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# Object.isSealed()

The **`Object.isSealed()`** method determines if an object is
sealed.

## Syntax

```js
Object.isSealed(obj)
```

### Parameters

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

### Return value

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

## Description

Returns `true` if the object is sealed, otherwise `false`. An
object is sealed if it is not [extensible](../../globals/Object/isExtensible.mdx) and
if all its properties are non-configurable and therefore not removable (but not
necessarily non-writable).
