Setup

What is the DMK?

This package contains the core of the Device Management Kit (DMK). It provides a simple interface to handle Ledger devices and features the Device Management Kit’s entry points, classes, types, structures, and models.

Installation

Add the DMK to your project with this command:


npm install @ledgerhq/device-management-kit

Browser Compatibility

This library is compatible with any browser that supports the WebHID API .

Understanding RxJS: A Quick Primer

The DMK uses RxJS to handle asynchronous operations. If you’re new to RxJS, here’s what you need to know:

Observables: Most DMK functions return “Observables” instead of Promises
Subscription: You need to “subscribe” to an Observable to get its data

Basic example:


dmk.someFunction().subscribe({
  next: (data) => console.log("Data received:", data),
  error: (error) => console.error("Error:", error),
  complete: () => console.log("Operation completed"),
});

What’s Next?

Now that you have the DMK installed, proceed to the next guide to learn how to initialize it in your application.