> For the complete documentation index, see [llms.txt](https://dev.guardian.hedera.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.guardian.hedera.com/developer-tools-and-resources/api-reference/system-schema-apis/creates-new-system-schema.md).

# Creates New System Schema

**`POST /schemas/system/{username}`**

Creates new system schema. Only users with the Standard Registry role are allowed to make the request.

**Authentication:** Bearer token required (`Authorization: Bearer <token>`)

**Permission:** `Permissions.SCHEMAS_SYSTEM_SCHEMA_CREATE`

***

## Request

### Path Parameters

| Parameter  | Type   | Required | Description |
| ---------- | ------ | -------- | ----------- |
| `username` | String | Yes      | Username    |

### Request Body

A valid schema object.

```json
{
  "name": "System schema name",
  "description": "Description",
  "entity": "string",
  "document": {}
}
```

***

## Response

### Success Response

**Status:** `201 Created`

### Error Responses

| Status                      | Description               |
| --------------------------- | ------------------------- |
| `401 Unauthorized`          | Missing or invalid token  |
| `403 Forbidden`             | Insufficient permissions  |
| `422 Unprocessable Entity`  | Validation error          |
| `500 Internal Server Error` | Unexpected server failure |