MCPJam Inspector is a developer tool designed for testing and debugging MCP (Model-Centric Protocol) servers. It provides a Postman-like interface for interacting with MCP servers, supporting various communication protocols and offering features for tool execution, LLM integration, and enhanced logging. The target audience includes developers working with MCP servers who need a streamlined way to test, debug, and interact with their applications.

How It Works

The inspector utilizes a client-server architecture. The backend, built with Express.js and WebSocket support, handles communication with MCP servers via STDIO, SSE, or Streamable HTTP. The frontend, a React/TypeScript application, provides a user interface for sending requests, executing server tools with live parameter input, and interacting with LLMs. This approach allows for flexible connection to diverse MCP server implementations and offers a unified debugging experience.

Quick Start & Requirements

• Install/Run: npx @mcpjam/inspector@latest
• Prerequisites: Node.js v22.7.5+, npm v10.0.0+. Docker is an alternative for running.
• Setup: Instantaneous via npx. Docker image available on Docker Hub.
• Links: npm, Docker Hub, Website, Docs

Highlighted Details

• Supports STDIO, SSE, and Streamable HTTP protocols for MCP server connections.
• Features LLM tool interaction for testing against real language models.
• Includes enhanced logging, request saving, and multi-server connection capabilities.
• Forked from @modelcontextprotocol/inspector with claimed enhancements.

Maintenance & Community

• Actively developed by the MCPJam team.
• Discord server available for community interaction: Discord.
• Roadmap and discussions available on GitHub.

Licensing & Compatibility

• Licensed under Apache License 2.0.
• Permissive license suitable for commercial use and integration with closed-source projects.

Limitations & Caveats

The project is a fork of another inspector, indicating potential for feature parity differences or ongoing integration efforts. The roadmap suggests ongoing UI/UX improvements and feature development, implying the project is still evolving.