> 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/guardian/standard-registry/schemas/schema-creation-using-apis/previews-list-of-schemas-duplicates.md).

# Previews list of schemas duplicates

**`POST /schemas/import/schemas/duplicates`**

Previews list of schema duplicates. Only users with the Standard Registry role are allowed to make the request.

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

**Permission:** `Permissions.SCHEMAS_SCHEMA_CREATE`

***

## Request

### Request Body

```json
{
  "schemaNames": ["Schema A", "Schema B"],
  "policyId": "f3b2a9c1e4d5678901234567"
}
```

| Field         | Type      | Required | Description                                   |
| ------------- | --------- | -------- | --------------------------------------------- |
| `schemaNames` | String\[] | Yes      | Array of schema names to check for duplicates |
| `policyId`    | String    | Yes      | Policy ID                                     |

***

## Response

### Success Response

**Status:** `200 OK`

Returns an array of schema objects that are duplicates.

```json
[
  {
    "id": "f3b2a9c1e4d5678901234567",
    "uuid": "f3b2a9c1e4d5678901234567",
    "name": "Schema name",
    "status": "PUBLISHED"
  }
]
```

### Error Responses

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