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A finalized transaction can be broadcasted to the network or serialized (to a byte representation) using Stacks.js.

import { bytesToHex } from '@stacks/common';
import { makeSTXTokenTransfer, broadcastTransaction, AnchorMode } from '@stacks/transactions';

const broadcastResponse = await broadcastTransaction(transaction);
const txId = broadcastResponse.txid;

const serializedTx = tx.serialize(); // Uint8Array
const serializedTxHex = bytesToHex(serializedTx); // hex string

Info

For web applications, user wallets can broadcast transactions via @stacks/connect.

Broadcasting