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[`App`](App) › [`saveLocalStorage`](App/saveLocalStorage)
## App.saveLocalStorage() method
Save vault-specific value to `localStorage`<!-- -->. If data is `null`<!-- -->, the entry will be cleared.
**Signature:**
```typescript
saveLocalStorage(key: string, data: unknown | null): void;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| <code>key</code> | <code>string</code> | |
| <code>data</code> | <code>unknown | null</code> | <p>value being saved to localStorage. Must be serializable.</p><p> 1.8.7</p> |
**Returns:**
`void`