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---
layout: api
id: aggregateerror
title: AggregateError
---


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##AggregateError

```js
new AggregateError() extends Array -> AggregateError
```


A collection of errors. `AggregateError` is an array-like object, with numeric indices and a `.length` property. It supports all generic array methods such as `.forEach` directly.

`AggregateError`s are caught in [`.error`](.) handlers, even if the contained errors are not operational.

[Promise.some](.) and [Promise.any](.)  use `AggregateError` as rejection reason when they fail.


Example:

```js
//Assumes AggregateError has been made global
var err = new AggregateError();
err.push(new Error("first error"));
err.push(new Error("second error"));
throw err;
```

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