voluptasmollitia/docs-exp/storage.settablemetadata.custommetadata.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/storage](./storage.md) &gt; [SettableMetadata](./storage.settablemetadata.md) &gt; [customMetadata](./storage.settablemetadata.custommetadata.md)

## SettableMetadata.customMetadata property

Additional user-defined custom metadata.

<b>Signature:</b>

```typescript
customMetadata?: {
        [key: string]: string;
    } | undefined;
```