Node.js Debugger MCP Server

# Node.js Debugger MCP Server An MCP server that provides Node.js debugging capabilities with process management for AI agents. <a href="https://glama.ai/mcp/servers/@qckfx/node-debugger-mcp"> <img width="380" height="200" src="https://glama.ai/mcp/servers/@qckfx/node-debugger-mcp/badge" alt="Node.js Debugger Server MCP server" /> </a> ## Features - **Process Management**: Start/stop Node.js processes with debugging enabled - **Debugging Tools**: Set breakpoints, step through code, evaluate expressions - **Inspector Integration**: Connect to Node.js Inspector API - **AI Agent Friendly**: Designed for long-running debugging sessions ## Installation 1. Build the server: ```bash npm install npm run build ``` 2. **For Project-Specific Use**: The `.mcp.json` file is already configured in this project 3. **For User-Wide Use**: Add to your global Claude Code configuration: ```bash claude mcp add --scope user debugger-mcp node /absolute/path/to/debugger-mcp/build/index.js ``` 4. **For Global Use**: Copy the `.mcp.json` to your projects or add to global config ## Usage with Claude Code Once configured, you'll have access to these tools in Claude Code: ### Process Management - `start_node_process` - Launch Node.js scripts with debugging - `kill_process` - Terminate processes by PID - `list_processes` - Show all managed processes ### Debugging - `attach_debugger` - Connect to debug port - `set_breakpoint` - Set breakpoints with optional conditions - **Important**: Use full `file://` URLs for reliable breakpoint hits - Example: `file:///Users/you/project/script.js` - `step_debug` - Step through code (next/step/continue/out) - `pause_execution` - Manually pause a running process - `evaluate_expression` - Evaluate expressions in debug context ### Resources - `debug://session` - Current debug session state - `debug://processes` - List of managed processes ## Example Usage 1. Start a Node.js process: ``` Use the start_node_process tool with script: "example-app.js" ``` 2. Attach debugger: ``` Use attach_debugger tool with the port returned from step 1 ``` 3. Set breakpoints and debug: ``` # Set a breakpoint using full file URL Use set_breakpoint tool with: - file: "file:///absolute/path/to/example-app.js" - line: 5 # Control execution Use step_debug tool with action: "continue" ``` ## Key Features - **Automatic Pause on Start**: Uses `--inspect-brk` flag to pause at first line - **Full Chrome DevTools Protocol**: Real debugging, not simulation - **Reliable Breakpoints**: Use `file://` URLs for consistent breakpoint hits - **Process Management**: Track and manage multiple debugging sessions ## Testing Test with the included example app: ```bash node --inspect=9229 example-app.js ``` Then use the MCP tools to debug it! ## Debug the MCP Server ```bash npm run inspector ```