# monet/monet.js

monet.js - Monadic types library for JavaScript

Repository: https://github.com/monet/monet.js
Canonical: https://ross.abutalabs.com/products/monetjs
Homepage: https://monet.github.io/monet.js/
Language: JavaScript
License: MIT
License Family: permissive
Last push: 2022-11-19T03:11:17+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4711, "days_push": 1383, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1593, forks 111 (observed 2026-08-28T04:05:08.878843+00:00)

## What it is
Monet.js is a JavaScript library providing a rich set of monadic types and functional programming abstractions such as Maybe, Either, Validation, and immutable lists. It helps developers write safer, more declarative code by avoiding nulls and exceptions through pure functional patterns.

## Use cases
- avoid null pointer errors with Maybe
- handle errors without exceptions using Either
- accumulate validation errors in forms
- use immutable lists in JavaScript
- write functional-style JavaScript code
- chain computations with flatMap and map

## When to choose
- you want monadic error handling and null-safety in JavaScript or TypeScript
- you prefer functional programming patterns like Maybe and Either
- you need error-accumulating Validation for form or data validation

## When to avoid
- you want a full functional programming ecosystem like fp-ts or Ramda
- your team is unfamiliar with monads and functional concepts
- you need a library with frequent updates and active development

## Facets
- artifact type: library
- maturity: maintenance
- function: error-handling, serialization
- domain: web-development, frontend, developer-tools, programming-languages
- platform: browser, cross-platform
- tags: functional-programming, monads, maybe, either, validation, immutable-collections, typescript-friendly, nodejs, javascript

## Member repositories
- monet/monet.js (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:08.878843+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:54:15.277616+00:00, confidence not recorded.
  - readme: https://github.com/monet/monet.js (fetched 2026-08-28T04:05:08.878843+00:00, sha 8642a477b0f8)
  - homepage: https://monet.github.io/monet.js/ (fetched 2026-08-29T11:25:23.229931+00:00, sha 837be068036f)
- Data as of 2026-08-30T08:39:29.467469+00:00.