lightbend/config

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

6313 stars · 980 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

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

library · maturity stable

configuration-management parser serialization developer-tools backend jvm cross-platform hocon config-files typesafe-config java-properties json-superset jvm

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