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Vega / Vega-Lite Visualizer

Quick Start: Structure data as array of objects → Choose mark type (bar/line/point/area/arc/rect) → Map encodings (x, y, color, size) to fields → Set data types (quantitative/nominal/ordinal/temporal) → Wrap in vega-lite` or vegafence. Always include$schema`, use valid JSON with double quotes, field names are case-sensitive. Use Vega-Lite for 90% of charts; Vega only for radar, word cloud, force-directed.

Critical Syntax Rules

Rule 1: Always Include Schema

"$schema": "https://vega.github.io/schema/vega-lite/v5.json"

Rule 2: Valid JSON Only

❌ {field: "x",}     → Trailing comma, unquoted key
✅ {"field": "x"}    → Proper JSON

Rule 3: Field Names Must Match Data

❌ "field": "Category"  when data has "category"
✅ "field": "category"  → Case-sensitive match

Rule 4: Type Must Be Valid

✅ quantitative | nominal | ordinal | temporal
❌ numeric | string | date

Common Pitfalls

Output Format

```vega-lite
{...}
```

Or for full Vega:

```vega
{...}
```

Related Files

For advanced chart patterns and complex visualizations, refer to references below:

• examples.md — Stacked bar, grouped bar, multi-series line, area, heatmap, radar (Vega), word cloud (Vega), and interactive chart examples

Weekly Installs

64

Repository

markdown-viewer/skills

GitHub Stars

5

First Seen

Jan 31, 2026

Security Audits

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Installed on

opencode61

gemini-cli60

github-copilot60

codex59

kimi-cli57

amp57