Can I use Truffle framework?

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Truffle is a good framework for deploying and managing your smart contracts, typically on the Ethereum network. In Klaytn you can use Truffle framework as well.

case 1. Running a local node

If you are running your own local EN(endpoint node), you can configure Truffle as below and use it right away.

// truffle-config.js
module.exports = {
    networks: {
        klaytn: {
            host: '127.0.0.1',
            port: 8551,
            from: '0x75a59b94889a05c03c66c3c84e9d2f8308ca4abd', // enter your account address
            network_id: '1001', // Baobab network id
            gas: 20000000, // transaction gas limit
            gasPrice: 25000000000, // gasPrice of Baobab is 25 Gpeb
        },
    },
    compilers: {
      solc: {
        version: "0.5.6"    // Specify compiler's version to 0.5.6
      }
  }
};

case 2. Using a public node

Install truffle-hdwallet-provider-klaytn

If are using a public or remote node, you need to install truffle-hdwallet-provider-klaytn (link). You can install via npm as the following.

$ npm install truffle-hdwallet-provider-klaytn

Configure Truffle

Depending on if you want to use a mnemonic or a plain private key, configure Truffle as one of the following.

Using a mnemonic

const HDWalletProvider = require("truffle-hdwallet-provider-klaytn");

const mnemonic = "mountains supernatural bird ...";

module.exports = {
  networks: {
    development: {
      host: "localhost",
      port: 8545,
      network_id: "*" // Match any network id
    },
    testnet: {
      provider: () => new HDWalletProvider(mnemonic, "https://api.baobab.klaytn.net:8651"),
      network_id: '1001', //Klaytn baobab testnet's network id
      gas: '8500000',
      gasPrice: null
    },
    mainnet: {
      provider: () => new HDWalletProvider(mnemonic, "https://api.cypress.klaytn.net:8651"),
      network_id: '8217', //Klaytn mainnet's network id
      gas: '8500000',
      gasPrice: null
    }
  }
};

Using a private key

const HDWalletProvider = require("truffle-hdwallet-provider-klaytn");

const privateKey = "0x123 ...";

module.exports = {
  networks: {
    development: {
      host: "localhost",
      port: 8545,
      network_id: "*" // Match any network id
    },
    testnet: {
      provider: () => new HDWalletProvider(privateKey, "https://api.baobab.klaytn.net:8651"),
      network_id: '1001', //Klaytn baobab testnet's network id
      gas: '8500000',
      gasPrice: null
    },
    mainnet: {
      provider: () => new HDWalletProvider(privateKey, "https://api.cypress.klaytn.net:8651"),
      network_id: '8217', //Klaytn mainnet's network id
      gas: '8500000',
      gasPrice: null
    }
  }
};

Warning: In the above examples, keys are hardcoded in your configuration file. In production, you do not want to do this for the sake of security. Make sure you find a way to keep your keys safe.

Deploy contracts

Deploying on Klaytn testnet

$ truffle deploy --network testnet

Deploying on Klaytn mainnet

$ truffle deploy --network mainnet
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