Post signed data to Arweave using @liteseed/sdk

In this tutorial, we will walkthrough the process of uploading data to Arweave using the @liteseed/sdk.

Installing the required packages

This tutorial requires the installation of the @liteseed/sdk.

npm install @liteseed/sdk

@liteseed/sdk is the official js library for interacting with the Liteseed for js/ts.

Uploading Data

The sdk makes it very easy to upload data.

Initializing the SDK

First, you must create a new instance of Liteseed with the private key (JWK) you will use to sign and upload the data.

import { readFileSync } from "fs";
import { Liteseed } from "@liteseed/sdk";

const jwk = JSON.parse(readFileSync("./arweave.json").toString());
const liteseed = new Liteseed(jwk);

Signing the data

You can convert any data into a special arweave transaction using signData.

 const data = readFileSync("image.jpeg");
 const dataItem = await liteseed.signData({ data });

Store the id in a database, so you can query your data later easily.

Posting the signed data

Next, you must pay for the upload to complete the process. You can check for the price of upload as follows.

  const receipt = await liteseed.postSignedData({ dataItem });
  console.log(receipt);

The receipt object looks something like the following The response would look something like this

{
  "id": "kscLYZ3UHdCUZAimSr6wrSl5v-ll8uOQr_G8ZQ4osYA",
  "dataCaches": ["api.liteseed.xyz"],
  "fastFinalityIndexes": ["api.liteseed.xyz"],
  "deadlineHeight": 1470374,
  "owner": "...",
  "version": "1.0.0"
}

Make the payment

Finally, you need to simply make the payment.

  const payment = await liteseed.sendPayment({ dataItem });
  console.log(payment);

The Complete Example

Here’s the complete code for uploading a data-item using the @liteseed/sdk.

import { readFileSync } from "node:fs";
import { Liteseed } from "@liteseed/sdk";

const jwk = JSON.parse(readFileSync("./arweave.json").toString());
const liteseed = new Liteseed(jwk);
const data = readFileSync("image.jpeg");

async function upload(data) {
  const dataItem = await liteseed.signData({ data });
  const receipt = await liteseed.postSignedData({ dataItem });
  console.log(receipt);
  const payment = await liteseed.sendPayment({ dataItem });
  console.log(payment);
}

upload(data);