# taoensso/timbre

Pure Clojure/Script logging library

Repository: https://github.com/taoensso/timbre
Canonical: https://ross.abutalabs.com/products/timbre
Homepage: https://www.taoensso.com/timbre
Language: Clojure
License: EPL-1.0
License Family: copyleft
Topics: clojure, clojurescript, epl, taoensso, logging, slf4j
Last push: 2025-11-06T16:27:48+00:00

## Health v2 (maintenance only)
Score: 54/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 50, release rhythm 32, longevity 100
- inputs: {"age_days": 5210, "days_push": 300, "days_rel": 377, "gap_med": 63, "n_releases_24m": 6}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1483, forks 173 (observed 2026-08-28T04:04:51.244251+00:00)

## What it is
Timbre is a pure Clojure/ClojureScript logging library that is fast, flexible, and configured with a single Clojure data map instead of XML or properties files. It supports custom appenders and middleware, level/namespace filtering, compile-time elision, rate limits, async logging, and optional interop with tools.logging and SLF4Jv2.

## Use cases
- add logging to a Clojure web app without Java logging XML config
- log from shared Clojure/ClojureScript code on both JVM and JavaScript
- send raw log arguments to a custom database via a custom appender
- filter log output by level and namespace with a simple config map
- rate-limit noisy log calls and log asynchronously
- bridge Clojure logging with existing SLF4J-based Java libraries

## When to choose
- you want simple, data-driven logging that works out of the box in Clojure or ClojureScript
- you need custom appenders or middleware as plain functions
- you want zero-overhead compile-time log elision
- you are maintaining an existing codebase already using Timbre

## When to avoid
- you are starting a new project - the author recommends Telemere, a modern rewrite
- you need deep integration with the Java logging ecosystem as a primary requirement
- you need logging in a non-Clojure language

## Facets
- artifact type: library
- maturity: maintenance
- function: logging, middleware
- domain: developer-tools, backend, web-development
- platform: cross-platform, jvm
- tags: clojure, clojurescript, slf4j, appenders, rate-limiting, async-logging, nodejs

## Member repositories
- taoensso/timbre (main) score 54

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:51.244251+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 2026-08-30T04:34:03.898801+00:00, confidence not recorded.
  - readme: https://github.com/taoensso/timbre (fetched 2026-08-28T04:04:51.244251+00:00, sha b654ca31fe33)
  - homepage: https://www.taoensso.com/timbre (fetched 2026-08-29T11:40:31.266746+00:00, sha f8ff190d2d50)
- Data as of 2026-08-30T08:39:29.467469+00:00.