Integrations
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 environment- Parameters:
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
- Parameters:
Security
- Isolated code execution in a controlled environment
- Configurable execution time and memory limits
- Protection against malicious code
Development
Install dependencies:
Build the server:
Development mode with auto-rebuild:
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
Debugging
Since MCP servers communicate over stdio, debugging can be challenging. We recommend using MCP Inspector, which is available as:
The Inspector will provide a URL to access debugging tools in your browser.
You must be authenticated.
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.
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