Browser Upload SDK

The Browser Upload SDK is equipped with multi-chain storage capabilities powered by Spheron.


The package is only meant for Browser environments.


Using NPM

npm i @spheron/browser-upload

Using Yarn

yarn add @spheron/browser-upload


The Browser SDK allows you to upload files directly from your browser to IPFS, Filecoin or Arweave.
To use the Browser SDK, you have to set up the following:

  1. A web server that will be used by the frontend to get the uploadToken for uploading the data.
  2. A web app that uses @spheron/browser-upload to upload files directly from browser.

You can checkout the working example here (opens in a new tab).


You have to set up a web server with an endpoint that will be used by the frontend to fetch the token for upload. In the example, we have created a /initiate-upload endpoint. Make use of the createSingleUploadToken method from @spheron/storage package to generate the uploadToken.

NOTE: The uploadToken can only be used for a single upload and has an expiration of 10 minutes.

import { SpheronClient, ProtocolEnum } from "@spheron/storage";
app.get("/initiate-upload", async (req, res, next) => {
  try {
    const bucketName = "example-browser-upload"; // use your preferred name
    const protocol = ProtocolEnum.IPFS; // use your preferred protocol
    const token = process.env.SPHERON_TOKEN; // add your access token in .env or paste it here
    const client = new SpheronClient({ token });
    const { uploadToken } = await client.createSingleUploadToken({
      name: bucketName,
  } catch (error) {

You need to Create an Access Token to create the client.

NOTE: Please choose web app type in the dashboard while generating the Access Token.

Function createSingleUploadToken takes two parameters:

  • name - (string) - Represents the name of the bucket on which you are uploading the data.
  • protocol - (string) - The protocol on which the data will be uploaded. The supported protocols are [ ARWEAVE, IPFS, FILECOIN].


interface TokenRes {
  uploadToken: string;


You have to send a request to your server to create the uploadToken that will be used to upload files from the browser. In the example, we are sending a request to the /initiate-upload endpoint. Make use of the upload method from @spheron/browser-upload to upload your files.

NOTE: The uploadToken can only be used for a single upload and has an expiration of 10 minutes.

import { upload } from "@spheron/browser-upload";
const response = await fetch(`<BACKEND_URL>/initiate-upload`); // get the temporary access token from server
const resJson = await response.json();
const token =  resJson.uploadToken;
let currentlyUploaded = 0;
const { uploadId, bucketId, protocolLink, dynamicLinks } = await upload(files, {
  onChunkUploaded: (uploadedSize, totalSize) => {
    currentlyUploaded += uploadedSize;
    console.log(`Uploaded ${currentlyUploaded} of ${totalSize} Bytes.`);

This flow allows you to control who can use your uploadToken to upload files.
Function upload takes two parameters:

  • files - ( File[] | FileList ) - An array of files to be uploaded.
  • configuration: An object with the following parameters:
    1. configuration.token
      • The upload token that was fetched from server.
    2. configuration.onChunkUploaded (Optional)
      • callback function (uploadedSize: number, totalSize: number) => void. The function will be called multiple times, depending on the upload size. The function will be called each time a chunk is uploaded, with two parameters. the first one uploadedSize represents the size in Bytes for the uploaded chunk. The totalSize represents the total size of the upload in Bytes.


interface UploadRes {
  uploadId: string;
  bucketId: string;
  protocolLink: string;
  dynamicLinks: string[];
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