canvas
Create spatial diagrams with free-positioned nodes using JSON format. Best for concept maps, knowledge graphs, and planning boards requiring precise x/y coordinate control.
What this skill does
# JSON Canvas Visualizer
**Quick Start:** Define nodes with `id`, `type`, `x`, `y`, `width`, `height` → Plan layout on 100px grid → Connect edges with `fromNode`/`toNode` → Apply colors (1-6) → Wrap in ` ```canvas ` fence. Origin (0,0) at top-left, X right, Y down. Obsidian Canvas compatible.
---
## Critical Syntax Rules
### 1. Structure Format
```canvas
{
"nodes": [
{"id": "n1", "type": "text", "text": "Node 1", "x": 0, "y": 0, "width": 120, "height": 50}
],
"edges": []
}
```
### 2. Node Types
| Type | Required Fields | Purpose |
|------|----------------|---------|
| `text` | `text` | Display custom text content |
| `file` | `file` | Reference external files |
| `link` | `url` | External URL references |
| `group` | `label` | Visual container for grouping |
### 3. Required Node Attributes
All nodes require: `id`, `type`, `x`, `y`, `width`, `height`
### 4. Color Presets
| Value | Color |
|-------|-------|
| `"1"` | Red |
| `"2"` | Orange |
| `"3"` | Yellow |
| `"4"` | Green |
| `"5"` | Cyan |
| `"6"` | Purple |
### 5. Edge Connections
```json
{
"id": "e1",
"fromNode": "n1",
"fromSide": "right",
"toNode": "n2",
"toSide": "left",
"toEnd": "arrow"
}
```
### 6. Coordinate System
- Origin (0,0) at top-left
- X increases to the right
- Y increases downward
### 7. Node Sizing
- Consider text content when setting node dimensions
- Multi-line text requires more height to display all lines
- Long words require more width to avoid overflow
---
## Common Pitfalls
| Issue | Solution |
|-------|----------|
| Nodes overlapping | Increase spacing (100+ px) |
| Edges not visible | Verify `fromNode`/`toNode` match node IDs |
| Invalid JSON | Check quotes and commas |
| IDs invalid | Use only a-z, A-Z, 0-9, -, _ |
---
## Output Format
````markdown
```canvas
{
"nodes": [...],
"edges": [...]
}
```
````
---
## Related Files
> For detailed syntax and advanced features, refer to references below:
- [syntax.md](references/syntax.md) — Complete attribute reference: node types, edge properties, group styling, and advanced examples
## Resources
- [JSON Canvas Specification](https://jsoncanvas.org/spec/1.0/)
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