---
title: "Get a single concept (deprecated)"
method: GET
path: "/concepts/{id}"
tags: ["Concepts"]
deprecated: true
---

# Get a single concept (deprecated)

`GET /concepts/{id}`

> **Deprecated.**

**DEPRECATED:** Use Topics instead. Retrieve a single concept by OpenAlex ID.

## Path parameters

- `id` string, required

## Query parameters

- `select` string
- `api_key` string, required

## Response `200`

Successful response

- Concept — Legacy research area taxonomy (deprecated)
  - `id` string — The OpenAlex ID for this concept.
  - `display_name` string — The name of the concept.
  - `description` string — A description of this concept.
  - `level` integer — The hierarchical level (0 = top level, higher = more specific).
  - `wikidata` string — The Wikidata ID for this concept.
  - `ids` object — External identifiers:
    - `openalex` string
    - `wikidata` string
    - `wikipedia` string
    - `mag` integer, nullable
  - `image_url` string, nullable — URL for an image representing this concept.
  - `image_thumbnail_url` string, nullable — Smaller version of `image_url`.
  - `works_count` integer — The number of works tagged with this concept.
  - `cited_by_count` integer — Total citations to works tagged with this concept.
  - `ancestors` unknown[], nullable — Parent concepts in the hierarchy.
    - unknown
  - `related_concepts` unknown[], nullable — Related concepts with similarity scores.
    - unknown
  - `counts_by_year` unknown[], nullable — `works_count` and `cited_by_count` for each of the last ten years.
    - unknown
  - `works_api_url` string — A URL that returns all works tagged with this concept.
  - `created_date` string, date — When this concept was added to OpenAlex (ISO 8601 date).
  - `updated_date` string, date-time — When this concept was last updated (ISO 8601 datetime).

## Other responses

- `404` — Entity not found
- `429` — Rate limit exceeded

---

[API](https://skmtc.net/openalex/apis/openalex-api.md) · [All operations](https://skmtc.net/openalex/apis/openalex-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/openalex/openalex-api/versions/60b6c8bd0799/schema)