zio/zio-json
zio/zio-json has 429 GitHub stars and 164 forks. Star changes are not measured yet. Last checked 2026-11-14 13:15 UTC. Last push 2026-11-13.
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About
Fast, secure JSON library with tight ZIO integration.
SecurityREADME.md
OriginalZIO Json is a fast and secure JSON library with tight ZIO integration.
Introduction
The goal of this project is to create the best all-round JSON library for Scala:
- Performance to handle more requests per second than the incumbents, i.e. reduced operational costs.
- Security to mitigate against adversarial JSON payloads that threaten the capacity of the server.
- Fast Compilation no shapeless, no type astronautics.
- Future-Proof, prepared for Scala 3 and next-generation Java.
- Simple small codebase, concise documentation that covers everything.
- Helpful errors are readable by humans and machines.
- ZIO Integration so nothing more is required.
Installation
In order to use this library, we need to add the following line in our build.sbt file:
libraryDependencies += "dev.zio" %% "zio-json" % "1.1.2"
For cross-platform projects with Scala.js and Scala Native need to replace %% operator by %%%,
and optionally when using java.time.ZoneId and java.time.ZonedDateTime types need to add
the dependency on the latest version of Timezone DB:
libraryDependencies += "io.github.cquiroz" %%% "scala-java-time-tzdb" % "latest.integration"
Continue with the Getting Started guide for a walkthrough of encoding and decoding JSON with ZIO JSON.
Documentation
Learn more on the ZIO JSON homepage!
Contributing
For the general guidelines, see ZIO contributor's guide.
Code of Conduct
See the Code of Conduct
Support
Acknowledgement
Uses JsonTestSuite to test parsing. (c) 2016 Nicolas Seriot)
Uses YourKit Java Profiler for performance optimisation.

License
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