voluptasmollitia/docs-exp/messaging.messagepayload.data.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/messaging](./messaging.md) &gt; [MessagePayload](./messaging.messagepayload.md) &gt; [data](./messaging.messagepayload.data.md)

## MessagePayload.data property

Arbitrary key/value payload.

<b>Signature:</b>

```typescript
data?: {
        [key: string]: string;
    };
```