How to handle 401 error?

Question

Angular

We need to handle this error in order to add an inscription under the form, indicating that incorrect data has been entered.

something like that

<mat-error *ngIf="passForm.hasError('required')">Необходимо указать пароль</mat-error>
<mat-error *ngIf="passForm.hasError('minlength')">Пароль должен быть более шести символов</mat-error>

I understand that I need to find out if there is such an error and if its status is 401, but I don’t understand how to do it