ssn-formatter

A lightweight JavaScript library for parsing, formatting, and masking US Social Security Numbers. Current stable version is 1.0.0, released with no subsequent updates. It provides a simple API via `SSNFormatter.parse()` returning an object with area, group, and serial parts, and a `format()` method supporting customizable masks. Key differentiators include minimal dependencies and straightforward pattern-based parsing using characters A-I for SSN digits. However, it lacks TypeScript types, is not actively maintained, and has no built-in validation for invalid SSNs like 000 or 666 prefixes.