mcps-logger

# MCP Server Logger console.log for your stdio MCP server [](https://www.npmjs.com/package/mcps-logger) [](https://opensource.org/licenses/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: ```shell npx mcps-logger ``` Install the logger in your MCP server: ```shell npm install mcps-logger ``` Add it to your MCP server entry file: ```typescript import "mcps-logger/console"; ``` Or if you want to use in development mode only: ```typescript if (process.env.NODE_ENV !== "production") { import("mcps-logger/console"); } ```