Simple Nano client for node.js and browser

A simplified client for the Nano cryptocurrency. This library aims to support the most general use-cases for interacting with the nano network. This be to update an account, list transactions and to send funds.

You can also check out Nano Ping over at examples for a sample implementation with this library.

Install

Add with yarn or npm:

$ yarn add @nanobox/nano-client

Usage

To create the client:

import { NanoClient } from "@nanobox/nano-client";

const client = new NanoClient({
    url: "https://api.nanobox.cc", // Or any other node url
    // Basic auth if the Node or proxy requires this
    // credentials: { username: 'username', password: 'password' }
})

Receive nano funds

To receive nano, we need an address, public key and private key to sign a receive block (the block is signed locally). For testing purposes this can be generated over at Nano Tools or any similar tool. There's also a convenient method in the client itself to generate a wallet: client.generateWallet(). A wallet will be used to derive new accounts.

To receive Nano, first ensure that there exists a pending block for the account by sending a small amount of Nano to the address.

const account = {
    address: "nano_.....", // Replace with YOUR address here
    publicKey: "public-key", // Replace with YOUR public key
    privateKey: "private-key", // Replace with YOUR private key
    balance: NANO.ZERO // Balance will be updated on receive/send
}

// Updates account to latest state, this will automatically process receive blocks
const accountAfterReceive = await client.update(account)

Limit number of receives processed

It's possible to specify number of receives to process by the client. Typically, to avoid loading for too long.

const accountAfterReceive = await client.update(account, 1)

Sending

To send your newly received nano:

// We re-use the account created in the previous section
const accountAfterSend = await client.send(account, 'nano_3ktybzzy14zxgb6osbhcc155pwk7osbmf5gbh5fo73bsfu9wuiz54t1uozi1', NANO.fromNumber(0.001))
// accountAfterSend now has balance subtracted sent amount

Send max

There's a utility function to send all funds from an account to an address:

const accountAfterSend = await client.sendMax(account)
// accountAfterSend now has balance: 0

Change representative

To change representative for an account:

// We re-use the account created in the previous section
account.representative = 'nano_.....'
await client.setRepresentative(account)

Websockets

There is preliminary websockets support, namely for listening on send and receive events for a given (or multiple) accounts:

Setup

To be able to use websockets, create the client with a websockets url:

const client = new NanoClient({
    // ... other options
    websocketUrl: 'wss://ws.nanobox.cc'
})

To listen for receive events (address that received nano)

client.onReceive('nano_34prihdxwz3u4ps8qjnn14p7ujyewkoxkwyxm3u665it8rg5rdqw84qrypzk', received => {
    // Prints receive information
    console.log(s)
})

To listen for send events (address that sent nano)

client.onSend('nano_34prihdxwz3u4ps8qjnn14p7ujyewkoxkwyxm3u665it8rg5rdqw84qrypzk', sent => {
    // Prints sent information
    console.log(s)
})