sdk-dapp

A library that holds the core functional logic of a dapp on the MultiversX blockchain

See Dapp template for live demo or checkout usage in the Github repo

Installation

The library can be installed via npm or yarn.

npm install @multiversx/sdk-dapp

or

yarn add @multiversx/sdk-dapp

If you need only the sdk-dapp basic logic, without the additional UI, consider using the --no-optional flag. This will not install the packages needed for the optional UI components.

npm install @multiversx/sdk-dapp --no-optional

or

yarn add @multiversx/sdk-dapp --no-optional

If you're transitioning from dapp-core 1.x to @multiversx/sdk-dapp (dapp-core 2.0), please read the Migration guide

As of @multiversx/sdk-dapp@2.28.0 Node >=18 is required since Node 16 reached its EOL.

Usage

sdk-dapp aims to abstract and simplify the process of interacting with users' wallets and with the MultiversX blockchain, allowing developers to easily get started with a new application or integrate sdk-dapp into an existing application.

This library covers two main areas: User Identity and Transactions. The API for interacting with library's logic is exposed via hooks and methods that can be called for logging in the user, getting the status of the user or sending transactions.

However, to simplify usage even further, the library also comes with a default UI that already uses these hooks and methods under the hood. These UI elements can be easily customized with custom css classes.

The default UI is exposed via the UI module.

import * as DappUI from "@multiversx/sdk-dapp/UI";

Please be aware that this style of importing might also import unused code.

To reduce the amount of dead code, you can use named imports for each component like

import { UnlockPage } from '@multiversx/sdk-dapp/UI/pages';
or;
import { UnlockPage } from '@multiversx/sdk-dapp/UI/pages/UnlockPage';

Prerequisites

There are a couple of requirements that need to be met for the application to work properly.

If you experience bugs, please make sure that you read these, before opening an issue

React

This library was built for applications that use React, it might not be suitable for usage with other libraries or frameworks.

DappProvider

You need to wrap your application with the DappProvider component, which is exported by the library, as we need to create a global Context to be able to manipulate the data.

import the Provider:

import { DappProvider } from '@multiversx/sdk-dapp/wrappers/DappProvider';
or;
import { DappProvider } from '@multiversx/sdk-dapp/wrappers';

Wrap your application with this Provider.

<DappProvider
    environment="devnet"
    customNetworkConfig={customNetworkConfig} // optional
    dappConfig={dappConfig} // optional
>

environment is a required key that is needed to configure the app's endpoints for a specific environment. Accepted values are testnet, devnet and mainnet (also configured in EnvironmentsEnum)

DappProvider also accepts an optional customNetworkConfig object with a couple of keys. This allows using different APIs and different connection providers to configure your network configuration.

All keys are optional

{
  id?: string;
  name?: string;
  egldLabel?: string;
  decimals?: string;
  digits?: string;
  gasPerDataByte?: string;
  walletConnectDeepLink?: string; // a string that will create a deeplink for an application that is used on a mobile phone, instead of generating the login QR code.
  walletConnectV2ProjectId?: string; // a unique ProjectID needed to access the WalletConnect 2.0 Relay Cloud
  walletAddress?: string;
  apiAddress?: string;
  explorerAddress?: string;
  apiTimeout?: 4000;
}

DappProvider also accepts an optional dappConfig object.

{
  logoutRoute?: string;  // a route to redirect after auto-logout (session expired, native auth token expired or idle app)
}

UI Wrappers

The library exposes a couple of Components that are connected to the redux store and are used to display various elements when something happens inside the app:

TransactionsToastList will display new transactions in nice toasts at the bottom of the screen. This component is fully customizable.

  import {TransactionsToastList} from "@multiversx/sdk-dapp/UI/TransactionsToastList";

  // all properties are optional
  <TransactionsToastList
    className = 'transactions-toast-list'
    transactionToastClassName="transactions-toast-class"
    successfulToastLifetime={30000}
    parentElement={
      /*
        React NodeElement where the toast will be rendered
        */
    }
  />

SignTransactionsModals will show a modal when a new transaction is submitted, prompting the user to verify and sign it.

Important! This is required to make transactions work, except when you use hooks to sign the transactions manually (more on this below).

import { SignTransactionsModals } from '@multiversx/sdk-dapp/UI/SignTransactionsModals';

<App>
  <SignTransactionsModals />
  <Content />
</App>;

NotificationModal Will show a modal to the user with various warnings and errors.

import { NotificationModal } from '@multiversx/sdk-dapp/UI/NotificationModal';

<App>
  <NotificationModal />
  <Content />
</App>;

If you want to show custom notifications, you can use the useGetNotification hook to get the notifications (like insufficient funds, errors etc).

User Identity

sdk-dapp makes logging in and persisting user's session easy and hassle-free.

A handy component is AuthenticatedRoutesWrapper, which can be used to protect certain routes and redirect the user to login page if the user is not authenticated.

Import from sdk-dapp:

import { AuthenticatedRoutesWrapper } from '@multiversx/sdk-dapp/wrappers/AuthenticatedRoutesWrapper';
or;
import { AuthenticatedRoutesWrapper } from '@multiversx/sdk-dapp/wrappers';

Use with routes:

<AuthenticatedRoutesWrapper routes={routes} unlockRoute='/unlock'>
  {appContent}
</AuthenticatedRoutesWrapper>

routes should be an array with objects with a signature similar to this:

{
    path: "/dashboard",
    title: "Dashboard",
    component: Dashboard,
    authenticatedRoute: true,
  }

The important parts that makes this component work are the flag authenticatedRoute: true and the key path, which means that this route should be accessible only to authenticated users.

Login UI

There are a couple of very handy React components that can be used to login the user and protect certain routes if the user is not logged in.

Under the DappUI object mentioned above, you can find 4 buttons (one for each provider) which abstract away all the logic of loggin in the user and render the default UI. These buttons can be easily customized with a custom css class. The exported buttons are:

ExtensionLoginButton
WalletConnectLoginButton
LedgerLoginButton
WebWalletLoginButton

example:

<ExtensionLoginButton
  callbackRoute='/dashboard'
  buttonClassName='extension-login'
  loginButtonText='Extension login'
/>

They can also be used with children

<ExtensionLoginButton
  callbackRoute="/dashboard"
  buttonClassName="extension-login"
  loginButtonText="Extension login"
>
  <>
    <icon/>
    <p>Login text</p>
  <>
</ExtensionLoginButton>

WalletConnectLoginButton and LedgerLoginButton will trigger a modal with a QR code and the ledger login UI, respectively. These are automatically triggered by the buttons.

If, however, you want access to these containers without the buttons, you can easily import and use them.

<WalletConnectLoginContainer
  callbackRoute={callbackRoute}
  loginButtonText='Login with xPortal'
  title='xPortal Login'
  className='wallect-connect-login-modal'
  lead='Scan the QR code using xPortal'
  wrapContentInsideModal={wrapContentInsideModal}
  redirectAfterLogin={redirectAfterLogin}
  token={token}
  onLoginRedirect={onLoginRedirect}
  onClose={onClose}
/>

<LedgerLoginContainer
  callbackRoute={callbackRoute}
  className='ledger-login-modal'
  wrapContentInsideModal={wrapContentInsideModal}
  redirectAfterLogin={redirectAfterLogin}
  nativeAuth
  onClose={onClose}
  onLoginRedirect={onLoginRedirect}
/>

<WebWalletLoginButton
  callbackRoute="/dashboard"
  loginButtonText="Web Wallet login"
>

If you have a custom Web Wallet provider you can integrate it by using the customWalletAddress prop:

<WebWalletLoginButton
  callbackRoute="/dashboard"
  loginButtonText="Custom Web Wallet login"
  customWalletAddress="https://custom-web-wallet.com"
>

All login buttons and hooks accept a prop called redirectAfterLogin which specifies of the user should be redirected automatically after login. The default value for this boolean is false, since most apps listen for the "isLoggedIn" boolean and redirect programmatically.

If you need to authenticate some requests, you can provide the nativeAuth flag to your login buttons. It comes as a boolean or as a configuration object. This token will be available in useGetLoginInfo hook later, inside tokenLogin.nativeAuthToken. If you need to use an interceptor for your requests, make sure to check out the implementation of AxiosInterceptorContext. Use it like:

import { AxiosInterceptorContext } from '@multiversx/sdk-dapp/wrappers/AxiosInterceptorContext';

<AxiosInterceptorContext.Provider>
  <AxiosInterceptorContext.Interceptor
    authenticatedDomanis={['https://my-api.com']}
  >
    <Router>
      <DappProvider environment={EnvironmentsEnum.devnet}>
        <>
          <AxiosInterceptorContext.Listener />
          {/*
              // other components below
              */}
          <TransactionsToastList />
          <NotificationModal />
          <SignTransactionsModals />

          <Routes>...</Routes>
        </>
      </DappProvider>
    </Router>
  </AxiosInterceptorContext.Interceptor>
</AxiosInterceptorContext.Provider>

Another handly component is AuthenticatedRoutesWrapper, which can be used to protect certain routes and redirect the user to login page if the user is not authenticated.

Import from sdk-dapp:

import { AuthenticatedRoutesWrapper } from '@multiversx/sdk-dapp/wrappers/AuthenticatedRoutesWrapper';

Use with routes:

<AuthenticatedRoutesWrapper routes={routes} unlockRoute={routeNames.unlock}>
  {appContent}
</AuthenticatedRoutesWrapper>

routes should be an array with objects with a signature similar to this:

{
    path: "/dashboard",
    title: "Dashboard",
    component: Dashboard,
    authenticatedRoute: true,
  }

The important parts that makes this component work are the flag authenticatedRoute: true and the key path, which means that this route should be accessible only to authenticated users.

Login hooks

This area covers the login hooks, which expose a trigger function and the login data, ready to be rendered.

These hooks are exposed as named exports, which can be imported from sdk-dapp:

import {
  useExtensionLogin,
  useWalletConnectV2Login,
  useLedgerLogin,
  useWebWalletLogin
} from '@multiversx/sdk-dapp/hooks';
or;
import { useExtensionLogin } from '@multiversx/sdk-dapp/hooks/login/useExtensionLogin';
import { useWalletConnectV2Login } from '@multiversx/sdk-dapp/hooks/login/useWalletConnectV2Login';
import { useLedgerLogin } from '@multiversx/sdk-dapp/hooks/login/useLedgerLogin';
import { useWebWalletLogin } from '@multiversx/sdk-dapp/hooks/login/useWebWalletLogin';

There are 4 available hooks:

useExtensionLogin
useWalletConnectV2Login
useLedgerLogin
useWebWalletLogin

All hooks have the same response signature:

return type is as follows:

const [initiateLogin, genericLoginReturnType, customLoginReturnType] =
  useLoginHook({
    callbackRoute,
    token,
    nativeAuth,
    onLoginRedirect
  });

initiateLogin is a function that needs to be called for the login flow to be initiated;
genericLoginReturnType is an object that is exactly the same for all hooks:

{
  error: string,
  loginFailed: boolean,
  isLoading: boolean,
  isLoggedIn: boolean
}

customLoginReturnType is an object that is custom for each hook and returns specific data for that login:
- null for useExtensionLogin;
- null for useWebWalletLogin;
- { uriDeepLink: string, qrCodeSvg: svgElement } for useWalletConnectV2Login;

{
  accounts: string[];
  showAddressList: boolean;
  startIndex: number;
  selectedAddress: SelectedAddress | null;
  onGoToPrevPage: () => void;
  onGoToNextPage: () => void;
  onSelectAddress: (address: SelectedAddress | null) => void;
  onConfirmSelectedAddress: () => void;
}

for useLedgerLogin;

Reading User State

Once logged in, the user's session is persisted and can be read and deleted via a couple of handy functions.

For logging out, the library exposes a simple function called logout, which can be called to clear the user data.

the function accepts 2 arguments:

callbackUrl: string (optional) the url to redirect the user to after logging him out
onRedirect: (callbackUrl: string) => void (optional) a function that will be called instead of redirecting the user. This allows you to control how the redirect is done, for example, with react-router-dom, instead of window.location.href assignment. Important this function will not be called for web wallet logout

You can opt-in for using the useIdleTimer hook, which logs out the user after a period of inactivity (default set to 10 minutes). Optionally it accepts an onLogout function that fulfills your dapp's specific logout business logic. Make sure to call the above logout function inside this onLogout callback.

You can also opt-in for using the useRegisterWebsocketListener hook. The hooks accepts a callback which will get fired once a websocket message is received, receiving the string argument provided by the event. Optionally you can simply listen to changes on account/transactions with the useGetWebsocketEvent hook.

There are 2 ways of reading the user current state: hooks (to be used inside components and for reacting to changes in the data) and simple functions (for reading data outside of React components or inside handlers).

hooks: useGetLoginInfo, useGetAccountInfo, useGetNetworkConfig, useGetWebsocketEvent;
functions: getAccount, getAccountBalance, getAccountShard, getAddress, getIsLoggedIn;

Transactions

The sdk-dapp library exposes a straight-forward way of sending transactions and tracking their status, with a couple of handy UI components;

Sending Transactions

The API for sending transactions is a function called sendTransactions:

import { sendTransactions } from "@multiversx/sdk-dapp";

It can be used to send a transaction with minimum information:

const { sessionId, error } = await sendTransactions({
    transactions: [
        {
          value: '1000000000000000000',
          data: 'ping',
          receiver: contractAddress
        },
      ],
    callbackRoute?: string // (optional, defaults to window.location.pathname) the route to be redirected to after signing. Will not redirect if the user is already on the specified route;
    transactionsDisplayInfo: TransactionsDisplayInfoType // (optional, default to null) custom message for toasts texts;
    minGasLimit?: number (optional, defaults to 50_000);
    sessionInformation?: any (optional, defaults to null) extra sessionInformation that will be passed back to you via getSignedTransactions hook;
    signWithoutSending?: boolean // (optional, defaults to false), the transaction will be signed without being sent to the blockchain;
    completedTransactionsDelay?: number // delay the transaction status from going into "successful" state;
    redirectAfterSigning?: boolean // (optional, defaults to true), whether to redirect to the provided callbackRoute;
    });

It returns a Promise that will be fulfilled with {error?: string; sessionId: string | null;}

sessionId is the transaction's batch id which can be used to track a transaction's status and react to it.

Important! For the transaction to be signed, you will have to use either SignTransactionsModals defined above, in the Prerequisites section, or the useSignTransactions hook defined below. If you don't use one of these, the transactions won't be signed

Sending sync transactions in batches (batch transactions mechanism)

Sending transactions synchronously in batches

The API for sending sync transactions is a function called sendBatchTransactions:

import { sendBatchTransactions } from "@multiversx/sdk-dapp/services/transactions/sendBatchTransactions";

It can be used to send a group of transactions (that ca be synchronized) with minimum information:

const { batchId, error } = await sendBatchTransactions({
    transactions: [
      [
        {
          value: '1000000000000000000',
          data: 'tx1',
          receiver: receiverAddress
        },
      ],
      [
        {
          value: '1000000000000000000',
          data: 'tx2',
          receiver: receiverAddress
        },
        {
          value: '1000000000000000000',
          data: 'tx3',
          receiver: receiverAddress
        },
      ]
    ],
  /**
   * the route to be redirected to after signing. Will not redirect if the user is already on the specified route
   * @default window.location.pathname
   */
  callbackRoute?: string;
  /**
   * custom message for toasts texts
   * @default null
   */
  transactionsDisplayInfo: TransactionsDisplayInfoType;
  /**
   * Minimum amount of gas in order to process the transaction.
   * @default 50_000
   */
  minGasLimit?: number (optional, defaults to 50_000);
  /**
   * Contains extra sessionInformation that will be passed back via getSignedTransactions hook
   */
  sessionInformation?: any (optional, defaults to null)
  /**
   * The transactions will be signed without being sent to the blockchain
   */
  signWithoutSending?: boolean;
  /**
   * Delay the transaction status from going into "successful" state
   */
  completedTransactionsDelay?: number;
  /**
   * If true, redirects to the provided callbackRoute
   */
  redirectAfterSigning?: boolean;
  });

It returns a Promise that will be fulfilled with {error?: string; batchId: string | null;}

batchId is the transactions' batch id used to send the batch to the batch service and to track the transactions status and react to it. This is composed by the sessionId (received after signing) and the user address. Eg. 12123423123-erd1address....
error is the error that can appear during the signing/sending process.

How to synchronize transactions ?

sendBatchTransactions accepts an argument transactions which is an array of transactions arrays. Each transaction array will be sent to the blockchain in the order they are provided. Having the example above, the transactions will be sent in the following order:

tx1
tx2, tx3

tx1 will be sent first, waits until is completed, then tx2 and tx3 will be sent in parallel. This means that the groups are sent synchronously, but the transactions inside a group are sent in parallel.

** Important! This function will send the transactions automatically in batches, based on the provided transactions array, immediately after signing. If you do not want them to be sent automatically, but on demand, then you should use send callback exposed by the useSendBatchTransactions hook. Be sure to save the sessionId passed to the batch. We recommend to generate a new sessionId like this: Date.now().toString(); **

import { sendBatchTransactions } from '@multiversx/sdk-dapp/services/transactions/sendBatchTransactions';
import { useSendBatchTransactions } from '@multiversx/sdk-dapp/hooks/transactions/batch/useSendBatchTransactions';

const { send: sendBatchToBlockchain } = useSendBatchTransactions();

// Use signWithoutSending: true to sign the transactions without sending them to the blockchain
sendBatchTransactions({
  transactions,
  signWithoutSending: true,
  callbackRoute: window.location.pathname,
  redirectAfterSign: true
});

const { error, batchId, data } = await sendBatchToBlockchain({
  transactions,
  sessionId
});

Important! For the transaction to be signed, you will have to use either SignTransactionsModals defined above, in the Prerequisites section, or the useSignTransactions hook defined below. If you don't use one of these, the transactions won't be signed

Transaction Signing Flow

Once a transaction has been submitted, you have to use either the SignTransactionsModals or the useSignTransactions hook, for the user to be prompted in his provider (Extension, xPortal App etc) to sign the transaction.

If you don't want to use the default modals that appear for the user when the signing process happens, you have to use the useSignTransactions hook to sign those transactions.

const {
  callbackRoute,
  transactions,
  error,
  sessionId,
  onAbort,
  hasTransactions,
  canceledTransactionsMessage
} = useSignTransactions();

This hook will let you know if there are any transactions and you can programmatically abort the signing process.

We suggest displaying a message on the screen that confirms the transaction that needs to be signed.

You can also get the provider via

const { providerType, provider } = useGetAccountProvider();

and use that to display an appropriate message to the user.

For ledger, signing a transaction is simple if you're using the SignTransactionsModal component.

It is fully customizable and will take care of walking the user through the signing flow.

If, however, you want to implement a different experience, you will have to use the useSignTransactionsWithLedger hook.

it accepts the following props:

{
  onCancel: () => void;
}

and returns an object with the following keys:

{
  onSignTransaction: () => void;
  onNext: () => void;
  onPrev: () => void;
  waitingForDevice: boolean;
  onAbort: (e: React.MouseEvent) => void;
  isLastTransaction: boolean;
  currentStep: number;
  signedTransactions?: Record<string, Transaction>;
  currentTransaction: {
      transaction: Transaction;
      transactionTokenInfo: {
          tokenId: string;
          amount: string;
          receiver: string;
          type?: string;
          nonce?: string;
          multiTxData?: string;
      };
      isTokenTransaction: boolean;
      tokenDecimals: number;
      dataField: string;
  };
  }

Tracking a transaction

The library has a built-in implementation for tracking the transactions sent normally or synchronously via batch transactions. Also, exposes a hook called useTrackTransactionStatus;

1. Built-in tracking

There is a TransactionTracker component that is used to track transactions. It is used by default in the DappProvider component. This component is using the useTransactionsTracker and useBatchTransactionsTracker hooks to track the transactions.

useTransactionsTracker - track transactions sent normally useBatchTransactionsTracker track batch transactions

The developers are be able to create their own implementation for the transaction tracking component (using these hooks or creating their own logic) and pass it to the DappProvider component through customComponents field.

import { TransactionsTracker } from "your/module";
<DappProvider
  environment={environment}
  customNetworkConfig={{
    name: 'customConfig',
    apiTimeout,
    walletConnectV2ProjectId
  }}
  customComponents={{
    transactionTracker: {
      component: TransactionsTracker,
      props: {
        onSuccess: (sessionId) => {
          console.log(`Session ${sessionId} successfully completed`);
        },
        onFail: (sessionId, errorMessage) => {
          if (errorMessage) {
            console.log(`Session ${sessionId} failed, ${errorMessage}`);
            return;
          }

          console.log(`Session ${sessionId} failed`);
        }
      }
    }
  }}
>

The props passed to the TransactionsTracker component are:

export interface TransactionsTrackerType {
  getTransactionsByHash?: GetTransactionsByHashesType;
  onSuccess?: (sessionId: string | null) => void;
  onFail?: (sessionId: string | null, errorMessage?: string) => void;
}

Also, the same props can be passed to the useTransactionsTracker and useBatchTransactionsTracker hooks.

import { useBatchTransactionsTracker } from 'hooks/transactions/batch/tracker/useBatchTransactionsTracker';
import { useTransactionsTracker } from 'hooks/transactions/useTransactionsTracker';

const props = {
  onSuccess: (sessionId) => {
    console.log(`Session ${sessionId} successfully completed`);
  },
  onFail: (sessionId, errorMessage) => {
    if (errorMessage) {
      console.log(`Session ${sessionId} failed, ${errorMessage}`);
      return;
    }

    console.log(`Session ${sessionId} failed`);
  }
};

useTransactionsTracker(props);
useBatchTransactionsTracker(props);

The transactions trackers will automatically update the transactions statuses in the store. This functionality is used by the TransactionToastList component to display the transactions statuses.

2. Tracking transaction status

import {useTrackTransactionStatus} from @multiversx/sdk-dapp/hooks;

const transactionStatus = useTrackTransactionStatus({
  transactionId: sessionId,
  onSuccess,
  onFail,
  onCancelled,
});

transactionStatus has the following information about the transaction:

{
  isPending,
    isSuccessful,
    isFailed,
    isCancelled,
    errorMessage,
    status,
    transactions;
}

It's safe to pass in null as a sessionId, so if the transaction wasn't yet sent, the hook will just return an empty object.

Tracking transactions' statuses

sdk-dapp also exposes a number of handy hooks for tracking all, pending, failed, successful and timed out transactions.

Use:

useGetPendingTransactions to get a list of all pending transactions.
useGetSuccessfulTransactions to get a list of all successful transactions.
useGetFailedTransactions to get a list of all pending transactions.

An especially useful hook called useGetActiveTransactionsStatus will keep you updated with the status of all transactions at a certain point in time.

it's return signature is

{
  pending: boolean, // at least one transaction is pending;
  hasPendingTransactions: boolean, // the user has at least 1 pending transaction active;
  timedOut: boolean, // there are no pending transactions and at least one has timed out;
  fail: boolean, // there are no pending and no timedOut transactions and at least one has failed;
  success: boolean, // all transactions are successful and all smart contract calls have been processed successfully;
}

Transaction Toasts UI

sdk-dapp also exposes a toast component for tracking transactions that uses the above mentioned hooks and displays toasts with transactions statuses.

The toasts list is exposed via TransactionsToastList UI component and can be used just by rendering it inside the application. TransactionToastList component renders also custom toasts. A custom toast can be added using the util function: addNewCustomToast and can be removed using deleteCustomToast

When TransactionToastList is also used for displaying custom toasts, is enough to call addNewCustomToast to add new custom toast to the list;

<App>
  <Router />
  <TransactionsToastList />
</App>

Important: This has to be inside the <DappProvider/> children.

In case you don't want to use TransactionToastList and just display a custom toast, then you have to import CustomToast component

const customToast = addNewCustomToast(
  {
    toastId: 'toast-id',
    message: '',
    type: 'custom',
    duration: 2000
  }
);

<CustomToast
  {...customToast}
  onDelete: () => deleteCustomToast(toastId)
 />

Removing transactions manually

sdk-dapp takes care to change transactions' statuses and removes them when needed, but if you need to do this manually, you can use the exposed functions for this:

removeTransactionsToSign(sessionId);
removeSignedTransaction(sessionId);
removeAllTransactionsToSign();
removeAllSignedTransactions();

Unit testing with Jest

The sdk-dapp library exposes bundles for both CommonJS and ESModules, however, in some environments, Jest might require manual mapping of the CommonJS output. To implement it, add the following snippet inside your jest config file.

moduleNameMapper: {
    '@multiversx/sdk-dapp/(.*)':
      '<rootDir>/node_modules/@multiversx/sdk-dapp/__commonjs/$1.js'
},

You may need in your setupJest.js file do:

import 'isomorphic-fetch';

sdk-dapp exports

Since version 2.0, sdk-dapp does not have a default export object. You have to import everything from its own separate module. Below you can find all the exports.

You can either import everything from a module, or if you really want to make sure you're not importing anything that is not used, you can import everything from its own file.

You can either go into their specific folder in the module for extra trimming, or import everything together.

for example, these 2 imports are both valid:

import {
  useExtensionLogin,
  useGetAccountInfo
} from '@multiversx/sdk-dapp/hooks';

and

import { useExtensionLogin } from '@multiversx/sdk-dapp/hooks/login';
import { useGetAccountInfo } from '@multiversx/sdk-dapp/hooks/account';

constants exports

import {
  GAS_PRICE_MODIFIER,
  GAS_PER_DATA_BYTE,
  GAS_LIMIT,
  GAS_PRICE,
  DECIMALS,
  DIGITS,
  mnemonicWords,
  ledgerErrorCodes,
  fallbackNetworkConfigurations
} from '@multiversx/sdk-dapp/constants';

hooks exports

Login

import {
  useExtensionLogin,
  useLedgerLogin,
  useWalletConnectV2Login,
  useWebWalletLogin
} from '@multiversx/sdk-dapp/hooks/login';

Account

import {
  useGetAccount, // if you only need the account as on network
  useGetAccountInfo, // if you need all account information from store
  useGetAccountProvider,
  useGetLoginInfo,
  useGetWebsocketSignalTimestamp // get a Date.now() timestamp every time a change occurs on the account on network
} from '@multiversx/sdk-dapp/hooks/account';

Transactions

import {
  useCheckTransactionStatus,
  useGetActiveTransactionsStatus,
  useGetFailedTransactions,
  useGetPendingTransactions,
  useGetSignedTransactions,
  useGetSignTransactionsError,
  useGetSuccessfulTransactions,
  useGetTokenDetails,
  useGetTransactionDisplayInfo,
  useParseMultiEsdtTransferData,
  useParseSignedTransactions,
  useSignMultipleTransactions,
  useSignTransactions,
  useSignTransactionsWithDevice,
  useSignTransactionsWithLedger
} from '@multiversx/sdk-dapp/hooks/transactions';

Misc

import {
  useDebounce,
  useGetNetworkConfig,
  useGetNotification,
  useUpdateEffect
} from '@multiversx/sdk-dapp/hooks';

services exports

import {
  removeTransactionsToSign,
  removeSignedTransaction,
  removeAllSignedTransactions,
  removeAllTransactionsToSign,
  isCrossShardTransaction,
  sendTransactions,
  signTransactions,
  calcTotalFee
} from '@multiversx/sdk-dapp/services';

utils exports

Account

import {
  addressIsValid,
  getAccount,
  getAccountBalance,
  getAccountShard,
  getAddress,
  getLatestNonce,
  getShardOfAddress,
  refreshAccount,
  setNonce,
  signMessage
} from '@multiversx/sdk-dapp/utils/account';

Operations

import {
  calculateFeeLimit,
  formatAmount,
  nominate,
  getUsdValue
} from '@multiversx/sdk-dapp/utils/operations';

Transactions

import {
  getTokenFromData,
  isTokenTransfer,
  parseMultiEsdtTransferData,
  parseTransactionAfterSigning
} from '@multiversx/sdk-dapp/utils/transactions';

Validation

import {
  getIdentifierType,
  stringIsFloat,
  stringIsInteger,
  isContract,
  isStringBase64
} from '@multiversx/sdk-dapp/utils';

Misc

import {
  encodeToBase64,
  decodeBase64,
  logout,
  getTokenFromData,
  getIsLoggedIn,
  isSelfESDTContract,
  getAddressFromDataField
} from '@multiversx/sdk-dapp/utils';

Wrappers

import {
  DappProvider,
  AuthenticatedRoutesWrapper,
  AppInitializer
} from '@multiversx/sdk-dapp/wrappers';

Web-specific imports

import { useIdleTimer } from '@multiversx/sdk-dapp/web';

UI

import {
  CopyButton,
  FormatAmount,
  ExplorerLink,
  ExtensionLoginButton,
  LedgerLoginButton,
  LedgerLoginContainer,
  NotificationModal,
  PageState,
  ProgressSteps,
  SignTransactionsModals,
  SignWithDeviceModal,
  SignWithExtensionModal,
  SignWithLedgerModal,
  TransactionsToastList,
  TransactionToast,
  Trim,
  UsdValue,
  WalletConnectLoginButton,
  WalletConnectLoginContainer,
  WebWalletLoginButton
} from '@multiversx/sdk-dapp/UI';

or

import { CopyButton } from '@multiversx/sdk-dapp/UI/CopyButton';
import { FormatAmount } from '@multiversx/sdk-dapp/UI/FormatAmount';
import { ExplorerLink } from '@multiversx/sdk-dapp/UI/ExplorerLink';

etc;

Important: shouldRenderDefaultCss was removed from all components.

React Native support

We are aware that there are projects out there that would like to use this library to allow users to seamlessly authenticate with the xPortal App.

You can use this library for its utility functions, like "formatAmount, parseAmount", mnemonic words list or its constants.

However, certain architectural decisions that we made do not work out of the box with React Native runtime (neither Metro nor Re.pack). Due to this, you cannot yet use the DappProvider wrapping logic in a React Native application.

We have a couple of solutions in mind and are actively working on exploring ways to overcome these limitations. Until then, you can use @multiversx/erdjs libraries and @walletconnect to connect to the xPortal App. There are also guide for doing this from the community

Next.js support

If you are using Next.js, make sure to check out the README and implementation of the Next.js Template dApp.

WalletConnect 2.0 Setup

Starting with the 2.0 version of the dApp SDK ( previously @elrondnetwork/dapp-core@2.0.0 ) and @multiversx/sdk-dapp@2.2.8 WalletConnect 2.0 is available as a login and signing provider, allowing users to login by scanning a QR code with the Mobile App

This is an implementation of sdk-wallet-connect-provider ( docs ) signing provider

As a ProjectID is needed for the complete functionality, the following change is needed:

Set the `walletConnectV2ProjectId`

In the DappProvider wrapper a walletConnectV2ProjectId must be provided in the customNetworkConfig

The Project ID can be generated for free here: https://cloud.walletconnect.com/sign-in

<DappProvider
    environment="devnet"
    customNetworkConfig={{
      name: 'customConfig',
      walletConnectV2ProjectId: '9b1a9564f91...'
    }}
>

The WalletConnect Project ID grants you access to the WalletConnect Cloud Relay that securely manages communication between the device and the dApp.

If the Project ID is valid, the new functionality will work out of the box with the Transactions and Message signing flows.

Experimental features

ExperimentalWebviewProvider

Serves as an interface for communication between a dApp and a parent window within an iframe or webview context. Its primary purpose is to enable embedding the dApp in a parent window and facilitating communication with it.

Usage

The ExperimentalWebviewProvider is primarily utilized by the WebWallet Hub and the xPortal Hub. It implements all the methods of a signing provider, sending the transactions or messages to the parent window for signing.

Implementation

The parent window must implement specific methods to handle requests, such as signTransaction and signMessage. These methods are called by the ExperimentalWebviewProvider to initiate the signing process.

const handleMessages = (event: MessageEvent<RequestMessageType>) => {
  const { type, payload } = event.data;

  switch (type) {
    case CrossWindowProviderRequestEnums.loginRequest:
      // handle login request resulting in accessToken
      iframe.target.contentWindow.postMessage({
        type: CrossWindowProviderResponseEnums.loginResponse,
        payload: {
          data: {
            address,
            accessToken
          }
        },
      })
      break;
    case CrossWindowProviderRequestEnums.signTransactionsRequest:
      const transactions = payload.map((plainTransactionObject) =>
        Transaction.fromPlainObject(plainTransactionObject)
      );

      // handle transaction signing resulting in signedTransactions

      iframe.target.contentWindow.postMessage({
        type: CrossWindowProviderResponseEnums.signTransactionsResponse,
        payload: {
          data: signedTransactions
        },
      })
      break;
    case CrossWindowProviderRequestEnums.signMessageRequest:
      const messageToSign = payload?.message;

      // handle message signing resulting in signature

      windowTarget.postMessage({
        type: CrossWindowProviderResponseEnums.signMessageResponse,
        payload: {
          data: {
            signature,
            status: SignMessageStatusEnum.signed
          }
        },
      })
      break;
    default:
      // handle other message types
      break;
  }
};

window.addEventListener('message', handleMessages);

Development Status

It's important to note that the ExperimentalWebviewProvider is still under development and should be used with caution. As such, it may undergo changes or updates that could affect its functionality.

Integration Guide

For applications utilizing @multiversx/sdk-dapp and aiming to interact with the parent window, integration involves upgrading to the latest version of @multiversx/sdk-dapp and setting the iframe or webview URL. This URL should include the access token as a query parameter.

Example Integration

<iframe src="https://your-dapp.com?accessToken=yourAccessToken" />
<Webview source={{ uri: "https://your-dapp.com?accessToken=yourAccessToken" }} />

Roadmap

See the open issues for a list of proposed features (and known issues).

Contributing

Contributions are what make the open source community such an amazing place to be learn, inspire, and create. Any contributions you make are greatly appreciated.

One can contribute by creating pull requests, or by opening issues for discovered bugs or desired features.

Fork the Project
Create your Feature Branch (git checkout -b feature/AmazingFeature)
Commit your Changes (git commit -m 'Add some AmazingFeature')
Push to the Branch (git push origin feature/AmazingFeature)
Open a Pull Request

License

GPL-3.0-or-later

Name		Name	Last commit message	Last commit date
Latest commit History 3,751 Commits
.github		.github
.storybook		.storybook
config		config
scripts		scripts
src		src
.babelrc		.babelrc
.editorconfig		.editorconfig
.eslintignore		.eslintignore
.eslintrc		.eslintrc
.gitignore		.gitignore
.npmignore		.npmignore
.prettierrc		.prettierrc
.travis.yml		.travis.yml
CHANGELOG.md		CHANGELOG.md
README.md		README.md
changelog.js		changelog.js
esbuild-watch.js		esbuild-watch.js
esbuild.js		esbuild.js
executeBuildCommand.js		executeBuildCommand.js
jest.config.js		jest.config.js
link-mx-sdk-js-hw-provider.sh		link-mx-sdk-js-hw-provider.sh
package.json		package.json
tsconfig.cjs.json		tsconfig.cjs.json
tsconfig.json		tsconfig.json
tsconfig.test.json		tsconfig.test.json
yarn.lock		yarn.lock

multiversx/mx-sdk-dapp

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sdk-dapp

Installation

If you're transitioning from dapp-core 1.x to @multiversx/sdk-dapp (dapp-core 2.0), please read the Migration guide

As of @multiversx/sdk-dapp@2.28.0 Node >=18 is required since Node 16 reached its EOL.

Usage

Prerequisites

React

DappProvider

UI Wrappers

User Identity

Login UI

Login hooks

Reading User State

Transactions

Sending Transactions

Sending transactions synchronously in batches

How to synchronize transactions ?

Transaction Signing Flow

Tracking a transaction

1. Built-in tracking

2. Tracking transaction status

Tracking transactions' statuses

Transaction Toasts UI

Removing transactions manually

Unit testing with Jest

sdk-dapp exports

constants exports

hooks exports

Login

Account

Transactions

Misc

services exports

utils exports

Account

Operations

Transactions

Validation

Misc

Wrappers

Web-specific imports

UI

React Native support

Next.js support

WalletConnect 2.0 Setup

Set the walletConnectV2ProjectId

Experimental features

ExperimentalWebviewProvider

Usage

Implementation

Development Status

Integration Guide

Example Integration

Roadmap

Contributing

License

About

Resources

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Contributors 27

Languages

Set the `walletConnectV2ProjectId`

Packages