Compare software

Pkl vs Jsonnet: catalog facts
Pkl	Jsonnet
Best for: Developers who want typed, validated configuration that outputs to common formats	Best for: Developers generating large, repetitive JSON or YAML configuration such as Kubernetes manifests
Free Free and open source under the Apache-2.0 license.	Free Free and open source under the Apache 2.0 licence.
Windows, Command line	Command line
Generates JSON, YAML, plist and properties files from one source Built-in validation constraints on values All 3 strengths for Pkl Generates JSON, YAML, plist and properties files from one source Built-in validation constraints on values Code generation for Java, Kotlin, Swift and Go	Removes duplication in config through functions and object inheritance Outputs JSON, YAML, INI and other formats All 4 strengths for Jsonnet Removes duplication in config through functions and object inheritance Outputs JSON, YAML, INI and other formats Formally specified, with a formatter and linter Editor and IDE integrations
A new language for a team to learn Adds a generation step to existing configuration workflows	Another language for a team to learn on top of JSON or YAML Mainly useful for large or repetitive configuration
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: Apache-2.0
No account needed	No account needed
Not stated if it works offline	Offline features available
Official website Full listing and sources Sources for Pkl pkl-lang.org Catalog checked October 2, 2026	Official website Full listing and sources Sources for Jsonnet jsonnet.org Catalog checked October 1, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.