Node.js Sandbox

A Node.js–based Model Context Protocol server that spins up disposable Docker containers to execute arbitrary JavaScript.

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6

7 Tools

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Version 4.43 or later needs to be installed to add the server automatically

Overview Tools (7)Manual installation

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Tools

Name Description

run_js_ephemeral Run a JavaScript snippet in a temporary disposable container with optional npm dependencies, then automatically clean up. The code must be valid ESModules (import/export syntax). Ideal for simple one-shot executions without maintaining a sandbox or managing cleanup manually. When reading and writing from the Node.js processes, you always need to read from and write to the "./files" directory to ensure persistence on the mounted volume. This includes images (e.g., PNG, JPEG) and other files (e.g., text, JSON, binaries). Example: ```js import fs from "fs/promises"; await fs.writeFile("./files/hello.txt", "Hello world!"); console.log("Saved ./files/hello.txt"); ```

Name	Description
`run_js_ephemeral`	Run a JavaScript snippet in a temporary disposable container with optional npm dependencies, then automatically clean up. The code must be valid ESModules (import/export syntax). Ideal for simple one-shot executions without maintaining a sandbox or managing cleanup manually. When reading and writing from the Node.js processes, you always need to read from and write to the "./files" directory to ensure persistence on the mounted volume. This includes images (e.g., PNG, JPEG) and other files (e.g., text, JSON, binaries). Example: ```js import fs from "fs/promises"; await fs.writeFile("./files/hello.txt", "Hello world!"); console.log("Saved ./files/hello.txt"); ```

Manual installation

You can install the MCP server using:

Installation for

Node.js Sandbox

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