## List custom fields

`GET https://getkollek.com/api/collection-types/{collectionType}/custom-fields`

Retrieve the custom fields of a collection type, in position order. A custom field is a field definition on a type, such as Issue # on Comics or Vintage on Wine. Its group_id tells you the group it sits in, and is null when the field is standalone.

**Permissions:** Any member of the account.

### Path parameters

- `collectionType` (integer, required): The ID of the collection type the field belongs to.

### Query parameters

- `per_page` (integer, optional): The number of custom fields to return per page, between 1 and 100. Default: `10`.
- `page` (integer, optional): The page number to return. Default: `1`.

**Returns:** A paginated list of custom_field objects.

### Example request

```bash
curl https://getkollek.com/api/collection-types/1/custom-fields \
  -H "Authorization: Bearer $API_KEY" \
  -H "Accept: application/json"
```

### Example response

`Status: 200`

```json
{
    "data": [
        {
            "type": "custom_field",
            "id": "1",
            "attributes": {
                "name": "Issue #",
                "field_type": "number",
                "options": null,
                "position": 1,
                "group_id": "1",
                "created_at": 1752537600,
                "updated_at": 1752537600
            },
            "links": {
                "self": "https://getkollek.com/api/collection-types/1/custom-fields/1"
            }
        },
        {
            "type": "custom_field",
            "id": "2",
            "attributes": {
                "name": "Grade",
                "field_type": "select",
                "options": [
                    "NM",
                    "VF",
                    "FN"
                ],
                "position": 1,
                "group_id": null,
                "created_at": 1752537600,
                "updated_at": 1752537600
            },
            "links": {
                "self": "https://getkollek.com/api/collection-types/1/custom-fields/2"
            }
        }
    ],
    "links": {
        "first": "https://getkollek.com/api/collection-types/1/custom-fields?page=1",
        "last": "https://getkollek.com/api/collection-types/1/custom-fields?page=1",
        "prev": null,
        "next": null
    },
    "meta": {
        "current_page": 1,
        "from": 1,
        "last_page": 1,
        "links": [
            {
                "url": null,
                "label": "« Previous",
                "active": false
            },
            {
                "url": "https://getkollek.com/api/collection-types/1/custom-fields?page=1",
                "label": "1",
                "active": true
            },
            {
                "url": null,
                "label": "Next »",
                "active": false
            }
        ],
        "path": "https://getkollek.com/api/collection-types/1/custom-fields",
        "per_page": 10,
        "to": 2,
        "total": 2
    }
}
```