---
title: "Get a specific custom field"
description: "GET /custom_fields/{custom_field_id} — Returns one contact custom field by ID, including its type and — for select_box and multiple_choice fields — the list of choices available. Anniversary fields also carry reminder_days."
canonical_url: https://developer.onepagecrm.com/api/reference/custom-fields/get-custom_fields-custom_field_id/
source: Markdown mirror of https://developer.onepagecrm.com/api/reference/custom-fields/get-custom_fields-custom_field_id/
---

`GET /custom_fields/{custom_field_id}`

Returns one contact custom field by ID, including its type and — for select_box and multiple_choice fields — the list of choices available. Anniversary fields also carry reminder_days.

Resource: [Custom Fields](https://developer.onepagecrm.com/api/reference/custom-fields/) · [API Reference](https://developer.onepagecrm.com/api/reference/)

## Request

```bash
curl "https://app.onepagecrm.com/api/v3/custom_fields/{custom_field_id}" \
  -u $user_id:$api_key
```

Authentication is HTTP Basic — `user_id` as username, `api_key` as password.
See https://developer.onepagecrm.com/api/authentication/.

## Path parameters

| Name | Type | Description |
| --- | --- | --- |
| `custom_field_id` | string | Custom Field ID |

## Responses

### 200

OK

```json
{
  "status": 0,
  "message": "OK",
  "timestamp": 1528373119,
  "data": {
    "custom_field": {
      "id": "5aad9b039007ba18c9ebad13",
      "name": "Favorite season",
      "type": "select_box",
      "position": 2,
      "choices": [
        "Spring",
        "Summer",
        "Autumn",
        "Winter"
      ]
    }
  }
}
```

Standard error responses: 400, 401, 403, 404, 409, 500 — shared across the API. See https://developer.onepagecrm.com/api/errors/.

## Related guides

- [Authentication](https://developer.onepagecrm.com/api/authentication/)
- [Errors](https://developer.onepagecrm.com/api/errors/)
- [Rate limits](https://developer.onepagecrm.com/api/rate-limits/)