# auth_descriptor_by_id · FT4 Rell API · Chromia Docs (concept)

> function auth_ descriptor_ by_ id(account: account , id: byte_ array): account_ auth_ descriptor Finds an auth descriptor based on its ID and the account i

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.accounts/auth_descriptor_by_id/

FUNCTION

# auth\_descriptor\_by\_id

```signature
function auth_descriptor_by_id(account: account, id: byte_array): account_auth_descriptor
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/accounts/module.rell#lines-543)

Finds an auth descriptor based on its ID and the account it belongs to.

Throws `"MISSING AUTH DESCRIPTOR"` if none is found.

**Parameters**

* **account** — the account it belongs to
* **id** — the ID of the auth descriptor

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-rell/-f-t4%20-library/lib.ft4.core.accounts/auth_descriptor_by_id.html)Generated API reference, mirrored from the live docs