# logfellow/logstash-logback-encoder

Logback JSON encoder and appenders

Repository: https://github.com/logfellow/logstash-logback-encoder
Canonical: https://ross.abutalabs.com/products/logstash-logback-encoder
Language: Java
License: Apache-2.0
License Family: permissive
Topics: logback, json, logstash, logback-appender
Last push: 2026-07-15T22:35:54+00:00

## Health v2 (maintenance only)
Score: 69/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 92, release rhythm 22, longevity 100
- inputs: {"age_days": 4930, "days_push": 49, "days_rel": 311, "gap_med": 204, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2529, forks 416 (observed 2026-08-28T04:06:58.768585+00:00)

## What it is
A Java library providing Logback encoders, layouts, and appenders for logging in JSON and other Jackson-supported formats. Originally built for Logstash-compatible output, it has evolved into a highly configurable general-purpose structured logging mechanism.

## Use cases
- output logback logs in JSON format for logstash ingestion
- configure structured logging for Java applications
- send logs over TCP or UDP to a central log collector
- customize which fields are included in JSON log events
- log HTTP access events in JSON via logback-access
- use async appenders with ring buffers for high-throughput logging

## When to choose
- you need JSON structured logging from a Java/JVM application using logback
- you ship logs to Logstash, Elasticsearch, or other JSON-based log pipelines
- you need fine-grained control over log event fields and output format

## When to avoid
- your application does not use logback as its logging framework
- you only need simple human-readable text logs
- you use a logging framework other than SLF4J/logback

## Facets
- artifact type: library
- maturity: active
- function: logging, serialization
- domain: developer-tools, backend
- platform: jvm
- tags: logback, logstash, -logging, structured-logging, jackson, appender, logging

## Member repositories
- logfellow/logstash-logback-encoder (main) score 69

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:58.768585+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 2026-08-30T02:25:22.126871+00:00, confidence not recorded.
  - readme: https://github.com/logfellow/logstash-logback-encoder (fetched 2026-08-28T04:06:58.768585+00:00, sha cfa7f614774f)
- Data as of 2026-08-30T08:39:29.467469+00:00.