---
title: useOnChildChangedQuery
---

Subscribe to `child_changed` events on a Realtime Database query.

## Usage

```tsx
import { ref } from "firebase/database";
import { useOnChildChangedQuery } from "@tanstack-query-firebase/react/database";

const messagesRef = ref(database, "messages");
const { data: snapshot } = useOnChildChangedQuery(messagesRef, {
  queryKey: ["database", "childChanged", "messages"],
});
```