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Node Code Sandbox MCP

alfonsograziano/node-code-sandbox-mcp

Node.js server implementing the Model Context Protocol (MCP) for running arbitrary JavaScript in ephemeral Docker containers with on‑the‑fly npm dependency installation.

View on GitHub10

Install

docker run -i --rm -v /var/run/docker.sock:/var/run/docker.sock -v $HOME/Desktop/sandbox-output:/root -e FILES_DIR=$HOME/Desktop/sandbox-output -e SANDBOX_MEMORY_LIMIT=512m -e SANDBOX_CPU_LIMIT=0.75 mcp/node-code-sandbox

Client configuration

{
  "mcpServers": {
    "js-sandbox": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-v",
        "/var/run/docker.sock:/var/run/docker.sock",
        "-v",
        "$HOME/Desktop/sandbox-output:/root",
        "-e",
        "FILES_DIR=$HOME/Desktop/sandbox-output",
        "-e",
        "SANDBOX_MEMORY_LIMIT=512m",
        "-e",
        "SANDBOX_CPU_LIMIT=0.75",
        "mcp/node-code-sandbox"
      ]
    }
  }
}

Environment variables

FILES_DIRSANDBOX_MEMORY_LIMITSANDBOX_CPU_LIMIT
GitHub stars
10
Author
@alfonsograziano
Category
Virtualization, Developer Tools
License
MIT
Updated
Oct 6, 2026

Features

  • Start and manage isolated Node.js sandbox containers

  • Execute arbitrary shell commands inside containers

  • Install specified npm dependencies per job

  • Run ES module JavaScript snippets and capture stdout

  • Tear down containers cleanly

  • Detached Mode: Keep the container alive after script execution (e.g. for long-running servers)

Tools (6)

  • run_js_ephemeral

    Run a one-off JS script in a brand-new disposable container.

  • sandbox_initialize

    Start a fresh sandbox container.

  • sandbox_exec

    Run shell commands inside the running sandbox.

  • run_js

    Install npm dependencies and execute JavaScript code.

  • sandbox_stop

    Terminate and remove the sandbox container.

  • search_npm_packages

    Search for npm packages by a search term and get their name, description, and a README snippet.

Details on this page are taken from the project's README. Open README

Supported clients

Clients mentioned in this server's README:

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VS Code integrates MCP with GitHub Copilot through agent mode, allowing direct interaction with MCP-provided tools in your agentic coding workflow. Configure servers in Claude Desktop, workspace, or user settings, with guided MCP installation and secure handling of secrets in input variables to avoid leaking hardcoded keys.

WindowsMacOSLinuxWeb

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