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io.mcpcentral/jsoncanvas

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Create, validate, edit, export (markdown/svg/png/mermaid), and search JSON Canvas files.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http jsoncanvas 'https://jsoncanvas.mcpcentral.io/mcp' --header 'Authorization: <Bearer token from the MCPCentral gateway (Microsoft Entra OAuth at login.mcpcentral.io). Canvases are stored per authenticated user.>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "jsoncanvas": {
            "type": "http",
            "url": "https://jsoncanvas.mcpcentral.io/mcp",
            "headers": {
                "Authorization": "<Bearer token from the MCPCentral gateway (Microsoft Entra OAuth at login.mcpcentral.io). Canvases are stored per authenticated user.>"
            }
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. JSON Canvas MCP Server
  2. Authentication
  3. Client configuration
  4. Tools
  5. Resources
  6. Security
  7. License

JSON Canvas MCP Server

A remote Model Context Protocol server for working with JSON Canvas files — the open infinite-canvas format used by Obsidian. Create, validate, read, edit, export, and search .canvas files, with an inline interactive canvas viewer.

Hosted by MCPCentral at https://jsoncanvas.mcpcentral.io/mcp (Streamable HTTP). This repository is the public listing for the MCP Registry; the server itself is closed-source.

mcp-name: io.mcpcentral/jsoncanvas

Authentication

The endpoint requires Microsoft Entra OAuth via the MCPCentral gateway (login.mcpcentral.io). MCP clients perform the standard OAuth flow automatically: an unauthenticated request returns 401 with a WWW-Authenticate pointing at the RFC 9728 metadata at /.well-known/oauth-protected-resource, and the client takes you through sign-in. Canvases are stored privately per authenticated user.

Client configuration

Claude Code

claude mcp add jsoncanvas --transport http https://jsoncanvas.mcpcentral.io/mcp

Claude Desktop / other clients via mcp-remote

{
  "mcpServers": {
    "jsoncanvas": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://jsoncanvas.mcpcentral.io/mcp"]
    }
  }
}

Any MCP client that supports remote Streamable HTTP servers with OAuth (Claude, Goose, OpenAI connectors, MCP Inspector) can connect.

Tools

ToolDescription
create_canvasCreate a canvas from nodes (+ optional edges); stored under a date-prefixed .canvas name.
validate_canvasValidate canvas data against the JSON Canvas 1.0 spec.
read_canvasRead a stored canvas and return its nodes and edges.
list_canvasesList your stored canvases.
edit_canvasAtomic batch add/update/remove of nodes and edges (removing a node cascades its edges).
export_canvasExport to markdown, svg, mermaid, or png (full-fidelity raster via Browser Rendering).
search_canvasesCase-insensitive field-level search across your canvases.

create_canvas, read_canvas, and edit_canvas carry MCP Apps UI metadata so supporting hosts render the result inline in an interactive pan/zoom viewer.

Resources

  • canvas://schema — JSON Schema for canvas files.
  • canvas://examples/basic — a simple two-node example canvas.
  • ui://canvas/viewer.html — the interactive read-only viewer (MCP Apps UI).

Security

  • Per-user isolation — every canvas is scoped to the authenticated user; no cross-user reads.
  • Auth required — all tool calls require a valid Entra-issued bearer token.
  • Hardened — strict input/size caps, bounded search, accurate tool annotations, and an SSRF-blocked PNG renderer (the headless browser cannot be coerced into outbound requests).
  • Report vulnerabilities per SECURITY.md. Please do not open public issues for security reports.

License

MIT.

Frequently asked questions

What is io.mcpcentral/jsoncanvas?

Create, validate, edit, export (markdown/svg/png/mermaid), and search JSON Canvas files.

How do I install io.mcpcentral/jsoncanvas?

It runs as a remote server. In Claude Code: claude mcp add --transport http jsoncanvas 'https://jsoncanvas.mcpcentral.io/mcp' --header 'Authorization: <Bearer token from the MCPCentral gateway (Microsoft Entra OAuth at login.mcpcentral.io). Canvases are stored per authenticated user.>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.mcpcentral/jsoncanvas need an API key?

Yes. It expects Authorization, which you set in its configuration.

Is io.mcpcentral/jsoncanvas open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains io.mcpcentral/jsoncanvas?

It is published by mcpcentral-io. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.