# caolan/highland

High-level streams library for Node.js and the browser

Repository: https://github.com/caolan/highland
Canonical: https://ross.abutalabs.com/products/highland
Homepage: https://caolan.github.io/highland
Language: JavaScript
License: Apache-2.0
License Family: permissive
Last push: 2020-06-18T07:57:58+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5121, "days_push": 2267, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3430, forks 145 (observed 2026-08-28T04:08:04.031329+00:00)

## What it is
Highland is a high-level streams library for Node.js and the browser that unifies synchronous and asynchronous data sources behind a single stream abstraction. It provides functional-style transforms (map, filter, reduce) over values distributed in time, interoperating with Node streams, promises, callbacks, and event emitters.

## Use cases
- process async data with functional map/filter/reduce
- unify promises, callbacks, and event emitters into one stream API
- backpressure-aware streaming pipelines in Node.js
- transform Node.js streams with lodash-like utilities
- handle large files or event streams without loading everything into memory
- switch between sync and async data sources without rewriting code

## When to choose
- you want a functional utility belt for Node streams and async iteration
- you need to mix synchronous and asynchronous sources in one pipeline
- you want backpressure handling without manual plumbing
- you need browser and Node.js support in one library

## When to avoid
- you're starting a new project - consider modern async iterators or RxJS/observables
- you need actively maintained software with recent releases
- you only need simple promise-based async flows without streaming
- you need reactive features like time-based operators or subject semantics

## Facets
- artifact type: library
- maturity: maintenance
- function: streaming, concurrency, developer-tools
- domain: developer-tools, web-development
- platform: browser
- tags: streams, functional-programming, async, node-streams, transducers, real-time, nodejs, javascript

## Member repositories
- caolan/highland (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:04.031329+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 2026-08-29T18:37:47.241962+00:00, confidence not recorded.
  - readme: https://github.com/caolan/highland (fetched 2026-08-28T04:08:04.031329+00:00, sha 92c3c4123b23)
  - homepage: https://caolan.github.io/highland (fetched 2026-08-29T09:32:04.417052+00:00, sha 74ae93f4b09e)
  - registry_npm: https://registry.npmjs.org/highland (fetched 2026-08-29T09:32:04.428719+00:00, sha 991198eade01)
- Data as of 2026-08-30T08:39:29.467469+00:00.