JavaScript Quickstart

mkdir hedera-quickstart && cd hedera-quickstart
npm init -y
npm install --save @hiero-ledger/sdk
npm install dotenv

{
  "type": "module"
}

OPERATOR_ID=0.0.1234
OPERATOR_KEY=3030020100300706052b8104000a04220420a1b2c...

import {
    Client,
    AccountId,
    PrivateKey,
    Hbar,
    MirrorNodeAccountBalanceQuery,
    TransferTransaction,
} from "@hiero-ledger/sdk";
import "dotenv/config";

async function main() {
    const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
    const operatorKey = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);

    // Connect to testnet using the operator account as the default payer.
    const client = Client.forTestnet().setOperator(operatorId, operatorKey);

    // 1. Query the operator's balance (free mirror node read).
    // MirrorNodeAccountBalanceQuery replaces the deprecated AccountBalanceQuery.
    const balance = await new MirrorNodeAccountBalanceQuery()
        .setAccountId(operatorId)
        .execute(client);
    console.log("Operator balance:", balance.hbars.toString());

    // 2. Transfer 1 HBAR to account 0.0.3 (a test recipient).
    const response = await new TransferTransaction()
        .addHbarTransfer(operatorId, new Hbar(-1))
        .addHbarTransfer("0.0.3", new Hbar(1))
        .execute(client);

    const receipt = await response.getReceipt(client);
    console.log("Transfer status:", receipt.status.toString());
    console.log("Transaction ID:", response.transactionId.toString());

    client.close();
}

main().catch((err) => {
    console.error(err);
    process.exit(1);
});

node index.js

Operator balance: 10000 ℏ
Transfer status: SUCCESS
Transaction ID: 0.0.1234@1700000000.123456789

https://hashscan.io/testnet/transaction/<transactionId>