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POST
/
arweave
/
{path}
Upload to Arweave
curl --request POST \
  --url https://api.inprocess.world/api/arweave/{path} \
  --header 'Content-Type: application/json' \
  --data '{}'
"<string>"
This endpoint is public and does not require authentication.

​
Upload Flow

Uploading to Arweave is a two-step chunked process:
  1. Post the transaction header to /arweave/tx with the signed transaction (data emptied for chunked upload).
  2. Post each chunk to /arweave/chunk sequentially until all chunks are uploaded.
Both requests use Content-Type: application/json.

​
Step 1: Post Transaction Header

curl -X POST "https://api.inprocess.world/api/arweave/tx" \
  -H "Content-Type: application/json" \
  -H "Accept: text/plain" \
  -d '{ "id": "...", "owner": "...", "tags": [...], "data": "", ... }'

​
Step 2: Upload Chunks

curl -X POST "https://api.inprocess.world/api/arweave/chunk" \
  -H "Content-Type: application/json" \
  -H "Accept: text/plain" \
  -d '{ "data_root": "...", "data_size": "...", "data_path": "...", "offset": "...", "chunk": "..." }'

​
JavaScript Example

import Arweave from "arweave";

const arweave = Arweave.init({
  host: "arweave.net",
  port: 443,
  protocol: "https",
});

const uploadToArweave = async (file: File): Promise<string> => {
  const ARWEAVE_KEY = JSON.parse(
    Buffer.from(process.env.NEXT_PUBLIC_ARWEAVE_KEY, "base64").toString()
  );
  const buffer = await file.arrayBuffer();

  const transaction = await arweave.createTransaction({ data: buffer }, ARWEAVE_KEY);
  transaction.addTag("Content-Type", file.type);
  await arweave.transactions.sign(transaction, ARWEAVE_KEY);

  const data = transaction.data;
  const totalChunks = transaction.chunks.chunks.length;

  // Post transaction header (data emptied for chunked upload)
  transaction.data = new Uint8Array(0);
  await fetch("https://api.inprocess.world/api/arweave/tx", {
    method: "POST",
    headers: { "Content-Type": "application/json", Accept: "text/plain" },
    body: JSON.stringify(transaction),
  });

  // Upload each chunk
  for (let i = 0; i < totalChunks; i++) {
    const chunk = transaction.getChunk(i, data);
    await fetch("https://api.inprocess.world/api/arweave/chunk", {
      method: "POST",
      headers: { "Content-Type": "application/json", Accept: "text/plain" },
      body: JSON.stringify(chunk),
    });
  }

  return `ar://${transaction.id}`;
};

Path Parameters

​
path
enum<string>
required

The Arweave path to proxy. Use tx for posting transaction headers or chunk for uploading data chunks.

Available options:
tx,
chunk

Body

application/json

The transaction header or chunk data to upload to Arweave, as JSON.

The body is of type object.

Response

Upload response from Arweave

The response is of type file.