arweave.js

import Arweave from "arweave";
import dotenv from "dotenv";
dotenv.config();

const arweave = Arweave.init({
  host: "arweave.net",
  port: 443,
  protocol: "https",
  timeout: 20000, // Network request timeouts in milliseconds
  logging: false, // Disable network request logging
});

// Submits a transaction and reads the data
async function run() {
  // The data we're uploading
  const imageDataUri =
    "data:image/png;base64,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";
  const imageBuffer = Buffer.from(imageDataUri.split(",")[1], "base64");

  // Create and submit transaction
  const key = JSON.parse(process.env.KEY);
  const transaction = await arweave.createTransaction(
    {
      data: imageBuffer,
    },
    key
  );

  await arweave.transactions.sign(transaction, key);
  await arweave.transactions.post(transaction);

  // Transaction ID gets updated after arweave.transactions.post, which is a bit unintuitive
  console.log("transaction ID", transaction.id);

  // Read data back
  const transactionData = await arweave.transactions.getData(transaction.id);
  console.log(
    "transaction data",
    Buffer.from(transactionData, "base64").toString()
  );
}

run();