# hash

Creates a [hash](https://en.wikipedia.org/wiki/Hash_function) validation action.

```ts
const Action = v.hash<TInput, TMessage>(message);
```

## Generics

- `TInput` <Property {...properties.TInput} />
- `TMessage` <Property {...properties.TMessage} />

## Parameters

- `types` <Property {...properties.types} />
- `message` <Property {...properties.message} />

### Explanation

With `hash` you can validate the formatting of a string. If the input is not a hash, you can use `message` to customize the error message.

## Returns

- `Action` <Property {...properties.Action} />

## Examples

The following examples show how `hash` can be used.

### Hash schema

Schema to validate a hash.

```ts
const HashSchema = v.pipe(
  v.string(),
  v.hash(['md5', 'sha1'], 'The specified hash is invalid.')
);
```

## Related

The following APIs can be combined with `hash`.

### Schemas

<ApiList items={['any', 'custom', 'string']} />

### Methods

<ApiList items={['pipe']} />

### Utils

<ApiList items={['isOfKind', 'isOfType']} />