# List concepts

> Every concept a field, option or output refers to.

`GET https://api.refabric.com/v1/concepts`

**Authentication.** No key: the reference is the same for every reader and shows nothing of an account.

**Common use cases**

- Explain a field to your users in Refabric's own words.

**See also**

- `GET /v1/concepts/{name}`

Authentication: none — this operation needs no key.

## Header parameters

- `Refabric-Version` (string, _optional_, format: date) — The contract version you wrote against (a date). Absent: the current version.
- `X-Request-ID` (string, _optional_, max length 128) — Your own id for this request; we answer it back under X-Client-Request-ID.

## Response 200

Done: the answer is in the body.

- `items` (array<object>, _required_) — The concepts.
  - `name` (string, _required_) — The concept's name.
    Example: `moodboard`
  - `short` (string, _required_) — What it is, in one line.
    Example: `A set of images.`
  - `long` (string, _required_) — What it is, in full.
    Example: `A moodboard collects …`
  - `related` (array<string>, _required_) — Concepts next to it.
    Example: `["brand_kit"]`
  - `produced_by` (array<string>, _required_) — The tasks that make it.
    Example: `["moodboard.create"]`
  - `used_by` (array<string>, _required_) — The tasks that take it as an input.
    Example: `["image.generate"]`

```json
{
  "items": []
}
```

## Response 401

No valid API key was sent.

```json
{
  "error": {
    "code": "string",
    "type": "invalid_request",
    "message": "string",
    "field": "string",
    "retryable": true,
    "docs": "string",
    "request_id": "string",
    "ctx": {
      "required": 0,
      "balance": 0,
      "retry_after": 0
    },
    "input": null,
    "job_id": "string",
    "required": 0,
    "balance": 0
  }
}
```

## Response 403

Your key or your plan does not allow this.

```json
{
  "error": {
    "code": "string",
    "type": "invalid_request",
    "message": "string",
    "field": "string",
    "retryable": true,
    "docs": "string",
    "request_id": "string",
    "ctx": {
      "required": 0,
      "balance": 0,
      "retry_after": 0
    },
    "input": null,
    "job_id": "string",
    "required": 0,
    "balance": 0
  }
}
```

## Response 429

Too many requests: wait for the number of seconds in the Retry-After header.

```json
{
  "error": {
    "code": "string",
    "type": "invalid_request",
    "message": "string",
    "field": "string",
    "retryable": true,
    "docs": "string",
    "request_id": "string",
    "ctx": {
      "required": 0,
      "balance": 0,
      "retry_after": 0
    },
    "input": null,
    "job_id": "string",
    "required": 0,
    "balance": 0
  }
}
```

## Response 500

Something went wrong on our side; retry, and quote the request id if it keeps happening.

```json
{
  "error": {
    "code": "string",
    "type": "invalid_request",
    "message": "string",
    "field": "string",
    "retryable": true,
    "docs": "string",
    "request_id": "string",
    "ctx": {
      "required": 0,
      "balance": 0,
      "retry_after": 0
    },
    "input": null,
    "job_id": "string",
    "required": 0,
    "balance": 0
  }
}
```

## Request

```python
import requests

url = "https://api.refabric.com/v1/concepts"

response = requests.get(url)

print(response.json())
```

```javascript
const url = 'https://api.refabric.com/v1/concepts';
const options = {method: 'GET'};

try {
    const response = await fetch(url, options);
    const data = await response.json();
    console.log(data);
} catch (error) {
    console.error(error);
}
```

```bash
curl --request GET \
    --url https://api.refabric.com/v1/concepts
```