Metamask: How to deploy smart contract using truffle and ropsten with Metamask account

Deploying Smart Contracts with Metamask and Truffle

In this article, we will walk you through the process of deploying smart contracts using Metamask and Truffle on the Ropsten testnet. We will also address an issue you may encounter when trying to migrate your contract.

Prerequisites

• Node.js (LTS or latest)

• Truffle CLI (npm install -g truffle)

• Metamask wallet

Step 1: Create a new project and configure your settings

Create a new directory for your project and initialize it with truffle init. Add the following configuration to your metamask.js file:

const Metamask = require('metamask');
module.exports = {
// Your account name (e.g. "your_account")
mnemonic: "YourMnemonic",
// The network you want to use
network: {
ropsten,
},
// Your Metamask wallet password (this will be used as the contract key)
password: "",
};

Step 2: Create a new smart contract

Create a new file called contract.js and add the following code:

const Web3 = require('web3');
const Web3Contract = require('web3-ethereum-contracts');
class MySmartContract {
constructor() {
this.web3 = new Web3(new Web3.providers.HttpProvider('
constContractAddress = '0xYourContractAddress';
const contractabi = {"version": "1", "name": "MyContract", "functions": ["myFunction"]};
this.contracts = new Web3Contract(this.web3, contractAddress, contractabi);
}
myFunction() {
// Call the function you want to implement
console.log("Greetings from my function!");
}
}
module.exports = MySmartContract;

Step 3: Compile and implement your smart contract

Create a new file called compile.js and add the following code:

const Truffle = require('tartuf');
module.exports = {
compile() {
return new Trufflesolid();
},
};

Step 4: Use Truffle to migrate your contract from Ropsten

Run the following command in your terminal:

npm run compile

truffle migrate --network ropsten

Step 5: Update your Metamask account

Update your metamask.js file with the following configuration:

const Metamask = require('metamask');
const ropstenAddress = "0xYourRopstenAccount";
const ropstenPassword = "";
module.exports = {
mnemonic: ropstenPassword,
network: {
ropsten: {
address: ropstenAddress,
password: ropstenPassword,
},
},
};

Step 6: Deploy your contract using Metamask

Update your metamask.js file with the following configuration:

const Metamask = require('metamask');

const ropstenAddress = "0xYourRopstenAccount";

const ropstenPassword = "";


module.exports = {

  mnemonic: ropstenPassword,

  network: {

    ropsten: {

      address: ropstenAddress,

      password: ropstenPassword,

    },

  },

};

Error Message

When you run truffle migrate --network ropsten, you should get an error similar to this:

npm run compile

This is because the compiled version of your contract does not include any metadata that Truffle requires for implementation.

Solution

To fix this issue, you need to update your compiled contract to include the required metadata. You can do this by adding the following code to your compile.js file:

“`javascript

const Web3Contract = require(‘web3-ethereum-contracts’);

class MySmartContract {

constructor() {

const web3 = new Web3(new Web3.providers.HttpProvider(‘

this.