---
title: "Upload a part of a multipart upload"
method: PUT
path: "/bus/multipart/part"
tags: ["bus"]
---

# Upload a part of a multipart upload

`PUT /bus/multipart/part`

Adds a part to an ongoing multipart upload.

## Request body

- object
  - `bucket` string — The name of the bucket.
  - `eTag` string — An ETag representing a resource
  - `key` string
  - `uploadID` string, byte — A 32-byte unique identifier represented as a hex string.
  - `partNumber` integer — The number of this part
  - `slices` SlabSlice[]
    - `slab` Slab — A slab of data to migrate
      - `health` number, float
      - `encryptionKey` string — The encryption key used to encrypt the slab's shards
      - `minShards` integer — The number of data shards the slab is split into
    - `offset` integer
    - `limit` integer

## Response `200`

Successfully uploaded part

## Other responses

- `400` — Invalid request parameters
- `500` — Internal server error

## Changes

- **2025-01-23** `c38282599c5a` — 2 breaking
  - added `#/components/schemas/RedundancySettingsMinShards, subschema #2` to the `slices/items/slab/minShards` request property `allOf` list
  - the `slices/items/slab/minShards` request property type/format changed from `integer`/`uint8` to ``/``
- **2024-12-18** `922f156353c9` — 1 breaking, 1 info
  - removed the media type `text/plain` for the response with the status `500`
  - api tag `bus` added
- **2024-12-17** `a3a866454789` — 1 info
  - endpoint added
- **2024-12-09** `f062c35d8f47` — 1 breaking
  - api path removed without deprecation

[Change history](https://skmtc.dev/siafoundation/apis/renterd-api/changes/bus/multipart/part/put.md)

---

[API](https://skmtc.dev/siafoundation/apis/renterd-api.md) · [All operations](https://skmtc.dev/siafoundation/apis/renterd-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/siafoundation/renterd-api/revisions/184a3d5207da/schema)