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Storage adapters provide persistent storage for wallet data across different platforms. For production use, always configure a persistent adapter rather than the default in-memory store.

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Overview

By default, the Arkade SDK uses InMemoryStorageAdapter which stores data in memory and loses it when the application restarts. For production applications, you should use a persistent storage adapter appropriate for your environment.

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Available Storage Adapters

LocalStorage

Browser/PWA persistent storage using localStorage API

IndexedDB

Browser/PWA/Service Worker advanced storage with IndexedDB

AsyncStorage

React Native persistent storage

FileSystem

Node.js file-based storage

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Storage Adapter Interface

All storage adapters implement the same interface: 
interface StorageAdapter {
  getItem(key: string): Promise<string | null>
  setItem(key: string, value: string): Promise<void>
  removeItem(key: string): Promise<void>
  clear(): Promise<void>
}

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Browser LocalStorage

For browser applications, use LocalStorageAdapter for simple persistent storage: 
import { Wallet, MnemonicIdentity } from '@arkade-os/sdk'
import { LocalStorageAdapter } from '@arkade-os/sdk/adapters/localStorage'
import { generateMnemonic } from '@scure/bip39'
import { wordlist } from '@scure/bip39/wordlists/english'

const storage = new LocalStorageAdapter()

// Load or create identity
let mnemonic = await storage.getItem('mnemonic')
if (!mnemonic) {
  mnemonic = generateMnemonic(wordlist)
  await storage.setItem('mnemonic', mnemonic)
}

const identity = MnemonicIdentity.fromMnemonic(mnemonic)

const wallet = await Wallet.create({
  identity,
  arkServerUrl: 'https://arkade.computer',
  storage
})

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Browser IndexedDB

For more advanced browser applications or service workers, use IndexedDBStorageAdapter: 
import { Wallet, MnemonicIdentity } from '@arkade-os/sdk'
import { IndexedDBStorageAdapter } from '@arkade-os/sdk/adapters/indexedDB'

const storage = new IndexedDBStorageAdapter('my-app', 1)

// Load identity from storage
const mnemonic = await storage.getItem('mnemonic')
const identity = MnemonicIdentity.fromMnemonic(mnemonic)

const wallet = await Wallet.create({
  identity,
  arkServerUrl: 'https://arkade.computer',
  storage
})
IndexedDB is recommended for service workers and applications that need to store large amounts of data.

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React Native AsyncStorage

For React Native applications, use AsyncStorageAdapter: 
import { Wallet, MnemonicIdentity } from '@arkade-os/sdk'
import { AsyncStorageAdapter } from '@arkade-os/sdk/adapters/asyncStorage'

const storage = new AsyncStorageAdapter()

// Load identity from storage
const mnemonic = await storage.getItem('mnemonic')
const identity = MnemonicIdentity.fromMnemonic(mnemonic)

const wallet = await Wallet.create({
  identity,
  arkServerUrl: 'https://arkade.computer',
  storage
})

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Node.js FileSystem

For Node.js applications, use FileSystemStorageAdapter: 
import { Wallet, MnemonicIdentity } from '@arkade-os/sdk'
import { FileSystemStorageAdapter } from '@arkade-os/sdk/adapters/fileSystem'

const storage = new FileSystemStorageAdapter('./wallet-data')

// Load identity from storage
const mnemonic = await storage.getItem('mnemonic')
const identity = MnemonicIdentity.fromMnemonic(mnemonic)

const wallet = await Wallet.create({
  identity,
  arkServerUrl: 'https://arkade.computer',
  storage
})

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Example: Identity Management

Here’s a complete example showing how to manage identity across sessions: 
import { Wallet, MnemonicIdentity } from '@arkade-os/sdk'
import { LocalStorageAdapter } from '@arkade-os/sdk/adapters/localStorage'
import { generateMnemonic } from '@scure/bip39'
import { wordlist } from '@scure/bip39/wordlists/english'

const storage = new LocalStorageAdapter()

// Try to load existing identity
let mnemonic = await storage.getItem('mnemonic')

if (!mnemonic) {
  // Create new identity
  console.log('Creating new wallet identity...')
  mnemonic = generateMnemonic(wordlist)

  // Save to storage
  await storage.setItem('mnemonic', mnemonic)
  console.log('New identity saved to storage')
} else {
  console.log('Loaded existing identity from storage')
}

const identity = MnemonicIdentity.fromMnemonic(mnemonic)

// Create wallet with persistent storage
const wallet = await Wallet.create({
  identity,
  arkServerUrl: 'https://arkade.computer',
  storage
})

const address = await wallet.getAddress()
console.log('Wallet address:', address)

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Repository Pattern

The SDK also exposes repositories for low-level data management: 
// VTXO management (automatically cached for performance)
const addr = await wallet.getAddress()
const vtxos = await wallet.walletRepository.getVtxos(addr)
await wallet.walletRepository.saveVtxos(addr, vtxos)

// Contract data for SDK integrations
await wallet.contractRepository.setContractData('my-contract', 'status', 'active')
const status = await wallet.contractRepository.getContractData('my-contract', 'status')

// Collection management for related data
await wallet.contractRepository.saveToContractCollection(
  'swaps',
  { id: 'swap-1', amount: 50000, type: 'reverse' },
  'id' // key field
)
const swaps = await wallet.contractRepository.getContractCollection('swaps')

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Next Steps