convnum

ConvNum: TypeScript/JavaScript Utility Library for Converting Between Number Representations and Numeral Systems

A comprehensive TypeScript utility library for converting between various number representations, numeral systems, date/time formats, and more. Includes validation and type detection capabilities.

Installation

npm install convnum

Usage

import { toEnglishWords, fromChineseWords } from 'convnum'

console.log(toEnglishWords(12345)) // 'twelve thousand three hundred forty-five'
console.log(fromChineseWords('一万二千三百四十五')) // 12345

Detailed documentation is available at https://convnum.tomchen.org.

Supported Types

The library supports conversion and detection of the following number representation types:

(NumType is a type used in this library to identify different number representations)

Name	NumType	Examples	Notes
Decimal	decimal	"123", "456"	Standard base-10 numbers
Latin letters	latin_letter	"A", "b", "Z"	Standard Latin alphabet
Month	month_name	"January", "JAN", "february", "Feb"	Month names in various languages supported for conversion via Intl. Only English is supported for detection
Day of week	day_of_week	"Monday", "MON", "tuesday", "Tue"	Day names in various languages supported for conversion via Intl. Only English is supported for detection
Roman numerals	roman	"VI", "vi", "MMMCMXCIX"	Roman numeral system (range: 1-3999). Does not support single Unicode character form like "Ⅵ"
Arabic numerals	arabic	"٠", "١", "٢"	Eastern Arabic numerals
English cardinal	english_cardinal	"1st", "2Nd", "3RD"	Ordinal numbers with suffixes
English words	english_words	"one hundred twenty-three", "thReE"	Written English numbers
French words	french_words	"cent vingt-trois", "TroIs"	Written French numbers (currently supports traditional writing like "cent vingt-trois", not "cent-vingt-trois")
Chinese words	chinese_words	"一万三千零二", "一萬三千零二"	Standard Chinese numerals (simplified and traditional Chinese)
Chinese financial	chinese_financial	"壹万叁仟零贰", "壹萬叄仟零貳"	Traditional financial characters (simplified and traditional Chinese)
Binary	binary	"1010", "0B1101"	Base-2 numbers (0-1 only)
Octal	octal	"123", "0o456"	Base-8 numbers (0-7 only)
Hexadecimal	hexadecimal	"1A", "abc", "0xFF"	Base-16 numbers (0-9, A-F)
Greek letters	greek_letter	"Α", "α", "Ω"	Greek alphabet
Greek letter names	greek_letter_english_name	"Alpha", "BETA", "gamma"	English names of Greek letters (Alpha, Beta, Gamma, etc.)
Cyrillic letters	cyrillic_letter	"А", "а", "Я"	Cyrillic alphabet
Hebrew letters	hebrew_letter	"א", "ב", "ת"	Hebrew alphabet (22 standard letters, no upper/lower case distinction; no Final Forms)
Chinese Heavenly Stems	chinese_heavenly_stem	"甲", "乙", "丙"	天干 (Tiān Gān) (always same character in simplified and traditional Chinese)
Chinese Earthly Branches	chinese_earthly_branch	"子", "丑", "寅"	地支 (Dì Zhī) (always same character in simplified and traditional Chinese)
Chinese Solar Terms	chinese_solar_term	"立春", "惊蛰", "驚蟄"	节气 (Jié Qì) (simplified and traditional Chinese)
Astrological signs	astrological_sign	"Aries", "tauRuS"	Zodiac signs
NATO phonetic	nato_phonetic	"Alfa", "alpha", "braVo", "Charlie"	NATO phonetic alphabet

Special types:

Name	NumType	Examples	Notes
Invalid	invalid	null, undefined	Any non-string inputs (type errors)
Empty	empty	"", " "	Empty or whitespace-only strings
Unknown	unknown	"xyz", "!@#$"	Non-empty strings that don't match any type

Note:

• Julian day is supported only for conversion, not for detection, and is therefore not included in the NumType type.
• parseDateString and formatDateString are date functions, not number representations and not included in the NumType type. The two functions are used for precise parsing and formatting of date strings.

Features

• Conversion, validation, and detection functions for all supported types
• Robust error handling for invalid or unexpected inputs
• Thorough test coverage, including edge cases and uncommon scenarios
• Full support for:
  • Zero, negative values, large numbers (up to quintillions), and other edge cases
  • Multiple locales and number formats
  • Simplified ⇄ Traditional Chinese conversion (limited to characters used in this library)
  • Case-insensitive input across all functions
  • Zero runtime dependencies
  • Tree-shakable builds (when using specific functions — not the all-in-one version — with ES modules and a proper bundler)

Release Notes

0.1.0

• Initial release

0.2.0

• Date functions
• Detailed typeInfo
• Base prefix (e.g. "0x01", "0b01", "0o01")
• Circular support

0.2.1

• Simplify ParseDateResult interface

0.2.3

• Out-of-range circular support for all types in convertTo
• Export version

0.2.4

• Add year-month only support (months property to DateInterpretation and formatMonthString function)

0.2.5

• parseDateString correctly returns all possible DateInterpretation
• Fix nonexistent YDM
• Add non-year-month support (days property to DateInterpretation and formatDayString function)
• Traditional Chinese support
• getTypes and parseDateString's result ordering and compare functions

0.2.6

• Add Greek letter English name and Hebrew letter support

To-do

• Add 0-padding info to TypeInfo
• Loose matching for French and English words
• Maybe not in this lib: braille and morse code support

License

MIT