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. It ensures code execution is isolated and protected from malicious attacks.

✨ Features

Tools

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

Security

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

📦 Installation

When used with the 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 the MCP server communicates via stdio, debugging can be challenging. We recommend using the MCP Inspector, which can be obtained as follows:

npm run inspector

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

💻 Usage Examples

Basic Usage

Install Dependencies

npm install

Build the Server

npm run build

Automatic Rebuild in Development Mode

npm run watch