JsIndexNum

Index number calculations in the browser — the JavaScript/TypeScript port of PyIndexNum

13 index number methods

Bilateral (Jevons, Carli, Dutot, Laspeyres, Paasche, Fisher, Törnqvist, Walsh) and multilateral (GEKS-Fisher, GEKS-Törnqvist, GEKS-Jevons, Geary-Khamis, Time Product Dummy).

TypedArrays all the way down

A dependency-free columnar core — dictionary-encoded product ids, epoch-day periods, Float64Array prices and quantities — portable to Node and the browser.

Verified against Python

Every value is tested against the Python PyIndexNum pipeline (and the R PriceIndices / IndexNumR gold standards) under a documented 8-significant-digit convention.

DuckDB-WASM ingestion

The online calculator parses CSV, TSV, JSON, Parquet and Excel entirely in your browser — no uploads, no server.