---
title: "Get all ontology versions"
method: GET
path: "/v2/ontology/ontology-versions"
tags: ["Ontology"]
---

# Get all ontology versions

`GET /v2/ontology/ontology-versions`

## Request

- Base URL: `https://api.carbonarc.co` (the document declares no server; this is the origin it was published from)
- URL: `https://api.carbonarc.co/v2/ontology/ontology-versions`
- Auth: none declared

## Response `200`

Successful Response

- OntologyVersionResponse
  - `versions` string[], required

## Other responses

- `404`: Not Found
- `422`: Validation Error

## Changes

- **2026-10-22** `4b55ac4735ad`: 1 breaking
  - removed the request body

[Operation history](https://skmtc.dev/carbonarc/apis/carbon-arc-api-documentation/changes/v2/ontology/ontology-versions/get.md)

---

[API](https://skmtc.dev/carbonarc/apis/carbon-arc-api-documentation.md) - [All operations](https://skmtc.dev/carbonarc/apis/carbon-arc-api-documentation/llms.txt) - [OpenAPI document](https://skmtc.dev/carbonarc/apis/carbon-arc-api-documentation/revisions/4b55ac4735ad?raw)