---
title: "GET /classes/"
method: GET
path: "/classes/"
tags: ["Administrative Endpoints"]
---

# GET /classes/

`GET /classes/`

Retrieves all OpenAtlas classes with their English label, CIDOC CRM mapping, view, icon and standard type ID.

## Response `200`

Success

- object[]
  - `systemClass` string, nullable, required
  - `crmClass` string, nullable, required
  - `view` string, nullable, required
  - `icon` string, nullable, required
  - `en` string, nullable, required

## Other responses

- `400` — Bad Request
- `401` — Unauthorized
- `403` — Access denied
- `404` — Resource not found
- `409` — Conflict
- `500` — Internal server error

## Changes

- **2025-12-03** `008688998b83` — 11 breaking
  - the response property `items/crmClass` became nullable for the status `200`
  - the response property `items/en` became nullable for the status `200`
  - the response property `items/icon` became nullable for the status `200`
  - the response property `items/systemClass` became nullable for the status `200`
  - …7 more
- **2025-12-02** `26f86ddcd57c` — 9 info
  - added `#/components/schemas/ApiError, subschema #2` to the response body `allOf` list for the response status `404`
  - added `#/components/schemas/ApiError, #/components/schemas/ParameterError, subschema #3` to the response body `anyOf` list for the response status `400`
  - removed `#/components/schemas/ErrorModel, #/components/schemas/ParameterErrorModel` from the response body `oneOf` list for the response status `400`
  - removed `#/components/schemas/ErrorModel, #/components/schemas/ParameterErrorModel` from the response body `oneOf` list for the response status `404`
  - …5 more
- **2025-12-02** `676032e96b3f` — 3 info
  - added the media type `application/json` for the response with the status `404`
  - added the non-success response with the status `400`
  - added the non-success response with the status `405`
- …earlier changes not shown

[Full history](https://skmtc.dev/craws/apis/openatlas-api/changes/classes/get.md)

---

[API](https://skmtc.dev/craws/apis/openatlas-api.md) · [All operations](https://skmtc.dev/craws/apis/openatlas-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/craws/openatlas-api/revisions/bbd340468fc9/schema)