Json Markdown Studio

A local desktop editor for JSON & Markdown

Built-in MCP server — let AI agents read & edit your files directly through a gated, permission-scoped interface. 100% local.

Windows · Tauri v2 · React 19 · TypeScript · Vite ·

Json Markdown Studio is a desktop editor for local files: JSON supports tree view / table view / live syntax validation, Markdown provides WYSIWYG editing, and it includes a built-in MCP server so external AI agents (Codex / Claude Code / Cursor) can operate on documents directly.

A lightweight desktop editor for local JSON & Markdown files — tree/table views, live JSON validation, WYSIWYG Markdown editing, plus a built-in MCP server so external AI agents can drive the editor directly.

✨ Features

• JSON — Tree / table / code views, live syntax validation with precise error location, path statistics

• Markdown — True WYSIWYG editing — click any rendered block and type, formatting applies live; floating format toolbar

• AI Integration (MCP Server) — Gated whitelist interface: external AI agents can read/write files, search, patch JSON by path, append markdown sections — read-only / confirm-before-write / full-access modes

• Lightweight Desktop Experience — Frameless custom title bar, fully local, no cloud dependency

Related MCP server: LocalNest MCP

📦 Installation

Download from GitHub Releases (Recommended)

The latest installers are available on the Releases page — choose as needed:

Download the latest installer from the Releases page — NSIS setup for regular use, MSI for enterprise deployment, or a portable exe that runs without installation.

Build from Source

Prerequisites: Node.js ≥ 20, Rust (MSVC toolchain, see rustup)

npm install          # 安装依赖 install dependencies
npm run tauri dev    # 桌面开发模式 desktop dev mode (runs Vite + Rust backend)
npm run tauri build  # 构建安装包 build installers (NSIS + MSI)

Frontend standalone development: npm run dev (Vite defaults to port 3000).

🧩 MCP Server (AI Agent Integration)

In Settings → External AI Agent Integration (MCP Server), select the access mode (read-only / confirm-before-write / full access) and the server starts:

• Listen address: http://127.0.0.1:<random port>/mcp

• Port discovery file: %APPDATA%\com.jsonmarkdownstudio.app\mcp.port

# 示例：Claude Code / Codex 等 MCP 客户端配置
{
  "mcpServers": {
    "json-md-studio": {
      "url": "http://127.0.0.1:<port>/mcp"
    }
  }
}

Built-in tool examples: app.getState (app state), file.read/setContent/replace/insert/delete (file read/write/edit), search.run (search), json.validate (JSON validation), document.updateValueByPath (update value by JSON path), view.setMode (switch view).

🗂 Tech Stack

🤝 Contributing

Issues and PRs are welcome. Core code lives in src/ (frontend) and src-tauri/ (Rust backend, with src-tauri/src/mcp/ for the MCP server).

📄 License

MIT