Dinero.js Formatting

Patterns for formatting Dinero.js monetary values for display. Covers currency symbols, locale-aware formatting, non-decimal currencies, and serialization.

When to Apply

Reference these guidelines when:

• Displaying prices, totals, or monetary values in a UI
• Adding currency symbols or locale-specific formatting
• Formatting non-decimal currencies (e.g., historical currencies with non-base-10 subdivisions)
• Serializing Dinero objects for APIs, databases, or transport
• Building reusable formatting utilities

Rule Categories by Priority

Priority	Category	Impact	Prefix
1	Display	CRITICAL	display-
2	Locale	HIGH	locale-
3	Serialization	HIGH	serialization-
4	Non-Decimal	MEDIUM	nondecimal-

Quick Reference

1. Display (CRITICAL)

• display-to-decimal - Use toDecimal for display strings, not toSnapshot
• display-no-currency-symbols - Dinero.js does not format currency symbols; compose with Intl.NumberFormat

2. Locale (HIGH)

• locale-intl-formatter - Build reusable formatters with Intl.NumberFormat
• locale-multilingual - Create locale-parameterized formatters for multilingual sites

3. Serialization (HIGH)

• serialization-snapshot - Use toSnapshot for transport and storage, not display
• serialization-bigint-json - BigInt Dinero objects require a custom JSON replacer

4. Non-Decimal (MEDIUM)

• nondecimal-to-units - Use toUnits for non-decimal currencies, not toDecimal

How to Use

Read individual rule files for detailed explanations and code examples:

rules/display-no-currency-symbols.md
rules/locale-intl-formatter.md

Each rule file contains:

• Brief explanation of why it matters
• Incorrect code example with explanation
• Correct code example with explanation
• Additional context and references