vega
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 ```vega fence. 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
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