Roman Numeral Converter

Use this endpoint when you need a quick, reliable bidirectional conversion between integers and canonical Roman numerals — ideal for formatting years, numbering systems in design, decoding historical inscriptions, or puzzle/game logic. Prefer it over manual lookup or general LLM-based conversion when you need guaranteed canonical form.

• Integer out of valid Roman numeral range (typically 1–3999) returns an error
• Invalid Roman numeral string input causes a parsing error
• Missing required 'value' query parameter returns a bad request error
• Non-numeric string passed when integer expected returns a validation error