# isNull

```ts
function isNull<T>(value): WithAggregate<BasicExpression<boolean>, T>;
```

Defined in: [packages/db/src/query/builder/functions.ts:318](https://github.com/TanStack/db/blob/main/packages/db/src/query/builder/functions.ts#L318)

## Type Parameters

### T

`T` *extends* `ExpressionLike`

## Parameters

### value

`T`

## Returns

`WithAggregate`\<[`BasicExpression`](../@tanstack/namespaces/IR/type-aliases/BasicExpression.md)\<`boolean`\>, `T`\>