---
category: '@Firebase'
---

# useRTDB

Reactive [Firebase Realtime Database](https://firebase.google.com/docs/database) binding. Making it straightforward to **always keep your local data in sync** with remotes databases.

## Usage

```ts
import { useRTDB } from '@vueuse/firebase/useRTDB';
import { initializeApp } from 'firebase/app';
import { getDatabase } from 'firebase/database';

const app = initializeApp({
  /* config */
});
const db = getDatabase(app);

// in setup()
const todos = useRTDB(db.ref('todos'));
```

You can reuse the db reference by passing `autoDispose: false`

```ts
const todos = useRTDB(db.ref('todos'), { autoDispose: false });
```

or use `createGlobalState` from the core package

```ts twoslash include store
// @filename: store.ts
// ---cut---
// store.ts
import { createGlobalState } from '@vueuse/core';
import { useRTDB } from '@vueuse/firebase/useRTDB';

export const useTodos = createGlobalState(() => useRTDB(db.ref('todos')));
```

```vue
<!-- app.vue -->
<script setup lang="ts">
// @include: store
// ---cut---
import { useTodos } from './store';

const todos = useTodos();
</script>
```

## Type Declarations

```ts
export interface UseRTDBOptions {
  errorHandler?: (err: Error) => void;
  autoDispose?: boolean;
}
/**
 * Reactive Firebase Realtime Database binding.
 *
 * @see https://vueuse.org/useRTDB
 */
export declare function useRTDB<T = any>(
  docRef: DatabaseReference,
  options?: UseRTDBOptions,
): Ref<T | undefined, T | undefined>;
```
