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Monorepo for the Firebase JavaScript SDK
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Markdown
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[Home](./index.md) > [@firebase/messaging](./messaging.md) > [MessagePayload](./messaging.messagepayload.md) > [collapseKey](./messaging.messagepayload.collapsekey.md)
## MessagePayload.collapseKey property
<b>Signature:</b>
```typescript
collapseKey: string;
```