JavaScript MCP Server

A JavaScript execution server for the Model Context Protocol (MCP), allowing AI models to run JavaScript code through MCP tool calls.

Features

JavaScript Execution: Run JavaScript code in one-time script execution mode
REPL Sessions: Maintain stateful REPL sessions across multiple interactions
TypeScript Support: Run TypeScript code with automatic transpilation
NPM Integration: Import and use npm packages dynamically
Module Importing: Import modules from Node.js and local files
Error Handling: Comprehensive error handling with formatted stack traces

Installation

# Clone the repository
git clone https://github.com/yannbam/fresh-js-mcp.git
cd fresh-js-mcp

# Install dependencies
npm install

# Build the project
npm run build

Usage

# Start the MCP server
npm start

Available Tools

execute: Run JavaScript code once and return the result
createSession: Create a new REPL session
executeInSession: Execute code in an existing session
listSessions: List all active REPL sessions
deleteSession: Delete a REPL session

Development

# Run in development mode with hot reloading
npm run dev

# Lint the code
npm run lint

# Run tests
npm test

Architecture

The JavaScript MCP server follows a layered architecture:

MCP Protocol Layer: Handles client communication
JavaScript Execution Layer: Executes code in isolated environments
Resource Management Layer: Manages packages and TypeScript
Session Management Layer: Maintains REPL sessions with state persistence

License

MIT

This server cannot be installed

security - not tested

license - not found

quality - not tested

How are these scores calculated?

remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

Allows AI models to run JavaScript/TypeScript code through Model Context Protocol tool calls, supporting both one-time script execution and stateful REPL sessions with npm package integration.

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