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Quick Start/
Use Modules From Any Technology

Use Modules From Any Technology

Your stack:

Goal

Use a module from any supported technology directly in a JavaScript service with Graftcode - no REST wrapper, no rewrite, no custom interop. In this tutorial we use a Python module as the example.

What You'll See

  • Install a module from another technology as a strongly-typed Graft using npm - just like any other package.
  • Configure the generated client to point at the in-memory host.
  • Import and call it from your JavaScript code as if it were a native npm module.

Prerequisites

Step 1. Create a project folder

Create a new folder and initialize a Node.js project:

mkdir js-python-module-demo
cd js-python-module-demo
npm init -y

Step 2. Install a module from another technology

For this example we'll use a Python currency converter from PyPI (sdncenter-currency-converter), but the same approach works with any module from a supported repository - npm, PyPI, Maven or NuGet.

hypertube-nodejs-sdk is still required for this example today, but that extra step is temporary.

npm install hypertube-nodejs-sdk
npm install hypertube-binaries
npm install --registry https://grft.dev/ @graft/pypi-sdncenter-currency-converter
python -m pip install sdncenter-currency-converter --target ./

npm install --registry https://grft.dev/ @graft/pypi-sdncenter-currency-converter installs a Graft - a strongly-typed JavaScript client generated from the module. You import and call it like any other npm package, regardless of which technology the module was originally written in.

The pip install command installs the Python package to your Python environment, which Graftcode uses to execute the module in-process.

Step 3. Set the SDK key

Set the HYPERTUBE_KEY environment variable in your terminal before running the project:

PowerShell:

$env:HYPERTUBE_KEY="Fe2w-p2GK-Mn26-j8ZY-Xe25"

Bash (macOS / Linux):

export HYPERTUBE_KEY="Fe2w-p2GK-Mn26-j8ZY-Xe25"

Windows CMD:

set HYPERTUBE_KEY=Fe2w-p2GK-Mn26-j8ZY-Xe25

Step 4. Call the cross-language module and run it

Create index.js:

const { GraftConfig, SimpleCurrencyConverter } = require("@graft/pypi-sdncenter-currency-converter");

GraftConfig.host = "inMemory";

(async () => {
  const result = await SimpleCurrencyConverter.convert(100, "USD", "EUR");
  console.log("Converted amount:", result);
})();

Run it:

node index.js

You should see the converted amount printed in your terminal. SimpleCurrencyConverter.convert(...) comes from a Python package, but your code reads like a regular method call - no HTTP request, no response parsing, no serialization. GraftConfig.host = "inMemory" tells Graftcode to load and execute the Python module inside the same process.

Step 5. Run with a Project Key (recommended for real-world usage)

Everything above works without any account - perfect for learning and local development. When you're ready for real-world usage, create a free account at portal.graftcode.com, set up a project, and copy its Project Key.

With a Project Key, point GraftConfig.host at your project's stable registry URL instead of a raw WebSocket address. A Project Key gives you:

  • Stable registry URL - the address for your Grafts stays permanent, so install commands don't change when you redeploy.
  • Portal visibility - see all your gateways and services in one place at gateways.graftcode.com.
  • Access control - decide who can download your Grafts using package manager authentication and permissions.

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