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MCP Server Logger

@mlshv

基本信息

分类

其他

许可证

MIT

传输方式

stdio

作者

mlshv

关于 MCP Server Logger

console.log for your stdio MCP server

MCP Server Logger 配置

使用下面的配置,将此服务器添加到你的 MCP 客户端。

{
  "mcpServers": {
    "mcps-logger": {
      "command": "npx",
      "args": [
        "mcps-logger"
      ]
    }
  }
}

MCP Server Logger 工具

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当前收录暂时没有可展示的工具列表,不代表服务没有工具。请查阅项目文档了解支持的能力。

点击上方按钮,在临时沙箱中运行此服务器并实时获取工具列表。

概览

What is MCP Server Logger?

MCP Server Logger provides a way to use console.log and other console methods in an MCP server using stdio transport without breaking protocol communication. It patches console.log, warn, error, and debug to redirect their output to a separate terminal. This project is for developers building or debugging MCP servers with stdio transport.

How to use MCP Server Logger?

First run npx mcps-logger in a terminal where you want to see logs. Then install the package (npm install mcps-logger) and add import "mcps-logger/console" to your MCP server’s entry file. For development‑only usage, wrap the import in a NODE_ENV !== "production" condition.

Key features of MCP Server Logger

  • Patches console.log, warn, error, and debug
  • Redirects logs to a separate terminal
  • Prevents JSON parse errors in MCP Inspector
  • Simple one-line import to activate
  • Supports conditional use in development mode

Use cases of MCP Server Logger

  • Debugging MCP servers while they communicate via stdio
  • Separating log output from the protocol message stream
  • Avoiding SyntaxError from stray console.log calls in MCP Inspector
  • Using familiar console methods without breaking MCP transport

常见问题

1

What problem does MCP Server Logger solve?

When stdio transport is used, console.log calls produce text that the MCP client cannot parse as JSON, causing SyntaxError in tools like MCP Inspector. The logger redirects console messages to a separate terminal, preserving protocol integrity.

2

How do I install and use MCP Server Logger?

Install via npm (`npm install mcps-logger`), then import `"mcps-logger/console"` in your server’s entry file. Before starting the server, run `npx mcps-logger` in a separate terminal to see the redirected logs.

3

Can I use MCP Server Logger in production?

The README suggests using it only in development mode (e.g., `if (process.env.NODE_ENV !== "production")`). It is designed as a debugging aid, not a production logging solution.

4

What console methods does it patch?

It patches `log`, `warn`, `error`, and `debug`.

5

Do I need to modify existing console.log calls to use it?

No. The import automatically patches all console methods so existing calls are redirected without source code changes.

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