[Ethereum] How to connect ethers.js with MetaMAsk and other Wallets

etherethereum-wallet-dappethers.jsmetamasknodejs

const provider = new ethers.providers.Web3Provider(window.ethereum)

while using this i am getting window is not defined error..and i dont know how to use it. Do anyone has idea how to do it

Best Answer

In my case I used web3. It works fine for me. Try for ethers...

if (typeof window !== 'undefined' && typeof window.web3 !== 'undefined') {
  // We are in the browser and metamask is running.
  web3 = new Web3(window.web3.currentProvider);
} else {
  // We are on the server OR the user is not running metamask
 const provider = new Web3.providers.HttpProvider(
 "https://rinkeby.infura.io/v3/MY_API_KEY"
);
web3 = new Web3(provider);
}

Related Solutions

[Ethereum] Deploy smart contract to mainnet with Infura and MetaMask

Go here and generate a 12 word mnemonic, for "Coin" select ETH.
Save the mnemonic (the 12 words), and, lower down the page, the first address (derivation path ending with 0) and private key somewhere safe.
Transfer some ETH from your account to the one that corresponds to the mnemonic you just generated. You can import it into MetaMask with the private key and later return the unused ETH.
Use this tutorial to deploy your smart contracts through truffle, of course don't forget to replace the mnemonic from the tutorial with the one you just generated.
Adjust the Provider URL in the tutorial with your personal access URL you received in the mail from infura, also, in the network configuration of the code example of the tutorial, change "ropsten" to "mainnet".

then do truffle migrate --mainnet --dry-run (only available in v4beta, but a good habit) to check, if everything is fine, and then truffle migrate --mainnet.

EDIT: Of course you're also free to use the mnemonic from MetaMask.

[Ethereum] How to automatically add a custom token to MetaMask with ethers.js

The API for doing this is defined in EIP-747.

You'll need to use the wallet_watchAsset method, something along the lines of the following example code:

const tokenAddress = '0xd00981105e61274c8a5cd5a88fe7e037d935b513';
const tokenSymbol = 'TUT';
const tokenDecimals = 18;
const tokenImage = 'http://placekitten.com/200/300';

try {
  // wasAdded is a boolean. Like any RPC method, an error may be thrown.
  const wasAdded = await ethereum.request({
    method: 'wallet_watchAsset',
    params: {
      type: 'ERC20', // Initially only supports ERC20, but eventually more!
      options: {
        address: tokenAddress, // The address that the token is at.
        symbol: tokenSymbol, // A ticker symbol or shorthand, up to 5 chars.
        decimals: tokenDecimals, // The number of decimals in the token
        image: tokenImage, // A string url of the token logo
      },
    },
  });

  if (wasAdded) {
    console.log('Thanks for your interest!');
  } else {
    console.log('Your loss!');
  }
} catch (error) {
  console.log(error);
}

Best Answer

Related Solutions

[Ethereum] Deploy smart contract to mainnet with Infura and MetaMask

[Ethereum] How to automatically add a custom token to MetaMask with ethers.js

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