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# isArray

> Reference for the isArray workflow task, which checks whether an input is an array and returns true or false.

The `isArray` task checks if an input is an array and returns a boolean (`true` or `false`) indicating whether the input was validated as an array.

## Potential use case

Use the `isArray` task when you need to validate whether a dataset is an array. It is commonly used after a task that does not have a constant outgoing variable type — for example, an external API request that could return either an array or a string.

## Properties

| Incoming | Type  | Description                   |
| -------- | ----- | ----------------------------- |
| `arr`    | Array | Required. The input to check. |

| Outgoing    | Type    | Description                                                      |
| ----------- | ------- | ---------------------------------------------------------------- |
| `isAnArray` | Boolean | Returns `true` if the input is an array; returns `false` if not. |

## Examples

### Example 1

The `arr` variable is statically set to `["1","2","3"]`.

![](/_fern-img/6a535cb68db3902107589a46eda278281af5f7e2ca1b9f4adbeefecca40b3577.webp)

The outgoing result is `true`, indicating the input is an array.

![](/_fern-img/a674ee4458e3ba454bcdb43f30d87255e851281f87df998c9bd5f4b3ba0d8a83.webp)

### Example 2

The `arr` variable is set to `"1","2","3"` — notice the square brackets `[]` are missing from the beginning and end of the value.

![](/_fern-img/82237d96bd973095670172629175e3ab44477a0c240a658c8f147b4799fae38e.webp)

The task returns `false`, indicating the input is not an array.

![](/_fern-img/0b1bcdb33ad27089f45799b1ffbb6f351848e607a3814d26654dcdb25224a5e3.webp)

> Reference for the isArray workflow task, which checks whether an input is an array and returns true or false.