## Attach to a parent chat

`PUT /v1/chats/:dialogId/parent`

Makes the chat a child of another chat, the parent. The parent must allow child chats — a collab does — and the caller needs permission to invite members to the parent: attaching adds the chat's members to the parent chat. Bitrix24 itself rejects anything it does not allow.

## Parameters

| Parameter | Type | Required | Description |
|----------|-----|:-----:|---------|
| `dialogId` (path) | string | yes | The chat that becomes a child, as `chatN`, for example `chat42` — the `dialogId` field of [recent dialogs](/docs/chats/discovery/recent) |

## Request fields (body)

| Field | Type | Required | Description |
|------|-----|:-----:|---------|
| `parentChatId` | number | yes | ID of the parent chat — the `chatId` field of [recent dialogs](/docs/chats/discovery/recent). A positive integer: a number or a digit string without leading zeros |

Other body fields and query parameters are rejected with `400 INVALID_PARAMS` before any call to Bitrix24.

## Examples

### curl — personal key

```bash
curl -X PUT https://vibecode.bitrix24.com/v1/chats/chat42/parent \
  -H "X-Api-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "parentChatId": 40 }'
```

### curl — OAuth application

```bash
curl -X PUT https://vibecode.bitrix24.com/v1/chats/chat42/parent \
  -H "X-Api-Key: YOUR_APP_KEY" \
  -H "Authorization: Bearer USER_SESSION_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{ "parentChatId": 40 }'
```

### JavaScript — personal key

```javascript
const res = await fetch('https://vibecode.bitrix24.com/v1/chats/chat42/parent', {
  method: 'PUT',
  headers: {
    'X-Api-Key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ parentChatId: 40 }),
})

const { success, data } = await res.json()
console.log('Attached:', data.result) // true
```

### JavaScript — OAuth application

```javascript
const res = await fetch('https://vibecode.bitrix24.com/v1/chats/chat42/parent', {
  method: 'PUT',
  headers: {
    'X-Api-Key': 'YOUR_APP_KEY',
    'Authorization': 'Bearer USER_SESSION_TOKEN',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ parentChatId: 40 }),
})

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

## Response fields

| Field | Type | Description |
|------|-----|---------|
| `success` | boolean | Always `true` on success |
| `data.result` | boolean | `true` — the chat is attached |

## Response example

```json
{
  "success": true,
  "data": {
    "result": true
  }
}
```

## Error response example

403 — the parent does not accept child chats, or the caller has no permission to invite members to it:

```json
{
  "success": false,
  "error": {
    "code": "BITRIX_ACCESS_DENIED",
    "message": "ACCESS_DENIED"
  }
}
```

## Errors

| HTTP | Code | Description |
|------|-----|---------|
| 400 | `MISSING_PARAMS` | The `parentChatId` field is missing; a request without a body lands here too |
| 400 | `INVALID_PARAMS` | `parentChatId` is not a positive integer, or another body field or a query parameter was sent, or the body is not a JSON object |
| 403 | `BITRIX_ACCESS_DENIED` | The parent does not accept child chats, or the caller has no permission to invite members to it |
| 404 | `ENTITY_NOT_FOUND` | Bitrix24 returned "not found"; the portal code is in `error.b24Code` |
| 422 | `BITRIX_ERROR` | Bitrix24 returned an error; the portal code is in `error.b24Code`. `CHAT_ALREADY_HAS_PARENT` — the chat already has a parent, detach it first; `WRONG_PARENT_CHAT` — the parent chat does not exist or is the chat itself; `CHAT_NOT_FOUND` — the chat does not exist on the portal |
| 502 | `ME_ALIAS_RESOLUTION_FAILED` | Failed to resolve the user when using the `me` alias |
| 502 | `BITRIX_UNAVAILABLE` | Bitrix24 is unavailable or returned a server error |
| 403 | `SCOPE_DENIED` | The API key does not have the `im` scope |
| 403 | `WRITE_BLOCKED_READONLY_KEY` | The key is read-only — see [access rights](/docs/access-rights) |
| 401 | `TOKEN_MISSING` | The API key has no Bitrix24 tokens configured |

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

## Known specifics

**A regular group chat is never a parent.** A group chat, even an open one, does not accept child chats: attaching to it returns `403 BITRIX_ACCESS_DENIED`.

**Where the parent is shown.** In the [chat card in v2 mode](/docs/chats/discovery/get), a child chat has `chat.parentChatId` set to the parent's ID and `parentChat` set to a short card of the parent if you have access to it. Otherwise `parentChat` is `null`.

## See also

- [Detach from the parent chat](/docs/chats/management/parent-delete)
- [Chat management](/docs/chats/management)
- [Dialog details](/docs/chats/discovery/get)
- [Add members](/docs/chats/members/add)