getTokenAccountBalanceの使用方法

# Basic Request (replace <TOKEN_ACCOUNT_PUBKEY>):
curl -X POST -H "Content-Type: application/json" -d \
  '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getTokenAccountBalance",
    "params": [
      "<TOKEN_ACCOUNT_PUBKEY>"
    ]
  }' \
  <YOUR_RPC_URL>

# Request with commitment (replace <TOKEN_ACCOUNT_PUBKEY>):
curl -X POST -H "Content-Type: application/json" -d \
  '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getTokenAccountBalance",
    "params": [
      "<TOKEN_ACCOUNT_PUBKEY>",
      {
        "commitment": "confirmed"
      }
    ]
  }' \
  <YOUR_RPC_URL>

const { Connection, PublicKey } = require('@solana/web3.js');

async function checkTokenBalance(tokenAccountPublicKey) {
  // Replace with your RPC endpoint
  const connection = new Connection('https://mainnet.helius-rpc.com/?api-key=<api-key>');
  
  try {
    const tokenAccountPubKey = new PublicKey(tokenAccountPublicKey);
    const balance = await connection.getTokenAccountBalance(tokenAccountPubKey);

    if (!balance.value) {
        console.log(`Could not find token account: ${tokenAccountPublicKey}`);
        return;
    }

    console.log(`Token Account: ${tokenAccountPublicKey}`);
    console.log(`Raw Amount: ${balance.value.amount}`);
    console.log(`Decimals: ${balance.value.decimals}`);
    console.log(`UI Amount (string): ${balance.value.uiAmountString}`);
    // console.log(JSON.stringify(balance, null, 2)); // For full response details

  } catch (error) {
    console.error(`Error fetching token account balance for ${tokenAccountPublicKey}:`, error);
  }
}

// Replace with an actual SPL Token Account Public Key
const exampleTokenAccount = 'HHisAGTT6ADDd52jY1g65Akn3N2f4jSdQS2rTiyDEw5c'; // Example: An account holding some USDC on mainnet
checkTokenBalance(exampleTokenAccount);

// Example for a token account that might not exist or have 0 balance
// const nonExistentAccount = '11111111111111111111111111111111'; 
// checkTokenBalance(nonExistentAccount);