# fukamachi/clack

Web server abstraction layer for Common Lisp

Repository: https://github.com/fukamachi/clack
Canonical: https://ross.abutalabs.com/products/fukamachi-clack
Language: Common Lisp
License: MIT
License Family: permissive
Topics: common-lisp, web
Last push: 2026-02-10T20:49:31+00:00

## Health v2 (maintenance only)
Score: 62/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 66, release rhythm 35, longevity 100
- inputs: {"age_days": 5712, "days_push": 204, "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 1109, forks 89 (observed 2026-08-28T04:03:37.275043+00:00)

## What it is
Clack is a web application environment for Common Lisp that provides a server abstraction layer inspired by Python's WSGI and Ruby's Rack. It lets applications run on interchangeable backends like Hunchentoot, Woo, Wookie, and Toot, and includes a clackup CLI for deployment.

## Use cases
- build a web app in Common Lisp
- run a Common Lisp web server behind a portable abstraction
- swap web server backends without changing app code
- deploy a Lisp web app with a command-line launcher
- write middleware-based Lisp web applications with Lack
- serve a simple HTTP endpoint from a Lisp lambda

## When to choose
- you're writing a Common Lisp web application and want server portability
- you want a Rack/WSGI-style handler interface in Lisp
- you need a simple CLI to start and stop Lisp web servers in production

## When to avoid
- you're not using Common Lisp
- you need a full-featured batteries-included web framework rather than an abstraction layer
- your stack is already tied to a single server like raw Hunchentoot

## Facets
- artifact type: library
- maturity: stable
- function: http-server, web-framework, middleware, routing, cli
- domain: web-development, backend, developer-tools
- platform: cross-platform, cli
- tags: common-lisp, wsgi, rack, web-server-abstraction, lack, hunchentoot, quicklisp, web-server

## Member repositories
- fukamachi/clack (main) score 62

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:37.275043+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 2026-08-30T06:43:34.781588+00:00, confidence not recorded.
  - readme: https://github.com/fukamachi/clack (fetched 2026-08-28T04:03:37.275043+00:00, sha 7f73013a7634)
- Data as of 2026-08-30T08:39:29.467469+00:00.