# clj-commons/aleph

Asynchronous streaming communication for Clojure - web server, web client, and raw TCP/UDP

Repository: https://github.com/clj-commons/aleph
Canonical: https://ross.abutalabs.com/products/aleph
Homepage: http://aleph.io
Language: Clojure
License: MIT
License Family: permissive
Topics: http, tcp, clojure, websockets, http-client, web-server, udp
Last push: 2026-08-24T08:52:28+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 5901, "days_push": 9, "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 2590, forks 241 (observed 2026-08-28T04:07:02.940394+00:00)

## What it is
Aleph is a Clojure library for asynchronous network communication built on Netty, providing an HTTP server and client plus raw TCP and UDP support. It exposes network data as Manifold streams that interoperate with core.async, Java InputStreams, and Clojure sequences.

## Use cases
- build an async HTTP server in Clojure
- make non-blocking HTTP client requests
- serve server-sent events with streamed responses
- run a Ring-compliant web server with async handlers
- stream data over raw TCP or UDP sockets
- support HTTP/2 with SSL in Clojure services
- bridge Netty performance with idiomatic Clojure streams

## When to choose
- you need asynchronous or streaming HTTP in a Clojure application
- you want a drop-in Ring server with async handler support
- you need low-level TCP/UDP access with a unified stream abstraction
- you want Netty's performance without writing Java

## When to avoid
- you need a simple synchronous HTTP server and don't care about async
- your project is not on the JVM
- you rely heavily on synchronous Ring middleware that doesn't work with deferred responses

## Facets
- artifact type: library
- maturity: active
- function: http-server, http-client, websocket, streaming, middleware
- domain: web-development, backend, networking, apis
- platform: jvm, jvm-scripting
- tags: clojure, netty, manifold, ring, tcp, udp, asynchronous, reactive-streams

## Member repositories
- clj-commons/aleph (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:02.940394+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 2026-08-30T02:22:19.847597+00:00, confidence not recorded.
  - readme: https://github.com/clj-commons/aleph (fetched 2026-08-28T04:07:02.940394+00:00, sha b50933b99e12)
  - homepage: http://aleph.io (fetched 2026-08-29T10:04:32.323693+00:00, sha dac2e6825595)
- Data as of 2026-08-30T08:39:29.467469+00:00.