modular‑scale is a tiny Node.js library that calculates typographic or layout “modular scales” using a base size and a mathematical ratio (e.g., golden section, perfect fifth). It supplies functions to retrieve a specific step, generate an array of steps, and return values either as raw pixels or as relative rem/em units—making it useful for designers and front‑end developers who want programmatic, responsive sizing for fonts, spacing, or other UI dimensions.