## Create a field

`POST /v1/lists/:iblockId/fields`

Creates a new field in a list. The field definition is passed in the `fields` object in Bitrix24 format — property names in uppercase.

## Parameters

| Parameter | Type | Required | Description |
|----------|-----|:-----:|---------|
| `iblockId` (path) | string | yes | List identifier — numeric `IBLOCK_ID` or symbolic `IBLOCK_CODE`. List of lists: `GET /v1/lists` |

## Request fields (body)

| Field | Type | Required | Description |
|------|-----|:-----:|---------|
| `iblockTypeId` | string | no | Info block type. Values:<br>`lists` — regular lists, default<br>`lists_socnet` — workgroup lists<br>`bitrix_processes` — service workflows |
| `fields` | object | yes | Properties of the new field in Bitrix24 format (uppercase) |
| `fields.NAME` | string | yes | Field name |
| `fields.TYPE` | string | yes | Field type. Allowed values — [Field types](/docs/lists/fields/field-types) |
| `fields.CODE` | string | yes | Field symbolic code. Without it the request ends with a `422 BITRIX_ERROR` response |
| `fields.IS_REQUIRED` | string | no | Whether the field is required: `Y` or `N` |
| `fields.MULTIPLE` | string | no | Multiple value: `Y` or `N` |
| `fields.SORT` | number | no | Field sort index in the card |
| `fields.DEFAULT_VALUE` | string | no | Default value |

## Examples

### curl — personal key

```bash
curl -X POST https://vibecode.bitrix24.com/v1/lists/23/fields \
  -H "X-Api-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "fields": {
      "NAME": "Status",
      "TYPE": "S",
      "CODE": "STATUS"
    }
  }'
```

### curl — OAuth application

```bash
curl -X POST https://vibecode.bitrix24.com/v1/lists/23/fields \
  -H "X-Api-Key: YOUR_APP_KEY" \
  -H "Authorization: Bearer USER_SESSION_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "fields": {
      "NAME": "Status",
      "TYPE": "S",
      "CODE": "STATUS"
    }
  }'
```

### JavaScript — personal key

```javascript
const res = await fetch('https://vibecode.bitrix24.com/v1/lists/23/fields', {
  method: 'POST',
  headers: {
    'X-Api-Key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    fields: {
      NAME: 'Status',
      TYPE: 'S',
      CODE: 'STATUS',
    },
  }),
})

const { success, data } = await res.json()
console.log('Field ID:', data.id)
```

### JavaScript — OAuth application

```javascript
const res = await fetch('https://vibecode.bitrix24.com/v1/lists/23/fields', {
  method: 'POST',
  headers: {
    'X-Api-Key': 'YOUR_APP_KEY',
    'Authorization': 'Bearer USER_SESSION_TOKEN',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    fields: {
      NAME: 'Status',
      TYPE: 'S',
      CODE: 'STATUS',
    },
  }),
})

const { success, data } = await res.json()
```

## Response fields

| Field | Type | Description |
|------|-----|---------|
| `success` | boolean | Always `true` on success |
| `data.id` | string | Identifier of the created field in the format `PROPERTY_<number>` |

## Response example

```json
{
  "success": true,
  "data": {
    "id": "PROPERTY_1177"
  }
}
```

## Error response example

422 — `CODE` not passed:

```json
{
  "success": false,
  "error": {
    "code": "BITRIX_ERROR",
    "message": "Please fill the code fields"
  }
}
```

## Errors

| HTTP | Code | Description |
|------|-----|---------|
| 400 | `INVALID_IBLOCK_TYPE` | `iblockTypeId` is not one of `lists`, `bitrix_processes`, `lists_socnet` |
| 400 | `MISSING_REQUIRED_FIELDS` | The `fields` object is missing or lacks `NAME` / `TYPE` |
| 422 | `BITRIX_ERROR` | Bitrix24 rejected the creation. For example, `CODE` is not filled — message «Please fill the code fields» |
| 403 | `BITRIX_ACCESS_DENIED` | No permission to edit the list |
| 403 | `WRITE_BLOCKED_READONLY_KEY` | The key is in read-only mode |
| 403 | `SCOPE_DENIED` | The key lacks the `lists` scope |
| 401 | `TOKEN_MISSING` | The key has no configured tokens |
| 409 | `LISTS_MODULE_NOT_ENABLED` | The «Lists» module is not enabled on the portal |

Full list of common API errors — [Errors](/docs/errors).

## Known specifics

**The field code is required on creation.** A field is created only when `CODE` is passed in `fields`. Without it the request ends with a `422 BITRIX_ERROR` response and the message «Please fill the code fields», even though `NAME` and `TYPE` are filled.

## See also

- [Field types](/docs/lists/fields/field-types)
- [Update a field](/docs/lists/fields/update)
- [List fields](/docs/lists/fields)