MCPJam Inspector

The developer tool for testing and debugging MCP servers

Get up and running in seconds with the MCPJam Inspector:

npx @mcpjam/inspector@latest

That's it! The inspector will launch automatically in your browser at http://localhost:6274.

You can also run the inspector using Docker. First, make sure you have Docker installed and running.

Pull the latest image from Docker Hub:

docker pull mcpjam/mcp-inspector:main

Then, run the container:

docker run --rm -p 6274:6274 -p 6277:6277 mcpjam/mcp-inspector:main

The inspector will be available in your browser at http://127.0.0.1:6274.

This project is a fork of the @modelcontextprotocol/inspector. Many of the features are the same but with some enhancements. Key features include:

• STDIO / SSE / Streamable HTTP - This inspector supports all three protocols. Connect to any MCP server.
• Tool Execution - Run server tools with live parameter input. Easily debug errors.
• (New) LLM tool interaction - Test your MCP server against a real LLM.
• Debugging tools - Enhanced logging experience to debug your server.
• Quality of life improvements - Save requests, multi-server connection, saved connections.

• Node.js: ^22.7.5 or higher
• npm: ^10.0.0 or higher (comes with Node.js)

# Launch inspector with default settings
npx @mcpjam/inspector

# Connect to a server built at build/index.js
npx @mcpjam/inspector node build/index.js

# Pass custom arguments to your server
npx @mcpjam/inspector node server.js --port 3000 --debug

# Load servers from a config file
npx @mcpjam/inspector --config ./my-config.json

{
  "mcpServers": {
    "my-awesome-server": {
      "command": "node",
      "args": ["build/index.js"],
      "env": {
        "API_KEY": "your-api-key",
        "DEBUG": "true"
      }
    },
    "python-server": {
      "command": "python",
      "args": ["-m", "my_mcp_server"],
      "env": {
        "PYTHONPATH": "./src"
      }
    }
  }
}

The MCPJam Inspector is built as a modern monorepo with three main components:

📦 @mcpjam/inspector
├── 🖥️  client/     # React + TypeScript frontend
├── 🔧  server/     # Express.js backend with WebSocket support
└── 🚀  cli/        # Command-line interface

• Frontend: React 18, TypeScript, Tailwind CSS, Radix UI
• Backend: Express.js, WebSocket (ws), CORS support
• CLI: Node.js with shell integration
• Build Tools: Vite, TSC, Concurrently

# Clone the repository
git clone https://github.com/mcpjam/inspector.git
cd inspector

# Install dependencies
npm install

# Start development servers
npm run dev

# Build all components
npm run build

# Test the build
npm run start

We put together these commands to help you build locally:

We welcome contributions! We thought the original inspector repository moved too slowly, so we wanted to build this project ourselves.

1. Clone the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

We're continuously improving the MCPJam Inspector. Here's what's coming next:

• Fix dark mode styling - Improve run tool button appearance in dark mode
• Enhanced logging UX - Address misleading red color for INFO logs

• AI parameter fill - Smart parameter completion using AI
• Collections - Organize and group your MCP servers / tools
• Multi Provider support - Support for other LLMs like ChatGPT

• Security scanning - Built-in vulnerability scanning tools
• Electron App - Desktop application for enhanced user experience

• Landing page improvements - Update MCP Jam landing page
• Documentation expansion - Enhanced guides and tutorials

• Follow the existing code style (Prettier + ESLint)
• Update documentation as needed

• 🌐 Website: mcpjam.com
• 📖 Documentation: MCP Protocol Docs
• 🐛 Issues: GitHub Issues
• 💬 Discussions: GitHub Discussions

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.