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2025-04-01

console.log for your stdio MCP server

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MCP Server Logger

console.log for your stdio MCP server

npm version License: MIT

Why?

When developing an MCP (Model Context Protocol) server with stdio transport, console.log interferes with the protocol communication.

For example, this is what you normally get in MCP inspector npx @modelcontextprotocol/inspector when calling console.log in your MCP server code:

Error from MCP server: SyntaxError: Unexpected token S in JSON at position 0

Solution

This package patches the console methods (log, warn, error, debug) and redirects logs to a separate terminal.

https://github.com/user-attachments/assets/33ff367e-74b4-48e8-9f04-0bcafbad5e00

Usage

Start the logger in a terminal where you want to see the logs:

npx mcps-logger

Install the logger in your MCP server:

npm install mcps-logger

Add it to your MCP server entry file:

import "mcps-logger/console";

Or if you want to use in development mode only:

if (process.env.NODE_ENV !== "production") {
    import("mcps-logger/console");
}

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    Reviews

    1 (1)
    Avatar
    user_WcjGeH0d
    2025-04-15

    The Azure AI Agent Service MCP Server by azure-ai-foundry is an exceptional product that has significantly streamlined my workflow. Its integration capabilities are top-notch and offer seamless performance. The product's link provides detailed information for easy setup and utilization. I highly recommend it to anyone looking to enhance their AI operations effectively.