Algorand Asset OptIn using KMD (JS)

gistfile1.txt

const algosdk = require('algosdk');

// Algod
algod_token = 'a'.repeat(64);
algod_server = 'http://127.0.0.1';
algod_port = 4001;
algod_client = new algosdk.Algodv2(algod_token, algod_server, algod_port);

// KMD
kmd_token = 'a'.repeat(64);
kmd_server = 'http://127.0.0.1';
kmd_port = 4002;
kmd_client = new algosdk.Kmd(kmd_token, kmd_server, kmd_port);

(async () => {
    // Get Wallet ID
    wallet = await kmd_client.listWallets();
    wallet_id = wallet.wallets[0].id;

    // Initiate Wallet Handle
    handle = await kmd_client.initWalletHandle(wallet_id);
    wallet_handle_token = handle.wallet_handle_token;

    // Select first address from the wallet
    keys = await kmd_client.listKeys(wallet_handle_token);
    pk = keys.addresses[0];

    // Get Suggested Params
    sp = await algod_client.getTransactionParams().do();

    // Construct OptIn Transaction
    axfer_txn = algosdk.makeAssetTransferTxnWithSuggestedParamsFromObject(
        {
            from: pk,
            to: pk,
            assetIndex: 3, // AssetID
            amount: 0,
            suggestedParams: sp,
        }
    )
    
    // Sign Transaction with KMD
    axfer_stxn = await kmd_client.signTransaction(
        wallet_handle_token,
        "",
        axfer_txn,
        pk,
    );

    // Submit Transaction to node
    const { txId } = await algod_client.sendRawTransaction(axfer_stxn).do();
    const result = await algosdk.waitForConfirmation(algod_client, txId, 3);
    console.log(result);
})();