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MCP Server Logger: Real-Time Monitoring & Instant Debugging - MCP Implementation

MCP Server Logger: Real-Time Monitoring & Instant Debugging

MCP Server Logger: Your real-time console.log for MCP servers. Monitor, debug, and optimize with seamless visibility into stdio outputs. Elevate server insights, simplify troubleshooting.

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40% of users reported increased productivity after just one week

About MCP Server Logger

What is MCP Server Logger: Real-Time Monitoring & Instant Debugging?

Imagine building an MCP server with stdio transport and suddenly getting JSON parsing errors every time you call console.log. That’s the exact pain this tool solves. MCP Server Logger acts as a shield between your debugging output and the protocol’s communication channels, redirecting logs to a separate terminal without disrupting your server’s core functionality. Think of it as a duct tape-free solution for keeping your dev sanity intact.

How to Use MCP Server Logger: Real-Time Monitoring & Instant Debugging?

Setup follows the classic "install, import, profit" formula:

  • Launch the listener first: npx mcps-logger in your terminal of choice
  • Package install: npm i mcps-logger adds the middleware
  • Import it conditionally: Wrap with if (!production) to keep logs out of prod

Once active, all console outputs magically appear in the dedicated terminal instead of muddying your protocol streams.

MCP Server Logger Features

Key Features of MCP Server Logger: Real-Time Monitoring & Instant Debugging?

Here’s why this isn’t just another logger:

  • Protocol-safe logging: Maintains stdio integrity while letting you debug freely
  • Real-time terminal mirroring: No more guessing if your logs made it through
  • Env-aware: Opt-out in production without code changes
  • Zero-config startup: Works out the box with standard MCP setups

It’s like having a separate debugging universe that plays nicely with your server’s actual work.

Use Cases of MCP Server Logger: Real-Time Monitoring & Instant Debugging?

Perfect for:

  • Tracking down those "works on my machine" issues during development
  • Live debugging without interrupting production-like stdio workflows
  • Multi-developer environments where console spam needs containment
  • CI/CD pipelines needing clean logs while retaining debug capability

Essential for anyone doing serious MCP server work beyond "hello world" examples.

MCP Server Logger FAQ

FAQ from MCP Server Logger: Real-Time Monitoring & Instant Debugging?

  • Does this work with all MCP versions? Designed for v2+ but patches gracefully older setups
  • Why no log buffering? Real-time delivery is a core design principle
  • Can I customize output? Not yet, but PRs welcome for formatting enhancements
  • What about performance? Overhead is negligible compared to protocol handling

Still stuck? Check the demo video or open an issue on GitHub.

Content

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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