testweb3.js

const Web3 = require('web3');

// Create a new instance of Web3
const web3 = new Web3('YOUR_PROVIDER_URL');

// Set the private key for your wallet
const privateKey = 'YOUR_PRIVATE_KEY';

// Create an account from the private key
const account = web3.eth.accounts.privateKeyToAccount(privateKey);

// Unlock the account if necessary
web3.eth.personal.unlockAccount(account.address, 'YOUR_ACCOUNT_PASSWORD', 600)
  .then(() => {
    // ABI (Application Binary Interface) of the contract
    const contractABI = [
      // Your ABI definition here
    ];

    // Address of the contract
    const contractAddress = 'YOUR_CONTRACT_ADDRESS';

    // Create an instance of the contract
    const contract = new web3.eth.Contract(contractABI, contractAddress);

    // Customize your contract function call here
    const functionName = 'YOUR_FUNCTION_NAME';
    const functionArguments = ['ARGUMENT_1', 'ARGUMENT_2'];

    // Create the transaction object
    const txObject = contract.methods[functionName](...functionArguments);

    // Estimate the gas required for the transaction
    txObject.estimateGas({ from: account.address })
      .then((gas) => {
        // Set the gas limit for the transaction
        const gasLimit = gas + 10000;

        // Build the transaction object
        const tx = {
          from: account.address,
          to: contractAddress,
          gas: gasLimit,
          data: txObject.encodeABI(),
        };

        // Sign the transaction with the account's private key
        return account.signTransaction(tx);
      })
      .then((signedTx) => {
        // Send the signed transaction
        return web3.eth.sendSignedTransaction(signedTx.rawTransaction);
      })
      .then((receipt) => {
        console.log('Transaction successful!');
        console.log('Receipt:', receipt);
      })
      .catch((error) => {
        console.error('Error occurred:', error);
      });
  })
  .catch((error) => {
    console.error('Error occurred:', error);
  });