Pera Connect

JavaScript SDK for integrating Pera Wallet to web applications.

What is @perawallet/connect?

@perawallet/connect is a JavaScript SDK for integrating Pera Wallet to web applications. You can use this SDK to connect to a dApp, sign transactions, etc. using Pera Wallet.

@perawallet/connect is maintained by the Pera Team. For more detailed information you can read this document or the GitHub readme.

Check the Migrating to @perawallet/connect@1.0.0 guide before migrating to V1 or higher.

Quick Start

Let's look at how we can connect Pera Wallet to our dApp using **@perawallet/connect**. We will use React for these examples, but you can also use **@perawallet/connect** with other frameworks. For this, you can take a look at the example applications section. Let’s start!

  1. First, install @perawallet/connect

npm install --save @perawallet/connect
-- or --
yarn add @perawallet/connect

After that you can import the SDK into your React app like this using:

 import {PeraWalletConnect} from "@perawallet/connect"

2. Create the PeraWalletConnect instance:

const peraWallet = new PeraWalletConnect();

When creating a new instance, you can use different options:

interface PeraWalletConnectOptions {
  shouldShowSignTxnToast?: boolean;
  chainId?: AlgorandChainIDs;
}

  • chainId

    Determines which Algorand network your dApp uses.

    MainNet: 416001

    TestNet: 416002

    BetaNet: 416003

    All Networks: 4160

    type AlgorandChainIDs = 416001 | 416002 | 416003 | 4160;

const peraWallet = new PeraWalletConnect({
    // Default chainId is "4160"
    chainId: "416001"
});

  • shouldShowSignTxnToast

It's enabled by default but in some cases, you may not need the toast message (e.g. you already have signing guidance for users). To disable it, use the shouldShowSignTxnToast option:

const peraWallet = new PeraWalletConnect({
    shouldShowSignTxnToast: false
});

3. Create connect example button for wallet connection:

function App() {
  // Store account address which is connected dApp with Pera Wallet
  const [accountAddress, setAccountAddress] = (useState < string) | (null > null);
  // Check app is connected with Pera Wallet
  const isConnectedToPeraWallet = !!accountAddress;

  return (
    <button
      onClick={
        isConnectedToPeraWallet ? handleDisconnectWalletClick : handleConnectWalletClick
      }>
      {isConnectedToPeraWallet ? "Disconnect" : "Connect to Pera Wallet"}
    </button>
  );
}

4. Create handler methods for Pera Wallet connection:

handleWalletConnectClick()

function handleConnectWalletClick() {
    peraWallet
      .connect()
      .then((newAccounts) => {
        // Setup the disconnect event listener
        peraWallet.connector?.on("disconnect", handleDisconnectWalletClick);

        setAccountAddress(newAccounts[0]);
      })
      .reject((error) => {
        // You MUST handle the reject because once the user closes the modal, peraWallet.connect() promise will be rejected.
        // For the async/await syntax you MUST use try/catch
        if (error?.data?.type !== "CONNECT_MODAL_CLOSED") {
          // log the necessary errors
        }
      });
  }

handleDisconnectWalletClick()

function handleDisconnectWalletClick() {
   peraWallet.disconnect();
   setAccountAddress(null);
}

We use them in the onClick event of the button that we created in the previous step. If there is an account connected to the dApp, we use the handleDisconnectWalletClick() function, if there is no account connected, we use the handleWalletConnectClick() function.

5. If you don't want the user's account information to be lost by the dApp when the user closes the browser with with the wallet connection to the dApp, you need to handle the reconnect session status. You can do this in the following way:

useEffect(() => {
    // Reconnect to the session when the component is mounted
    peraWallet.reconnectSession().then((accounts) => {
      // Setup the disconnect event listener
      peraWallet.connector?.on("disconnect", handleDisconnectWalletClick);

      if (peraWallet.isConnected && accounts.length) {
        setAccountAddress(accounts[0]);
      }
    }).catch(error) {
				console.log(error);
			};
  }, []);

After these 5 steps, you can use your dApp making new transactions with Pera Wallet 🎊. Your App.tsx file will look like this.

import {PeraWalletConnect} from "@perawallet/connect";

// Create the PeraWalletConnect instance outside of the component
const peraWallet = new PeraWalletConnect();

function App() {
  const [accountAddress, setAccountAddress] = (useState < string) | (null > null);
  const isConnectedToPeraWallet = !!accountAddress;

  useEffect(() => {
    // Reconnect to the session when the component is mounted
    peraWallet.reconnectSession().then((accounts) => {
      // Setup the disconnect event listener
      peraWallet.connector?.on("disconnect", handleDisconnectWalletClick);

      if (accounts.length) {
        setAccountAddress(accounts[0]);
      }
    });
  }, []);

  return (
    <button
      onClick={
        isConnectedToPeraWallet ? handleDisconnectWalletClick : handleConnectWalletClick
      }>
      {isConnectedToPeraWallet ? "Disconnect" : "Connect to Pera Wallet"}
    </button>
  );

  function handleConnectWalletClick() {
    peraWallet
      .connect()
      .then((newAccounts) => {
        // Setup the disconnect event listener
        peraWallet.connector?.on("disconnect", handleDisconnectWalletClick);

        setAccountAddress(newAccounts[0]);
      })
      .reject((error) => {
        // You MUST handle the reject because once the user closes the modal, peraWallet.connect() promise will be rejected.
        // For the async/await syntax you MUST use try/catch
        if (error?.data?.type !== "CONNECT_MODAL_CLOSED") {
          // log the necessary errors
        }
      });
  }

  function handleDisconnectWalletClick() {
    peraWallet.disconnect();

    setAccountAddress(null);
  }
}

Using with React@18

When you want to use @perawallet/connect library with React 18, you need to make some changes. react-scripts stopped polyfilling some of the packages with the react-scripts@5.x version. After creating a new app with npx create-react-app my-app or in your react application, the following changes should be made.

  1. Firstly, install the following packages

npm install buffer
npm install crypto-browserify
npm install process
npm install react-app-rewired
npm install stream-browserify

2. After that you need to override some webpack features. Create the following file in the root directory of the project and copy the following code block into it.

config-overrides.js

// eslint-disable-next-line @typescript-eslint/no-var-requires
const webpack = require('webpack');

module.exports = function override(config) {
  const fallback = config.resolve.fallback || {};

  Object.assign(fallback, {
    crypto: require.resolve('crypto-browserify'),
    stream: require.resolve('stream-browserify'),
  });
  config.resolve.fallback = fallback;
  // ignore warning about source map of perawallet/connect

  config.ignoreWarnings = [/Failed to parse source map/];
  config.plugins = (config.plugins || []).concat([
    new webpack.ProvidePlugin({
      process: 'process/browser',
      Buffer: ['buffer', 'Buffer'],
    }),
  ]);
  return config;
};

3. You need to update react-scripts version to 5.0.1 or higher.

{
    "react-scripts": "5.0.1",
}

4. Finally, you need to update the npm scripts.

{
    "start": "react-app-rewired start",
    "build": "react-app-rewired build"
}

After that, you are good to go! 🎊

Methods

PeraWalletConnect.connect(): Promise<string[]>

  • Starts the initial connection flow and returns the array of account addresses.

PeraWalletConnect.reconnectSession(): Promise<string[]>

  • Reconnects to the wallet if there is any active connection and returns the array of account addresses.

PeraWalletConnect.disconnect(): Promise<void | undefined>

  • Disconnects from the wallet and resets the related storage items.

PeraWalletConnect.platform: PeraWalletPlatformType

  • Returns the platform of the active session. Possible responses: mobile | web | null

PeraWalletConnect.isConnected: boolean

  • Checks if there's any active session regardless of platform. Possible responses: true | false

PeraWalletConnect.signTransaction(txGroups: SignerTransaction[][], signerAddress?: string): Promise<Uint8Array[]>

  • Starts the sign process and returns the signed transaction in Uint8Array

Signing Transactions

@perawallet/connect also allows signing transactions using the Pera Wallet application. Once the signTransaction method is triggered, if the user is on a mobile browser, the Pera Wallet app will be launched automatically. If the browser blocks the redirection there's also a popup that links to the Pera Wallet app. There's an option called shouldShowSignTxnToast to disable it, see the example below:

const peraWallet = new PeraWalletConnect({shouldShowSignTxnToast: false});

You can also call the closePeraWalletSignTxnToast function to hide the toast.

import {closePeraWalletSignTxnToast} from "@perawallet/connect";

// ...Business logic

// Close the toast message
closePeraWalletSignTxnToast();

signTransaction accepts SignerTransaction[][] the type can be find below:

import {Transaction} from "algosdk";

export interface SignerTransaction {
  txn: Transaction;
  /**
   * Optional list of addresses that must sign the transactions.
   * Wallet skips to sign this txn if signers is empty array.
   * If undefined, wallet tries to sign it.
   */
  signers?: string[];
}

You have to follow these steps to a sign transaction.

  1. Set up algosdk client

const algod = new algosdk.Algodv2("", CLIENT_SERVER_URL, CLIENT_SERVER_PORT);

2. Set up Transactions

const suggestedParams = await algod.getTransactionParams().do();
const optInTxn = algosdk.makeAssetTransferTxnWithSuggestedParamsFromObject({
  from: FROM_ADDRESS,
  to: FROM_ADDRESS,
  assetIndex: ASSET_ID,
  amount: 0,
  suggestedParams
});
const optInTxn2 = algosdk.makeAssetTransferTxnWithSuggestedParamsFromObject({
  from: FROM_ADDRESS,
  to: FROM_ADDRESS,
  assetIndex: ASSET_ID,
  amount: 0,
  suggestedParams
});

3. Map Transaction to SignerTransaction[]

const singleTxnGroups = [{txn: optInTxn, signers: [FROM_ADDRESS]}];
const multipleTxnGroups = [
  {txn: optInTxn, signers: [FROM_ADDRESS]},
  {txn: optInTxn2, signers: [FROM_ADDRESS]}
];

4. (Optional step) Create some utility functions to create the transaction before the sign transaction function

generateOptIntoAssetTxns({assetID, initiatorAddr})

async function generateOptIntoAssetTxns({
  assetID,
  initiatorAddr
}: {
  assetID: number;
  initiatorAddr: string;
}): Promise<SignerTransaction[]> {
  const suggestedParams = await algod.getTransactionParams().do();
  const optInTxn = algosdk.makeAssetTransferTxnWithSuggestedParamsFromObject({
    from: initiatorAddr,
    to: initiatorAddr,
    assetIndex: assetID,
    amount: 0,
    suggestedParams
  });

  return [{txn: optInTxn, signers: [initiatorAddr]}];
}

generatePaymentTxns({to, initiatorAddr})

async function generatePaymentTxns({
  to,
  initiatorAddr
}: {
  to: string;
  initiatorAddr: string;
}) {
  const suggestedParams = await algod.getTransactionParams().do();

  const txn = algosdk.makePaymentTxnWithSuggestedParamsFromObject({
    from: initiatorAddr,
    to,
    amount: 1,
    suggestedParams
  });

  return [{txn, signers: [initiatorAddr]}];
}

generateAssetTransferTxns({to, assetID, initiatorAddr})

async function generateAssetTransferTxns({
  to,
  assetID,
  initiatorAddr
}: {
  to: string;
  assetID: number;
  initiatorAddr: string;
}) {
  const suggestedParams = await algod.getTransactionParams().do();

  const txn = algosdk.makeAssetTransferTxnWithSuggestedParamsFromObject({
    from: initiatorAddr,
    to,
    assetIndex: assetID,
    amount: 1,
    suggestedParams
  });

  return [{txn, signers: [initiatorAddr]}];
}

5. After this, you can sign a single transaction or group transaction using promises

Single Transaction

try {
  const signedTxn = await peraWallet.signTransaction([singleTxnGroups]);
} catch (error) {
  console.log("Couldn't sign Opt-in txns", error);
}

Group Transaction

try {
  const signedTxns = await peraWallet.signTransaction([multipleTxnGroups]);
} catch (error) {
  console.log("Couldn't sign Opt-in txns", error);
}

Payment Transactions

const txGroups = await generatePaymentTxns({
	to: "GD64YIY3TWGDMCNPP553DZPPR6LDUSFQOIJVFDPPXWEG3FVOJCCDBBHU5A",
  initiatorAddr: accountAddress!
});

try {
  const signedTxnGroup = await peraWallet.signTransaction([txGroups]);
  const {txId} = await algod.sendRawTransaction(signedTxnGroup).do();
} catch (error) {
  console.log("Couldn't sign payment txns",error);
}

Asset Transfer Transactions

const txGroups = await generateAssetTransferTxns({
  to: "GD64YIY3TWGDMCNPP553DZPPR6LDUSFQOIJVFDPPXWEG3FVOJCCDBBHU5A",
  assetID: 10458941,
  initiatorAddr: accountAddress!
});

try {
  const signedTxnGroup = await peraWallet.signTransaction([txGroups]);
  console.log(signedTxnGroup);
  
  const {txId} = await algod.sendRawTransaction(signedTxnGroup).do();
} catch (error) {
  console.log("Couldn't sign asset transfer txns",error);
}

Opt-In Asset Transactions

const txGroups = await generateOptIntoAssetTxns({
  assetID: 10458941,
  initiatorAddr: accountAddress!
});

try {
  await peraWallet.signTransaction([txGroups]);
} catch (error) {
  console.log("Couldn't sign Opt-in txns",error);
}

Multiple Transactions

const optinTxGroups = await generateOptIntoAssetTxns({
  assetID: 10458941,
  initiatorAddr: accountAddress!
});
const transferTxGroups = await generateAssetTransferTxns({
  to: "GD64YIY3TWGDMCNPP553DZPPR6LDUSFQOIJVFDPPXWEG3FVOJCCDBBHU5A",
  assetID: 10458941,
  initiatorAddr: accountAddress!
 });

try {
  const signedTxnGroups = await peraWallet.signTransaction([
    optinTxGroups,
    transferTxGroups
  ]);

  console.log(signedTxnGroups);

  // Sign every txn in the group
  for (const signedTxnGroup of signedTxnGroups) {
    const {txId} = await algod.sendRawTransaction(signedTxnGroup).do();

    console.log(`txns signed successfully! - txID: ${txId}`);
  }
} catch (error) {
  console.log("Couldn't sign all txns",error);
}

Customization

@perawallet/connect lets you UI change a few things based on your dApp's needs.

  1. Change Pera Wallet Connect Modal z-index to avoid conflicts

.pera-wallet-modal {
    // The default value of z-index is 10. You can lower and raise it as much as you want.
    z-index: 11;
}

2. Remove Sign Guidance Toast

const peraWallet = new PeraWalletConnect({
    shouldShowSignTxnToast: false
});

3. Close Sign Guidance Toast

import {closePeraWalletSignTxnToast} from "@perawallet/connect";

// ...Business logic

// Close the toast message
closePeraWalletSignTxnToast();

4. Your app name on Pera Wallet

By default, the connect wallet drawer on Pera Wallet gets the app name from document.title

In some cases, you may want to customize it. You can achieve this by adding a meta tag to your HTML between the head tag.

<meta name="name" content="My dApp" />

Example Applications

Brand Guidelines

Please follow our brand guidelines when using @perawallet/connect in your dApp. To download our Media Kit that includes useful assets such as the official Pera logo, App images, roadmap, and official links, please visit our website.

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