# LabelContext reference

Helpers passed to label functions, such as locale-aware number formatting, so custom labels follow the viewer's `locale`.

## Used by

- [Labels and locale](https://react-pdf-viewer-chi.vercel.app/react-pdf-viewer/labels.md)

## Import

```ts
import type { LabelContext } from '@kingtech/react-pdf-viewer';
```

## Properties

| Name | Type | Default | Required | Description |
| --- | --- | --- | --- | --- |
| `formatNumber` | `(value: number) => string` | — | Yes | Formats an integer for the viewer's `locale` (no grouping separators). |

## Source

[packages/react-pdf-viewer/src/labels.ts](https://github.com/kiralygyula92/react-pdf-viewer/blob/main/packages/react-pdf-viewer/src/labels.ts#L4)