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This repository hosts libraries to communicate with Ledger Nano / Nano S / Blue applications. There are implementations for Node and Browser.

Published Packages

Package	Version	Description
create-dapp		Ledger DApp Ethereum starter kit
@ledgerhq/web3-subprovider		web3 subprovider implementation for web3-provider-engine
Apps
@ledgerhq/hw-app-eth		Ethereum Application API
@ledgerhq/hw-app-btc		Bitcoin Application API
@ledgerhq/hw-app-xrp		Ripple Application API
@ledgerhq/hw-app-str		Stellar Application API
@ledgerhq/hw-app-ada		Cardano ADA Application API
Transports
@ledgerhq/hw-transport-node-hid		Node implementation of the communication layer, using node-hid (USB)
@ledgerhq/hw-transport-u2f		Web implementation of the communication layer, using U2F api
@ledgerhq/react-native-hw-transport-ble		BLE bluetooth for react-native communication layer
@ledgerhq/react-native-hid		USB hid for react-native communication layer
@ledgerhq/hw-transport-http		communicate to the device over HTTP. NB: DEV & testing purpose only. DO NOT use in PROD
@ledgerhq/hw-transport		The generic interface of the communication layer
Development Tools
@ledgerhq/hw-http-proxy-devserver		HTTP server proxy to use with hw-transport-node-hid NB: DEV & testing purpose only. DO NOT use in PROD
@ledgerhq/hw-hid-cli		CLI utility to send APDU to the device via node-hid
@ledgerhq/hw-transport-mocker		Tool used for test to record and replay APDU calls.

Examples

Basic example:

import Transport from "@ledgerhq/hw-transport-node-hid";
// import Transport from "@ledgerhq/hw-transport-u2f"; // for browser
import AppBtc from "@ledgerhq/hw-app-btc";
const getBtcAddress = async () => {
  const transport = await Transport.create();
  const btc = new AppBtc(transport);
  const result = await btc.getWalletPublicKey("44'/0'/0'/0/0");
  return result.bitcoinAddress;
};
getBtcAddress().then(a => console.log(a));

When using in a browser, make sure to set up "Browser mode" in the application settings on the device if available.

More advanced examples:

• TODO

Documentation

• API doc

Contributing

Please read our contribution guidelines before getting started.

You need to have a recent Node.js and Yarn installed.

Install dependencies

yarn

Build

Build all packages

yarn build

Watch

Watch all packages change. Very useful during development to build only file that changes.

yarn watch

Lint

Lint all packages

yarn lint

Run Tests

First of all, this ensure the libraries are correctly building, and passing lint and flow:

yarn test

then to test on a real device...

Plug a device like the Nano S and open Bitcoin app.

Then run the test and accept the commands on the devices for the tests to continue.

yarn test-node

You can also test on the web:

yarn test-browser

make sure to configure your device app with "Browser support" set to "YES".

Deploy

Checklist before deploying a new release:

• you have the right in the LedgerHQ org on NPM
• you have run npm login once (check npm whoami)
• Go to master branch
  • your master point on LedgerHQ repository (check with git config remote.$(git config branch.master.remote).url and fix it with git branch --set-upstream master origin/master)
  • you are in sync (git pull) and there is no changes in git status
• Run yarn once, there is still no changes in git status

deploy a new release

 yarn run publish

then, go to /releases and create a release with change logs.

alternatively:

deploy a canary release (beta, etc)

 yarn run publish -- -c beta

NB: if there is a new package, AFAIK you need to manually npm publish it once on NPM.