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# Object.isFrozen()

The **`Object.isFrozen()`** determines if an object is
[frozen](../../globals/Object/freeze.mdx).

## Syntax

```js
Object.isFrozen(obj)
```

### Parameters

- `obj`
  - : The object which should be checked.

### Return value

A `Boolean` indicating whether or not the given object is frozen.

## Description

An object is frozen if and only if it is not [extensible](../../globals/Object/isExtensible.mdx), all its properties are non-configurable, and all its data
properties (that is, properties which are not accessor properties with getter or setter
components) are non-writable.
