Garc33 Js Sandbox MCP Server

🚀 JS-Sandbox MCP Server

A Model Context Protocol server that provides a secure JavaScript execution environment.

🚀 Quick Start

The JS-Sandbox MCP Server offers a secure environment for executing JavaScript code, ensuring safety through isolation and configurable resource limits.

✨ Features

Tools

• execute_js - Execute JavaScript code in an isolated environment.
  • Parameters:
    • code (Required): The JavaScript code to be executed.
    • timeout (Optional): The maximum execution time in milliseconds (100 - 30000ms).
    • memory (Optional): The memory limit in bytes (1MB - 100MB).
  • Returns: The result of the code execution.

Security

• Isolate code execution in a controlled environment.
• Configurable execution time and memory limits.
• Protect against malicious code.

📦 Installation

Install Dependencies

npm install

Build the Server

npm run build

Development Mode with Automatic Rebuild

npm run watch

Configuration for Claude Desktop

To use with Claude Desktop, add the server configuration:

MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "js-sandbox": {
      "command": "/path/to/js-sandbox/build/index.js"
    }
  }
}

Debugging

Since MCP servers communicate via stdio, debugging can be challenging. We recommend using MCP Inspector, which can be obtained via:

npm run inspector

The Inspector will provide a URL to access debugging tools in the browser.