[Ethereum] Cant get address balance using web3js

balancesweb3js

I am trying to write a function to get the ethereum balance of a wallet address via web3js. Problem is I am unable to make it work for some reason. Here is my code running in VSCode:

const testnet = 'https://ropsten.etherscan.io/';
const walletAddress = '0x8690F1feff62008A396B31c2C3f380bD0Ca6d8b8';

const web3 = new Web3(new Web3.providers.HttpProvider(testnet));
var balance = web3.eth.getBalance(walletAddress);

The wallet contains 0.98 ether on ropsten but for some reason its not returning when I call it from my code. What am I doing wrong?

Best Answer

The issue with your testnet url, https://ropsten.etherscan.io/ is not running eth client.

Find below code to connect ropsten node.

const testnet = 'https://ropsten.infura.io/';
const walletAddress = '0x8690F1feff62008A396B31c2C3f380bD0Ca6d8b8';

const web3 = new Web3(new Web3.providers.HttpProvider(testnet));
var balance = web3.eth.getBalance(walletAddress); //Will give value in.
balance = web3.toDecimal(balance);

I am getting value. Now balance will give as wei. Check web3 api method's for the same.

https://github.com/ethereum/wiki/wiki/JavaScript-API#web3towei

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I'm using web3.js version: 0.20.1 in node.js express application. I'm running Parity in Virtualbox Ubuntu machine.

The correct code looks like following:

var count = web3.eth.getTransactionCount("0x26...");
var abiArray = JSON.parse(fs.readFileSync('mycoin.json', 'utf-8'));
var contractAddress = "0x8...";
var contract = web3.eth.contract(abiArray).at(contractAddress);
var rawTransaction = {
    "from": "0x26...",
    "nonce": web3.toHex(count),
    "gasPrice": "0x04e3b29200",
    "gasLimit": "0x7458",
    "to": contractAddress,
    "value": "0x0",
    "data": contract.transfer.getData("0xCb...", 10, {from: "0x26..."}),
    "chainId": 0x03
};

var privKey = new Buffer('fc3...', 'hex');
var tx = new Tx(rawTransaction);

tx.sign(privKey);
var serializedTx = tx.serialize();

web3.eth.sendRawTransaction('0x' + serializedTx.toString('hex'), function(err, hash) {
    if (!err)
        console.log(hash);
    else
        console.log(err);
});

[Ethereum] JSON RPC get address balance

If you’re querying for historical balances, you have to be running an archive node otherwise all the balances will report as zero.

If you’re not running an archive note, you can query any address as far back as 250 blocks (or some small number) from the head.

Best Answer

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