Dapps (Browser)

Quick Start For Dapps with Examples
Quick Start For Dapps (Client SDK - browser)
You can use the Test Wallet to test your integration at test.walletconnect.org (Source code). Keep in mind that this is not a secure wallet - Do not store funds.
Install
yarn
npm
yarn add @walletconnect/browser @walletconnect/qrcode-modal
npm install --save @walletconnect/browser @walletconnect/qrcode-modal
Syntax shown below is Javascript ES6 which requires bundling and transpiling to run in web browsers. If unfamiliar we recommend setting up an environment using Webpack Starter or Create React App​
Initiate Connection
import WalletConnect from "@walletconnect/browser";
import WalletConnectQRCodeModal from "@walletconnect/qrcode-modal";
​
// Create a walletConnector
const walletConnector = new WalletConnect({
  bridge: "https://bridge.walletconnect.org" // Required
});
​
// Check if connection is already established
if (!walletConnector.connected) {
  // create new session
  walletConnector.createSession().then(() => {
    // get uri for QR Code modal
    const uri = walletConnector.uri;
    // display QR Code modal
    WalletConnectQRCodeModal.open(uri, () => {
      console.log("QR Code Modal closed");
    });
  });
}
​
// Subscribe to connection events
walletConnector.on("connect", (error, payload) => {
  if (error) {
    throw error;
  }
​
  // Close QR Code Modal
  WalletConnectQRCodeModal.close();
​
  // Get provided accounts and chainId
  const { accounts, chainId } = payload.params[0];
});
​
walletConnector.on("session_update", (error, payload) => {
  if (error) {
    throw error;
  }
​
  // Get updated accounts and chainId
  const { accounts, chainId } = payload.params[0];
});
​
walletConnector.on("disconnect", (error, payload) => {
  if (error) {
    throw error;
  }
​
  // Delete walletConnector
});
Send Transaction (eth_sendTransaction)
// Draft transaction
const tx = {
  from: "0xbc28Ea04101F03aA7a94C1379bc3AB32E65e62d3", // Required
  to: "0x89D24A7b4cCB1b6fAA2625Fe562bDd9A23260359", // Required (for non contract deployments)
  data: "0x", // Required
  gasPrice: "0x02540be400", // Optional
  gasLimit: "0x9c40", // Optional
  value: "0x00", // Optional
  nonce: "0x0114" // Optional
};
​
// Send transaction
walletConnector
  .sendTransaction(tx)
  .then(result => {
    // Returns transaction id (hash)
    console.log(result);
  })
  .catch(error => {
    // Error returned when rejected
    console.error(error);
  });
Sign Transaction (eth_signTransaction)
// Draft transaction
const tx = {
  from: "0xbc28Ea04101F03aA7a94C1379bc3AB32E65e62d3", // Required
  to: "0x89D24A7b4cCB1b6fAA2625Fe562bDd9A23260359", // Required (for non contract deployments)
  data: "0x", // Required
  gasPrice: "0x02540be400", // Optional
  gasLimit: "0x9c40", // Optional
  value: "0x00", // Optional
  nonce: "0x0114" // Optional
};
​
// Sign transaction
walletConnector
  .signTransaction(tx)
  .then(result => {
    // Returns signed transaction
    console.log(result);
  })
  .catch(error => {
    // Error returned when rejected
    console.error(error);
  });
Sign Personal Message (personal_sign)
// Draft Message Parameters
const message = "My email is john@doe.com - 1537836206101"
​
const msgParams = [
  convertUtf8ToHex(message)                                                 // Required
  "0xbc28ea04101f03ea7a94c1379bc3ab32e65e62d3",                             // Required
];
​
​
// Sign personal message
walletConnector
  .signPersonalMessage(msgParams)
  .then((result) => {
    // Returns signature.
    console.log(result)
  })
  .catch(error => {
    // Error returned when rejected
    console.error(error);
  })
Sign Message (eth_sign)
// Draft Message Parameters
const message = "My email is john@doe.com - 1537836206101";
​
const msgParams = [
  "0xbc28ea04101f03ea7a94c1379bc3ab32e65e62d3",                            // Required
  keccak256("\x19Ethereum Signed Message:\n" + len(message) + message))    // Required
];
​
​
// Sign message
walletConnector
  .signMessage(msgParams)
  .then((result) => {
    // Returns signature.
    console.log(result)
  })
  .catch(error => {
    // Error returned when rejected
    console.error(error);
  })
Sign Typed Data (eth_signTypedData)
// Draft Message Parameters
const typedData = {
  types: {
    EIP712Domain: [
      { name: "name", type: "string" },
      { name: "version", type: "string" },
      { name: "chainId", type: "uint256" },
      { name: "verifyingContract", type: "address" }
    ],
    Person: [
      { name: "name", type: "string" },
      { name: "account", type: "address" }
    ],
    Mail: [
      { name: "from", type: "Person" },
      { name: "to", type: "Person" },
      { name: "contents", type: "string" }
    ]
  },
  primaryType: "Mail",
  domain: {
    name: "Example Dapp",
    version: "1.0.0-beta",
    chainId: 1,
    verifyingContract: "0x0000000000000000000000000000000000000000"
  },
  message: {
    from: {
      name: "Alice",
      account: "0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
    },
    to: {
      name: "Bob",
      account: "0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
    },
    contents: "Hey, Bob!"
  }
};
​
const msgParams = [
  "0xbc28ea04101f03ea7a94c1379bc3ab32e65e62d3", // Required
  typedData // Required
];
​
// Sign Typed Data
walletConnector
  .signTypedData(msgParams)
  .then(result => {
    // Returns signature.
    console.log(result);
  })
  .catch(error => {
    // Error returned when rejected
    console.error(error);
  });
Send Custom Request
// Draft Custom Request
const customRequest = {
  id: 1337,
  jsonrpc: "2.0",
  method: "eth_signTransaction",
  params: [
    {
      from: "0xbc28Ea04101F03aA7a94C1379bc3AB32E65e62d3",
      to: "0x89D24A7b4cCB1b6fAA2625Fe562bDd9A23260359",
      data: "0x",
      gasPrice: "0x02540be400",
      gasLimit: "0x9c40",
      value: "0x00",
      nonce: "0x0114"
    }
  ]
};
​
// Send Custom Request
walletConnector
  .sendCustomRequest(customRequest)
  .then(result => {
    // Returns request result
    console.log(result);
  })
  .catch(error => {
    // Error returned when rejected
    console.error(error);
  });
Quick Start (Examples)
Wallets
Last updated Sat Jul 13 2019 16:48:02 GMT+0000 (UTC)