# lightbend/config

configuration library for JVM languages using HOCON files

Repository: https://github.com/lightbend/config
Canonical: https://ross.abutalabs.com/products/config
Homepage: https://lightbend.github.io/config/
Language: Java
License Family: other
Topics: supported, hocon, configuration-library
Last push: 2026-07-01T15:19:54+00:00

## Health v2 (maintenance only)
Score: 87/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 90, release rhythm 75, longevity 100
- inputs: {"age_days": 5384, "days_push": 63, "days_rel": 91, "gap_med": 62, "n_releases_24m": 6}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 6313, forks 980 (observed 2026-08-28T04:09:41.674211+00:00)

## What it is
Lightbend Config (formerly Typesafe Config) is a dependency-free Java library for loading application configuration in JVM languages. It supports HOCON (a human-friendly JSON superset), Java properties, and JSON, with merging, substitutions, and type conversion.

## Use cases
- load application.conf config files in a JVM app
- parse HOCON configuration files
- merge config from files, classpath, and system properties
- substitute environment variables in config
- parse duration and size settings like '10 seconds' or '512k'
- share config between an app and its libraries from one file

## When to choose
- you need zero-dependency config loading on the JVM
- you want HOCON's comments, includes, and substitutions
- you need layered config merging with defaults and overrides
- you want type coercion and duration/size parsing built in

## When to avoid
- you need to load config from a database or other custom source without writing glue code
- you want runtime-reloadable dynamic config or a config service
- you are not on a JVM platform

## Facets
- artifact type: library
- maturity: stable
- function: configuration-management, parser, serialization
- domain: developer-tools, backend
- platform: jvm, cross-platform
- tags: hocon, config-files, typesafe-config, java-properties, json-superset, jvm

## Member repositories
- lightbend/config (main) score 87

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:41.674211+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 2026-08-29T17:46:13.022156+00:00, confidence not recorded.
  - readme: https://github.com/lightbend/config (fetched 2026-08-28T04:09:41.674211+00:00, sha c2f837b1c731)
  - homepage: https://lightbend.github.io/config/ (fetched 2026-08-29T08:42:38.723100+00:00, sha 6c514454f34b)
- Data as of 2026-08-30T08:39:29.467469+00:00.