Individual skill
currency-formatting
Use when reviewing utility functions, component props, or template strings that format numbers, prices, or dates to check whether Intl APIs are used correctly.
skills/currency-formatting/SKILL.md
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- frontend Repository topic
- front-end-development Repository topic
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SKILL.mdcore · 2,372 bytesreferences/rule.mddoc · 6,688 bytes
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# Use Intl APIs for currency, number, and date formatting
Number and currency formatting rules differ significantly across locales — a value formatted as "$1,234.56" in the US is written "1.234,56 $" in Germany and "¥1,235" in Japan. Hardcoded formatting causes incorrect display for international users and is expensive to maintain manually as you add locales.
## Quick Reference
- Never hardcode currency symbols or thousand separators like $ or comma
- Use Intl.NumberFormat with the currency style for monetary values
- Use Intl.DateTimeFormat for locale-aware date and time display
- Pass the user locale explicitly rather than relying on the browser default
- Use Intl.Collator and locale fallback chains for sorting and searching
## Check
