/json-canvas

name: json-canvas
description: Create and edit JSON Canvas files (.canvas) with nodes, edges, groups, and connections. Use when working with .canvas files, creating visual canvases, mind maps, flowcharts, or when the user mentions Canvas files in Obsidian.

JSON Canvas Skill

This skill enables skills-compatible agents to create and edit valid JSON Canvas files (`.canvas`) used in Obsidian and other applications.

Overview

JSON Canvas is an open file format for infinite canvas data. Canvas files use the `.canvas` extension and contain valid JSON following the [JSON Canvas Spec 1.0](https://jsoncanvas.org/spec/1.0/).

File Structure

A canvas file contains two top-level arrays:

{
  "nodes": [],
  "edges": []
}

• `nodes` (optional): Array of node objects
• `edges` (optional): Array of edge objects connecting nodes

Nodes

Nodes are objects placed on the canvas. There are four node types:

• `text` - Text content with Markdown
• `file` - Reference to files/attachments
• `link` - External URL
• `group` - Visual container for other nodes

Z-Index Ordering

Nodes are ordered by z-index in the array:

• First node = bottom layer (displayed below others)
• Last node = top layer (displayed above others)

Generic Node Attributes

All nodes share these attributes:

| Attribute | Required | Type | Description | |-----------|----------|------|-------------| | `id` | Yes | string | Unique identifier for the node | | `type` | Yes | string | Node type: `text`, `file`, `link`, or `group` | | `x` | Yes | integer | X position in pixels | | `y` | Yes | integer | Y position in pixels | | `width` | Yes | integer | Width in pixels | | `height` | Yes | integer | Height in pixels | | `color` | No | canvasColor | Node color (see Color section) |

Text Nodes

Text nodes contain Markdown content.

{
  "id": "6f0ad84f44ce9c17",
  "type": "text",
  "x": 0,
  "y": 0,
  "width": 400,
  "height": 200,
  "text": "# Hello World\n\nThis is **Markdown** content."
}

| Attribute | Required | Type | Description | |-----------|----------|------|-------------| | `text` | Yes | string | Plain text with Markdown syntax |

File Nodes

File nodes reference files or attachments (images, videos, PDFs, notes, etc.).

{
  "id": "a1b2c3d4e5f67890",
  "type": "file",
  "x": 500,
  "y": 0,
  "width": 400,
  "height": 300,
  "file": "Attachments/diagram.png"
}

{
  "id": "b2c3d4e5f6789012",
  "type": "file",
  "x": 500,
  "y": 400,
  "width": 400,
  "height": 300,
  "file": "Notes/Project Overview.md",
  "subpath": "#Implementation"
}

| Attribute | Required | Type | Description | |-----------|----------|------|-------------| | `file` | Yes | string | Path to file within the system | | `subpath` | No | string | Link to heading or block (starts with `#`) |

Link Nodes

Link nodes display external URLs.

{
  "id": "c3d4e5f678901234",
  "type": "link",
  "x": 1000,
  "y": 0,
  "width": 400,
  "height": 200,
  "url": "https://obsidian.md"
}

| Attribute | Required | Type | Description | |-----------|----------|------|-------------| | `url` | Yes | string | External URL |

Group Nodes

Group nodes are visual containers for organizing other nodes.

{
  "id": "d4e5f6789012345a",
  "type": "group",
  "x": -50,
  "y": -50,
  "width": 1000,
  "height": 600,
  "label": "Project Overview",
  "color": "4"
}

{
  "id": "e5f67890123456ab",
  "type": "group",
  "x": 0,
  "y": 700,
  "width": 800,
  "height": 500,
  "label": "Resources",
  "background": "Attachments/background.png",
  "backgroundStyle": "cover"
}

| Attribute | Required | Type | Description | |-----------|----------|------|-------------| | `label` | No | string | Text label for the group | | `background` | No | string | Path to background image | | `backgroundStyle` | No | string | Background rendering style |

Background Styles

| Value | Description | |-------|-------------| | `cover` | Fills entire width and height of node | | `ratio` | Maintains aspect ratio of background image | | `repeat` | Repeats image as pattern in both directions |

Edges

Edges are lines connecting nodes.

{
  "id": "f67890123456789a",
  "fromNode": "6f0ad84f44ce9c17",
  "toNode": "a1b2c3d4e5f67890"
}

{
  "id": "0123456789abcdef",
  "fromNode": "6f0ad84f44ce9c17",
  "fromSide": "right",
  "fromEnd": "none",
  "toNode": "b2c3d4e5f6789012",
  "toSide": "left",
  "toEnd": "arrow",
  "color": "1",
  "label": "leads to"
}

| Attribute | Required | Type | Default | Description | |-----------|----------|------|---------|-------------| | `id` | Yes | string | - | Unique identifier for the edge | | `fromNode` | Yes | string | - | Node ID where connection starts | | `fromSide` | No | string | - | Side where edge starts | | `fromEnd` | No | string | `none` | Shape at edge start | | `toNode` | Yes | string | - | Node ID where connection ends | | `toSide` | No | string | - | Side where edge ends | | `toEnd` | No | string | `arrow` | Shape at edge end | | `color` | No | canvasColor | - | Line color | | `label` | No | string | - | Text label for the edge |

Side Values

| Value | Description | |-------|-------------| | `top` | Top edge of node | | `right` | Right edge of node | | `bottom` | Bottom edge of node | | `left` | Left edge of node |

End Shapes

| Value | Description | |-------|-------------| | `none` | No endpoint shape | | `arrow` | Arrow endpoint |

Colors

The `canvasColor` type can be specified in two ways:

Hex Colors

{
  "color": "#FF0000"
}

Preset Colors

{
  "color": "1"
}

| Preset | Color | |--------|-------| | `"1"` | Red | | `"2"` | Orange | | `"3"` | Yellow | | `"4"` | Green | | `"5"` | Cyan | | `"6"` | Purple |

Note: Specific color values for presets are intentionally undefined, allowing applications to use their own brand colors.

Complete Examples

Simple Canvas with Text and Connections

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