---
title: everyItem
description: Creates an every item validation action.
source: /actions/everyItem/everyItem.ts
contributors:
  - fabian-hiller
---

import { ApiList, Property } from '~/components';
import { properties } from './properties';

# everyItem

Creates an every item validation action.

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

## Generics

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

## Parameters

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

### Explanation

With `everyItem` you can freely validate the items of an array and return `true` if they are valid or `false` otherwise. If not every item matches your `requirement`, you can use `message` to customize the error message.

## Returns

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

## Examples

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

### Sorted array schema

Schema to validate that an array is sorted.

```ts
const SortedArraySchema = v.pipe(
  v.array(v.number()),
  v.everyItem(
    (item, index, array) => index === 0 || item >= array[index - 1],
    'The numbers must be sorted in ascending order.'
  )
);
```

## Related

The following APIs can be combined with `everyItem`.

### Schemas

<ApiList items={['any', 'array', 'custom', 'instance', 'tuple', 'unknown']} />

### Methods

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

### Utils

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