# FormatNumberOptions

## Properties

### fallback?

> `optional` **fallback?**: `string`

Returned for null, undefined, or NaN inputs. Defaults to '—'.

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### fractionDigits?

> `optional` **fractionDigits?**: `number`

Fixed decimal precision — sets both min and max. Takes precedence over the pair below.

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### locale?

> `optional` **locale?**: `string`

BCP 47 locale string (e.g. 'en-US', 'pt-BR', or bare 'en'/'pt'). Defaults to 'en-US'.

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### maximumFractionDigits?

> `optional` **maximumFractionDigits?**: `number`

Maximum fraction digits (ignored if fractionDigits is set).

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### minimumFractionDigits?

> `optional` **minimumFractionDigits?**: `number`

Minimum fraction digits (ignored if fractionDigits is set).

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### suffix?

> `optional` **suffix?**: `string`

String appended after the number, separated by a space (e.g. 'm', 'ft', 'm³').