apple/pkl

Health v2 · maintenance only

Flags: no_readme

Adoption not part of the score

11497 stars · 399 forks observed · 2026-08-28

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

Pkl is a configuration-as-code language from Apple with rich validation, templating, and tooling for defining programmable, scalable, and safe configuration. It ships a CLI with a REPL, generates JSON, YAML, property lists, and static config formats, and offers bindings for Java, Kotlin, Swift, and Go.

Use cases

• generate json yaml plist from a single config source
• validate application configuration with type checks
• manage kubernetes configuration as typed templates
• embed a config language into jvm or swift applications
• replace jsonnet or yaml for complex config
• generate typed config classes for java kotlin swift go

When to choose

• you need programmable, validated configuration beyond what yaml or toml offers
• you must emit multiple config formats from one source of truth
• you want type-safe config bindings for jvm, swift, or go apps
• you manage kubernetes or CI configs that benefit from templates and validation

When to avoid

• your configuration is simple and flat where yaml or env files suffice
• your team cannot adopt a new language for config
• you need a widely adopted standard with a large ecosystem
• you only need runtime config without code generation or validation

Facets

cli-tool · maturity active

configuration-management serialization form-handling cli programming-language developer-tools programming-languages windows jvm cli cross-platform config-as-code configuration-language json-yaml-plist kubernetes-config spring-boot code-generation type-safe-config configuration devops macos linux

Member repositories

For agents

markdown · JSON · MCP: product_card(name="apple/pkl")