/OHLC charts. Returns PNG images.

install

source · Clone the upstream repo

git clone https://github.com/openclaw/skills

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/openclaw/skills "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/bobbyg603/chart-splat" ~/.claude/skills/clawdbot-skills-chart-splat && rm -rf "$T"

manifest: skills/bobbyg603/chart-splat/SKILL.md

source content

Chart Splat

Generate beautiful charts from data using the Chart Splat API. Charts are rendered server-side with Chart.js and returned as PNG images.

Supported Chart Types

Type	Best For
`line`	Trends over time
`bar`	Comparing categories
`pie`	Parts of a whole
`doughnut`	Parts of a whole (with center space)
`radar`	Multivariate comparison
`polarArea`	Comparing categories with radial layout
`candlestick`	Financial/crypto OHLC price data
`ohlc`	Financial/crypto OHLC price data (bar variant)

Method 1: CLI (Preferred)

Use the

chartsplat

CLI via npx. No install required.

npx -y chartsplat-cli bar \
  --labels "Q1,Q2,Q3,Q4" \
  --data "50,75,60,90" \
  --title "Quarterly Revenue" \
  --color "#8b5cf6" \
  -o chart.png

CLI Options

Flag	Description
`-l, --labels <csv>`	Comma-separated labels
`-d, --data <csv>`	Comma-separated numeric values
`-t, --title <text>`	Chart title
`--label <text>`	Dataset label for legend
`-c, --color <hex>`	Background color
`-w, --width <px>`	Image width (default: 800)
`--height <px>`	Image height (default: 600)
`-o, --output <file>`	Output file path (default: chart.png)
`--config <file>`	JSON config file for complex charts

CLI Chart Commands

npx -y chartsplat-cli line -l "Mon,Tue,Wed,Thu,Fri" -d "100,200,150,300,250" -o line.png
npx -y chartsplat-cli bar -l "A,B,C" -d "10,20,30" -o bar.png
npx -y chartsplat-cli pie -l "Red,Blue,Green" -d "30,50,20" -o pie.png
npx -y chartsplat-cli doughnut -l "Yes,No,Maybe" -d "60,25,15" -o doughnut.png
npx -y chartsplat-cli radar -l "Speed,Power,Range,Durability,Precision" -d "80,90,70,85,95" -o radar.png
npx -y chartsplat-cli polararea -l "N,E,S,W" -d "40,30,50,20" -o polar.png
npx -y chartsplat-cli candlestick --config ohlc.json -o chart.png

Candlestick Charts

Candlestick and OHLC charts require a JSON config file since the data format is more complex than a simple CSV list. Use

--config

to provide a file with OHLC data points.

npx -y chartsplat-cli candlestick --config ohlc.json -o candlestick.png

Config format (

ohlc.json

{
  "type": "candlestick",
  "data": {
    "datasets": [{
      "label": "VVV Price",
      "data": [
        { "x": 1740441600000, "o": 4.23, "h": 4.80, "l": 4.10, "c": 4.45 },
        { "x": 1740528000000, "o": 4.45, "h": 5.50, "l": 4.30, "c": 5.34 },
        { "x": 1740614400000, "o": 5.34, "h": 6.20, "l": 5.10, "c": 5.97 }
      ]
    }]
  }
}

Each OHLC data point requires:

(numeric timestamp in ms, or a date string like

"2025-02-25"

(open),

(high),

(low),

(close).

Complex Charts via Config File

For multi-dataset or customized charts, write a JSON config file then pass it to the CLI:

npx -y chartsplat-cli bar --config chart-config.json -o chart.png

See examples/sample-charts.json for config file examples and references/api-reference.md for the full config schema.

Method 2: Helper Script

Use the bundled script for quick generation without installing the CLI:

node scripts/generate-chart.js bar "Q1,Q2,Q3,Q4" "50,75,60,90" "Revenue" chart.png

Or with a config file:

node scripts/generate-chart.js --config chart-config.json -o chart.png

Output Handling

Charts are saved as PNG files to the specified output path
Default output is
```
chart.png
```
in the current directory
For messaging platforms (Discord, Slack), return the file path:
```
MEDIA: /path/to/chart.png
```
The CLI and helper script handle base64 decoding automatically

Error Handling

Error	Cause	Fix
`API key required`	Missing `CHARTSPLAT_API_KEY`	Set the env var in agent config
`Invalid API key`	Wrong or revoked key	Generate a new key at chartsplat.com/dashboard
`Rate limit exceeded`	Monthly quota reached	Upgrade plan or wait for reset
`Invalid chart configuration`	Bad request payload	Check that `data.labels` and `data.datasets` are present (candlestick/ohlc only require `data.datasets` )

Tips

Always provide both
```
labels
```
and
```
data
```
arrays of the same length
Use hex colors (e.g.,
```
#8b5cf6
```
) for consistent styling
For pie/doughnut charts, use an array of colors for
```
backgroundColor
```
to color each segment
Default dimensions (800x600) work well for most uses; increase for presentations
The
```
--config
```
flag accepts any valid Chart.js configuration for full customization