Issues

• Decoder allocates 2.4x more than jsoniter-scala; 55% of it is removable without API changes

  zio/zio-json#1651 · Filter by author guizmaii opened on Jul 27, 2026
  1

  

• Using toJsonAST without fear of failure.

  zio/zio-json#1607 · Filter by author felix-hedenstrom opened on May 27, 2026

• Json.Obj.equals returns true for distinct objects with duplicate keys

  zio/zio-json#1600 · Filter by author haskiindahouse opened on May 10, 2026

• Error when reading json array file?

  zio/zio-json#1597 · Filter by author guizmaii opened on May 8, 2026
  1

• Avoid throwing errors when a fallback Decoder is bound

  zio/zio-json#1535 · Filter by author hearnadam opened on Jan 22, 2026

• Scala 3 case object derivation differs from Scala 2

  zio/zio-json#1482 · Filter by author hearnadam opened on Oct 20, 2025
  1

• Incorrect parsing of integer numbers at scientific form

  zio/zio-json#1405 · Filter by author sad-fat-cat opened on May 23, 2025
  2

• Scala 3 Derivation fails on evidence parameters

  zio/zio-json#1369 · Filter by author hearnadam opened on Mar 28, 2025

• ZioJson is 3x slower than jsoniter using a specific benchmark

  zio/zio-json#1368 · Filter by author mbaechler opened on Mar 26, 2025
  3

• jsonDiscriminator does not add field when encoding

  good first issue
  zio/zio-json#1197 · Filter by author funrep opened on Dec 16, 2024
  3

• Scala3: Deriving a JsonDecoder for a type having a phantom type doesn't seem to work

  derivation
  zio/zio-json#1178 · Filter by author jivanic-demystdata opened on Oct 17, 2024
  2

• Support Producing JSON Schema

  good first issue
  zio/zio-json#1170 · Filter by author hearnadam opened on Oct 7, 2024
  1

• Add ZIO SBT CI or Update CI Corresponding To ZIO Contribution Guide

  good first issue
  zio/zio-json#1118 · Filter by author khajavi opened on May 17, 2024

• Better ISO-8601 support

  zio/zio-json#1036 · Filter by author paulpdaniels opened on Oct 19, 2023
  1

• Automatic derivation of codecs fails for nested HKT if implicits are defined in wrong order

  zio/zio-json#1015 · Filter by author p3et opened on Sep 13, 2023
  1

• json 26 fields limitation

  zio/zio-json#1014 · Filter by author shmishleniy opened on Sep 7, 2023
  1

• Refined interop should include additional Validate instances

  help wanted
  zio/zio-json#975 · Filter by author gnp opened on Jul 2, 2023

• encodeJsonArrayPipeline produces incorrect JSON when stream is empty

  zio/zio-json#972 · Filter by author disordered opened on Jun 26, 2023

• Provide decoding directly from InputStream (and probably Reader) for JVM

  zio/zio-json#969 · Filter by author gnp opened on Jun 25, 2023

• [Bug] Duplicate keys are encoded in json

  zio/zio-json#942 · Filter by author bilal-fazlani opened on May 18, 2023

• NPE when there shouldn't be (with explicit nulls)

  zio/zio-json#920 · Filter by author bertlebee opened on Apr 3, 2023

• DeriveJsonEncoder and DeriveJsonDecoder don't pick up implicit Codec instances

  zio/zio-json#867 · Filter by author leszekgruchala opened on Jan 25, 2023

• Add support for ZIO Prelude New Types

  good first issuehelp wanted
  zio/zio-json#852 · Filter by author devsprint opened on Jan 13, 2023
  1

• Add Annotation to treat Either like some sort of "Union"

  zio/zio-json#773 · Filter by author BalduinLandolt opened on Oct 27, 2022
  1

• Support error accumulation

  zio/zio-json#771 · Filter by author Iltotore opened on Oct 27, 2022
  3