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JavaScript Sandbox MCP Server

by garc33
npmGitHub
JavaScript
2
4
  • Apple
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js-sandbox MCP Server

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

Features

Tools

  • execute_js - Executes JavaScript code in an isolated environment
    • Parameters:
      • code (required): JavaScript code to execute
      • timeout (optional): Maximum execution time in milliseconds (100-30000ms)
      • memory (optional): Memory limit in bytes (1MB-100MB)
    • Returns the result of code execution

Security

  • Isolated code execution in a controlled environment
  • Configurable execution time and memory limits
  • Protection against malicious code

Development

Install dependencies:

npm install

Build the server:

npm run build

Development mode with auto-rebuild:

npm run watch

Installation

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 over stdio, debugging can be challenging. We recommend using MCP Inspector, which is available as:

npm run inspector

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

Install Server
A
security – no known vulnerabilities
F
license - not found
A
quality - confirmed to work

How are these scores calculated?

local-only server

The server can only run on the client's local machine because it depends on local resources.

Tools

Provides a secure, isolated JavaScript execution environment with configurable time and memory limits for safely running code from Claude.

  1. Features
    1. Tools
    2. Security
  2. Development
    1. Installation
      1. Debugging

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