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Pkl

Developer tools ยท pkl-lang.org

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Pkl is a configuration-as-code language with validation and tooling, used from a command line, as a library or as a build plugin. Developers and platform engineers write configuration once and generate JSON, YAML, Property Lists and other formats, or embed it in Java, Kotlin, Swift and Go applications.

Facts at a glance

FactValueSource
Free planFree: a free plan existspkl-lang.org/main/current/pkl-cli/index.html, checked 5 Nov 2026
PlatformsmacOS, Linux, Windowspkl-lang.org/main/current/pkl-cli/index.html, checked 5 Nov 2026

Pricing & plans

Model

Free

Free plan available

  • Native Windows executable is built for amd64 only

  • Native macOS executable is built for amd64

  • Java executable is tested with Java 17 and 21

Source: pkl-lang.org/main/current/pkl-cli/index.html, checked 5 Nov 2026

Features & platforms

  • Static configuration output as JSON, YAML and Property Lists

  • Generated classes for Java, Kotlin, Swift and Go apps

  • Embedding in applications for runtime configuration

  • Data templating and validation

  • Editor support for IntelliJ, Neovim and VS Code

  • Command line tool with an interactive REPL

  • macOS
  • Linux
  • Windows

Sources: pkl-lang.org, pkl-lang.org/main/current/index.html, pkl-lang.org/main/current/pkl-cli/index.html, checked 5 Nov 2026

Alternatives

  • CUE

    Open source language that validates data, writes schemas and generates code, Protobuf definitions and OpenAPI definitions.

    cuelang.org

  • Jsonnet

    Licensed as open source under Apache 2.0, it extends JSON with object-orientation and functions to generate JSON, YAML and INI.

    jsonnet.org

  • Dhall

    Typed configuration language described as JSON plus functions, types and imports, with packages for Kubernetes and Docker.

    dhall-lang.org

Sources: cuelang.org, jsonnet.org, dhall-lang.org

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