docs/api/utils.md from reactjs/redux

docs/api/utils.md

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---
id: utils
title: Additional Utilities
hide_title: true
description: 'API > utils: Additional utility functions'
---

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# Utility Functions

The Redux core exports additional utility functions for reuse.

## `isAction`

Returns true if the parameter is a valid Redux action object (a plain object with a string `type` field).

This also serves as a TypeScript type predicate, which will narrow the TS type to `Action<string>`.

## `isPlainObject`

Returns true if the value appears to be a plain JS object.