# Create a document folder

> Creates a folder in a trip's documents, as New folder does.

`POST /v1/trips/{tripId}/document-folders`

Creates a folder in a trip's documents, as New folder does. File documents into it with PATCH /documents/{documentId}. Undo with POST /changes/{changeId}/revert while it is still empty.

**Permissions:** `documents:write` · **Kind:** write · **Cost:** 1 unit · MCP tool [`create_document_folder`](https://api.bymundi.com/docs/mcp/tools/create_document_folder.md)

Undoable: the response carries `Bymundi-Change-Id`; [revert it](https://api.bymundi.com/docs/guides/undo-and-dry-run.md) with `POST /v1/changes/{changeId}/revert`.

## Path parameters

| Field | Type | Required | Description |
|---|---|---|---|
| `tripId` | uuid | yes |  |

## Body

| Field | Type | Required | Description |
|---|---|---|---|
| `name` | string | yes | As travelers will see it, e.g. 'Flights', 'Hotels', 'Insurance'. max 200 chars |

## Response `201`

| Field | Type | Required | Description |
|---|---|---|---|
| `object` | "document_folder" | yes |  |
| `id` | uuid | yes |  |
| `tripId` | uuid | yes |  |
| `name` | string | yes |  |
| `documentCount` | integer | yes | Ready documents filed in it. ≥ 0 |
| `createdAt` | string | yes |  |

## Errors

Errors are [problem details](https://api.bymundi.com/docs/guides/errors.md). Besides the refusals described above, any call like this one can return:

- [`invalid_request`](https://api.bymundi.com/problems/invalid_request.md) — Invalid request
- [`unauthorized`](https://api.bymundi.com/problems/unauthorized.md) — Missing or invalid API key
- [`insufficient_scope`](https://api.bymundi.com/problems/insufficient_scope.md) — Missing permission
- [`rate_limited`](https://api.bymundi.com/problems/rate_limited.md) — Rate limit reached
- [`not_found`](https://api.bymundi.com/problems/not_found.md) — Not found
- [`idempotency_key_reused`](https://api.bymundi.com/problems/idempotency_key_reused.md) — Idempotency-Key reused
- [`request_in_progress`](https://api.bymundi.com/problems/request_in_progress.md) — Request in progress

## Examples

#### curl

```bash
curl -X POST https://api.bymundi.com/v1/trips/$TRIP_ID/document-folders \
  -H "Authorization: Bearer $BYMUNDI_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{"name":"string"}'
```

#### JavaScript

```javascript
const res = await fetch(`https://api.bymundi.com/v1/trips/${tripId}/document-folders`, {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.BYMUNDI_KEY}`,
    "Content-Type": "application/json",
    "Idempotency-Key": crypto.randomUUID(),
  },
  body: JSON.stringify({"name":"string"}),
});
if (!res.ok) throw new Error((await res.json()).detail);
const data = await res.json();
```

#### Python

```python
import os, uuid, requests

res = requests.post(
    f"https://api.bymundi.com/v1/trips/{tripId}/document-folders",
    headers={"Authorization": f"Bearer {os.environ['BYMUNDI_KEY']}", "Idempotency-Key": str(uuid.uuid4())},
    json={"name":"string"},
)
res.raise_for_status()
data = res.json()
```