# Create folder

Create a folder under a volume or existing folder.

```text
POST $CLOUDSIGMA_API_BASE/catalog/folder/create
```

## Before you call this API

Configure the [regional API endpoint and authentication](https://omnifabric.cloudsigma.com/docs/developer/endpoints-and-authentication.html.md), and select the target workspace.

First [query the object](https://omnifabric.cloudsigma.com/docs/reference/api/ai-studio/resource-center/catalog/list-database-objects.html.md) in the database to obtain the parent volume or parent folder ID.

Set the operation-specific values used in the request:

- `$VOLUME_ID`: Parent volume or parent folder ID; the service resolves this to the root volume.

The caller needs write access to the root volume.

## Request example

```bash
curl -X POST "$CLOUDSIGMA_API_BASE/catalog/folder/create" \
  -H "X-API-Key: $CLOUDSIGMA_API_KEY" \
  -H "X-Workspace-ID: $WORKSPACE_ID" \
  -H 'Content-Type: application/json' \
  -d '{
    "parent_volume_id": '"$VOLUME_ID"',
    "database_id": '"$DATABASE_ID"',
    "name": "<FOLDER_NAME>",
    "description": "<FOLDER_DESCRIPTION>"
  }'
```

## Request body

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `parent_volume_id` | integer | Yes | The parent volume or parent folder ID; the service resolves this to the root volume. |
| `database_id` | integer | Yes | Database ID. |
| `name` | string | Yes | Folder name, must be a valid identifier. |
| `description` | string | No | Folder description. |

## Successful response

Returns `200` and the new folder ID on success. The caller needs write access to the root volume and the parent database.

```json
{
  "code": "OK",
  "msg": "OK",
  "data": {
    "id": "901"
  }
}
```

The response fields are as follows.

| Field | Type | Description |
| --- | --- | --- |
| `code` | string | `OK` on success. |
| `msg` | string | `OK` on success. |
| `data.id` | string | ID of the newly created folder, returned as a numeric string. When calling subsequent endpoints that require an integer ID, use this numeric value itself. |

## Error response

```json
{
  "code": "ErrParamInvalid",
  "msg": "name 无效",
  "data": null
}
```

### Common HTTP errors

```{list-table}
:header-rows: 1
:widths: 12 22 32 34

* - HTTP status code
  - error code
  - Common causes
  - Recommended actions
* - `400`
  - `ErrParamInvalid`
  - `parent_volume_id`, `name` are missing, or have invalid names.
  - Check parent object ID and folder name.
* - `403`
  - `ErrForbidden`
  - The current identity does not have write permissions to the root volume.
  - Use credentials with write access, or contact your administrator for authorization.
* - `409`
  - `ErrReadonly`
  - The database where the target volume is located is not writable.
  - Select a writable volume.
* - `500`
  - `ErrServer`
  - The service cannot create the folder.
  - Record the request time and error message and try again; if it continues to fail, contact support.
```

## Follow-up operations

Log `data.id`. Use this ID to [Query Catalog details](https://omnifabric.cloudsigma.com/docs/reference/api/ai-studio/resource-center/catalog/get-catalog.html.md) to confirm the saving result.