# ReactiveX/rxjs

A reactive programming library for JavaScript

Repository: https://github.com/ReactiveX/rxjs
Canonical: https://ross.abutalabs.com/products/rxjs
Homepage: https://rxjs.dev
Language: TypeScript
License: Apache-2.0
License Family: permissive
Topics: rxjs, javascript
Last push: 2026-08-08T23:15:21+00:00

## Health v2 (maintenance only)
Score: 84/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 96, release rhythm 60, longevity 100
- inputs: {"age_days": 4189, "days_push": 25, "days_rel": 29, "gap_med": null, "n_releases_24m": 1}
- flags: prerelease_only
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 31701, forks 2991 (observed 2026-08-28T04:11:57.021275+00:00)

## What it is
RxJS is a reactive programming library for composing asynchronous and event-based programs using Observables. This repository hosts the next-generation RxJS 9, which leverages the native web-platform Observable with a conforming fallback.

## Use cases
- compose async event streams in JavaScript
- handle user input events reactively
- manage complex async data flows in Angular apps
- debounce and throttle event handling
- cancel and retry async operations declaratively

## When to choose
- you need composable, cancellable async/event pipelines
- you're building Angular apps where RxJS is idiomatic
- you want a mature, battle-tested reactive library with a huge ecosystem

## When to avoid
- your app has only simple promise-based async flows
- you want minimal bundle size and no learning curve
- your team is unfamiliar with reactive programming concepts

## Facets
- artifact type: library
- maturity: active
- function: state-management, concurrency, streaming
- domain: web-development, frontend
- platform: browser, cross-platform
- tags: reactive-programming, observables, event-streams, typescript, rxjs, javascript, nodejs

## Member repositories
- ReactiveX/rxjs (main) score 84

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:57.021275+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 2026-08-29T16:52:15.284759+00:00, confidence not recorded.
  - readme: https://github.com/ReactiveX/rxjs (fetched 2026-08-28T04:11:57.021275+00:00, sha 88392691f81a)
  - homepage: https://rxjs.dev (fetched 2026-08-29T07:49:31.210561+00:00, sha d33ffb4a1a52)
- Data as of 2026-08-30T08:39:29.467469+00:00.