# Update the formula by its ID

**`PUT /api/v1/formulas/{formulaId}`**

Updates the configuration of an existing formula for the specified formula ID.

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

**Permission:** `Permissions.FORMULAS_FORMULA_CREATE`

***

## Request

### Path Parameters

| Parameter   | Type   | Required | Description                          |
| ----------- | ------ | -------- | ------------------------------------ |
| `formulaId` | string | Yes      | Database ID of the formula to update |

### Request Body

```json
{
  "name": "Updated Carbon Credit Calculator",
  "description": "Updated description",
  "policyId": "63e3e5e8a01b3c001234abcd",
  "config": {}
}
```

| Field         | Type   | Required | Description                                |
| ------------- | ------ | -------- | ------------------------------------------ |
| `name`        | string | No       | Human-readable formula name                |
| `description` | string | No       | Description of the formula's purpose       |
| `policyId`    | string | No       | ID of the policy this formula is linked to |
| `config`      | object | No       | Updated formula expression configuration   |

***

## Response

### Success Response

**Status:** `200 OK`

```json
{
  "id": "63e3e5e8a01b3c001234abcd",
  "uuid": "c4a3b2d1-e5f6-7890-abcd-ef1234567890",
  "name": "Updated Carbon Credit Calculator",
  "description": "Updated description",
  "status": "DRAFT",
  "owner": "did:hedera:testnet:zHcDLGFNymFAJiMBKnpbHDgjvTn6yZnwkPPeFhtJBECH_0.0.4532001",
  "policyId": "63e3e5e8a01b3c001234abcd",
  "config": {}
}
```

### Error Responses

| Status                      | Description                               |
| --------------------------- | ----------------------------------------- |
| `401 Unauthorized`          | Missing or invalid token                  |
| `403 Forbidden`             | Insufficient permissions                  |
| `404 Not Found`             | Formula with the given ID does not exist  |
| `422 Unprocessable Entity`  | `formulaId` parameter is missing or empty |
| `500 Internal Server Error` | Unexpected server failure                 |


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://guardian.hedera.com/docs/develop/guardian/standard-registry/policies/formula-linked-definitions/apis-related-to-formula-linked/update-the-formula-by-its-id.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.