-
security-
license-
qualityA TypeScript application that allows Claude to safely execute bash commands with security safeguards, providing a secure interface through the Model Context Protocol.
This JavaScript Sandbox MCP Server provides a secure environment to execute JavaScript code with configurable constraints:
Run JavaScript in an isolated environment
Set memory limits (1MB to 100MB)
Configure execution timeouts (100ms to 30000ms)
Safely execute untrusted code such as plugins or bots
Provides a secure environment for executing JavaScript code with configurable memory and time limits, allowing safe evaluation of JavaScript snippets.
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 environmentParameters:
code(required): JavaScript code to executetimeout(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.
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