# Posting Transactions using Irys (Previously Bundlr)

Posting transactions to irys.xyz can be accomplished using the irys.xyz/sdk JavaScript package. Bundling services enable guaranteed confirmation of posted transactions as well as supporting many thousands of transactions per block though the use of transaction bundles.

# Installing the irys.xyz/client

To install irys.xyz/client run

npm install @irys/sdk

yarn add @irys/sdk

# Initializing Irys Network Client

A difference between posting Layer 1 and bundled Layer 2 transactions is that when using Irys you must make a deposit on the Irys nodeopen in new window ahead of time. This deposit can be made using AR tokens or a variety of other crypto currencies. Another difference is that Irys guarantees your data will arrive on chain.

import Irys from "@irys/sdk";
import fs from "fs";

const url = "https://node1.irys.xyz";
const token = "arweave";
// load the JWK wallet key file from disk
let key = JSON.parse(fs.readFileSync("walletFile.txt").toString());

const irys = new Irys({
	url, // URL of the node you want to connect to
	token, // Token used for payment and signing
	key, // Arweave wallet
});

# Using ArDrive Turbo with Irys

The Irys SDK can post transactions to Turbo, and use Turbo Credits to pay for upload, by setting https://turbo.ardrive.io as the upload url when initializing.

const irys = new Irys({
	url: 'https://turbo.ardrive.io',
	token: 'arweave',
	key //Arweave Wallet
})

# Posting a Bundled Transaction

// Your file
const fileToUpload = "./myImage.png";

// Add a custom tag
// NOTE: The Content-Type tag will be added automatically
const tags = [{ name: "application-id", value: "MyNFTDrop" }];

// Upload the file
try {
	const receipt = await irys.uploadFile(fileToUpload, { tags });
	console.log(`File uploaded ==> https://arweave.net/${receipt.id}`);
} catch (e) {
	console.log("Error uploading file ", e);
}

# Resources

• For an overview of all the ways you can post transactions, see the Posting Transactions section of the cookbook.

• The full Irys client docs can be found on the irys.xyz websiteopen in new window

• A tutorial for uploading NFT assetsopen in new window using Irys.