taoensso/timbre

Health v2 · maintenance only

Adoption not part of the score

1483 stars · 173 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

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

library · maturity maintenance

logging middleware developer-tools backend web-development cross-platform jvm clojure clojurescript slf4j appenders rate-limiting async-logging nodejs

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