API Reference > imodeljs-frontend > QuantityFormatting > FormatterParserSpecsProvider FormatterParserSpecsProvider Interface Beta Interface that defines the functions required to be implemented to provide custom formatting and parsing of a custom quantity type. Methods Name Description createFormatterSpec(unitSystem: UnitSystemKey): Promise<FormatterSpec> createParserSpec(unitSystem: UnitSystemKey): Promise<ParserSpec> Properties Name Type Description quantityType QuantityTypeArg Defined in core/frontend/src/quantity-formatting/QuantityFormatter.ts Line 233 Last Updated: 29 November, 2022