---
title: "Get a genome data package by genome assembly accession"
method: GET
path: "/genome/accession/{accessions}/download"
tags: ["Genome"]
---

# Get a genome data package by genome assembly accession

`GET /genome/accession/{accessions}/download`

## Request

- Base URL: `https://api.ncbi.nlm.nih.gov/datasets/v2`
- URL: `https://api.ncbi.nlm.nih.gov/datasets/v2/genome/accession/{accessions}/download`
- Auth: API key in header `api-key`

Download a genome data package including sequence, annotation, and a detailed data report by genome assembly accession.

## Path parameters

- `accessions` string[], required

## Query parameters

- `chromosomes` string[]
- `include_annotation_type` V2AnnotationForAssemblyType[]
- `hydrated` 'FULLY_HYDRATED' | 'DATA_REPORT_ONLY'
- `filename` string

## Response `200`

A successful response

## Other responses

- `default`: An unexpected error response.

## Changes

- **2026-08-06** `e5d4400c8e5d`: 1 info
  - added the enum value `DEFAULT` to the property `items/` of the `query` request parameter `include_annotation_type`
- **2025-05-08** `6b24249801ec`: 2 breaking
  - for the `query` request parameter `hydrated`, default value `FULLY_HYDRATED` was added
  - removed the enum value `GENOME_GB` from the property `items/` of the `query` request parameter `include_annotation_type`
- **2025-04-28** `f08be9b66e16`: 1 breaking
  - for the `query` request parameter `hydrated`, default value `FULLY_HYDRATED` was removed
- **2025-02-08** `00bdccfc6283`: 3 breaking, 1 info
  - removed the enum value `ASM_STRUCT` from the property `items/` of the `query` request parameter `include_annotation_type`
  - removed the enum value `DEFAULT` from the property `items/` of the `query` request parameter `include_annotation_type`
  - removed the media type `application/json` for the response with the status `default`
  - added the media type `text/plain` for the response with the status `default`

[Operation history](https://skmtc.dev/ncats/apis/ncbi-datasets-api/changes/genome/accession/:accessions/download/get.md)

---

[API](https://skmtc.dev/ncats/apis/ncbi-datasets-api.md) - [All operations](https://skmtc.dev/ncats/apis/ncbi-datasets-api/llms.txt) - [OpenAPI document](https://skmtc.dev/ncats/apis/ncbi-datasets-api/revisions/b24db4bc7ca5?raw)