---
title: SearchQueryMatchKeyNullExpressionInput input | Wartiva API
description: A test for whether a key has any value: the input mirror of SearchQueryMatchKeyNullExpression. Valid for every field type.
url: https://wartiva.com/api-docs/types/search-query-match-key-null-expression-input.html
updated: 2026-10-07
---

Graph search · GraphQL input

# `SearchQueryMatchKeyNullExpressionInput` input

A test for whether a key has any value: the input mirror of [SearchQueryMatchKeyNullExpression](https://wartiva.com/api-docs/types/search-query-match-key-null-expression.html). Valid for every field type.

## Fields

| Input Field | Description |
|---|---|
| `key` - [`String!`](https://wartiva.com/api-docs/types/string.html) | The dot-notation key naming the object type and field whose presence is tested. |
| `operator` - [`SearchMatchValueOperator!`](https://wartiva.com/api-docs/types/search-match-value-operator.html) | The comparison operator: EQ tests "is null", NE tests "is not null". |

## Used by

- [`SearchQueryExpressionInput`](https://wartiva.com/api-docs/types/search-query-expression-input.html) input: A structured where clause: the input mirror of SearchQueryExpression, for callers that build a query as a data structure instead of writing the…

## Example

### Example

```json
{"key": "xyz789", "operator": "EQ"}

```

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