> 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/api-reference/system-schemas-apis.md).

# System Schema APIs

The System Schemas APIs provide endpoints for managing Guardian built-in system schemas, such as Standard Registry, User, Policy, and Token schemas that underpin the platform's own data structures.

**Base URL:** `/api/v1/schemas/system`

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## Endpoints

| Method       | Endpoint                                | Description                                         | Auth Required |
| ------------ | --------------------------------------- | --------------------------------------------------- | ------------- |
| **`POST`**   | `/schemas/system/{username}`            | Creates a new system schema                         | Yes           |
| **`GET`**    | `/schemas/system/{username}`            | Returns system schemas by username                  | Yes           |
| **`PUT`**    | `/schemas/system/{schemaId}`            | Updates the specified system schema                 | Yes           |
| **`PUT`**    | `/schemas/system/{schemaId}/active`     | Makes the schema active (publishes it)              | Yes           |
| **`DELETE`** | `/schemas/system/{schemaId}`            | Deletes the specified system schema (async)         | Yes           |
| **`GET`**    | `/schemas/system/entity/{schemaEntity}` | Returns the active schema for the given entity type | Yes           |
| **`GET`**    | `/schemas/type/{schemaType}`            | Returns schema by JSON document type string         | Yes           |

***

## Endpoint Details

* [Creates New System Schema](/developer-tools/api-reference/system-schemas-apis/creates-new-system-schema.md)
* [Returns Schema by Username](/developer-tools/api-reference/system-schemas-apis/returns-schema-by-username.md)
* [Updates the Schema](/developer-tools/api-reference/system-schemas-apis/updates-the-schema.md)
* [Publishes the Schema (Make Active)](/developer-tools/api-reference/system-schemas-apis/publishes-the-schema.md)
* [Delete System Schema](/developer-tools/api-reference/system-schemas-apis/delete-system-schema.md)
* [Returns Schema by Entity Type](/developer-tools/api-reference/system-schemas-apis/schema-type.md)
* [Returns Schema by Schema Type](/developer-tools/api-reference/system-schemas-apis/returns-schema-by-type.md)