Connect to a parity node

connect_unlockAccount.js

/*
* connect to ethereum node
*/ 
const ethereumUri = 'http://localhost:8540';
const address = '0x004ec07d2329997267Ec62b4166639513386F32E'; // user

let web3 = new Web3();
web3.setProvider(new web3.providers.HttpProvider(ethereumUri));

if(!web3.isConnected()){
    throw new Error('unable to connect to ethereum node at ' + ethereumUri);
}else{
    console.log('connected to ehterum node at ' + ethereumUri);
    let coinbase = web3.eth.coinbase;
    console.log('coinbase:' + coinbase);
    let balance = web3.eth.getBalance(coinbase);
    console.log('balance:' + web3.fromWei(balance, 'ether') + " ETH");
    let accounts = web3.eth.accounts;
    console.log(accounts);
    
    if (web3.personal.unlockAccount(address, 'user')) {
        console.log(`${address} is unlocaked`);
    }else{
        console.log(`unlock failed, ${address}`);
    }
}