Sign DataItem

ArConnect Injected API signDataItem() function

The signDataItem() function allows you to create and sign a data item object, compatible with arbundles. These data items can then be submitted to an ANS-104 compatible bundler.



The bundled data item to sign

Note: This function requires the SIGN_TRANSACTION permission.

Warning: The function returns a buffer of the signed data item. You'll need to manually load it into an arbundles DataItem instance as seen in the example usage.

Data item

This function requires a valid data item object, like so:

export interface DataItem {
    data: string | Uint8Array;
    target?: string;
    anchor?: string;
    tags?: {
        name: string;
        value: string;

Example usage

import { DataItem } from "arbundles";

// connect to the extension
await window.arweaveWallet.connect(["SIGN_TRANSACTION"]);

// sign the data item
const signed = await window.arweaveWallet.signDataItem({
    data: "This is an example data",
    tags: [{
        name: "Content-Type",
        value: "text/plain"

// load the result into a DataItem instance
const dataItem = new DataItem(signed);

// now you can submit it to a bunder
await fetch(``, {
    method: "POST",
    headers: {
        "Content-Type": "application/octet-stream"
    body: dataItem.getRaw()

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