Issues

• Instance FromJSON Version is quadratic in the number of components

  haskell/aeson#1198 · Filter by author arybczak opened on Sep 26, 2026
  2

• There doesnt' seem to be throwDecodeFile :: (HasCallStack, FromJSON a) => FilePath -> IO a

  haskell/aeson#1188 · Filter by author phadej opened on Jul 15, 2026

• throwDecode doesn't have HasCallStack

  haskell/aeson#1187 · Filter by author phadej opened on Jul 15, 2026
  2

• Surprising behavior with Generic deriving

  haskell/aeson#1158 · Filter by author alexbiehl opened on Jan 14, 2026
  2

• Suggestion: Let error String of fromJSON contain json path info.

  haskell/aeson#1154 · Filter by author maralorn opened on Dec 17, 2025
  7

• Performance implications of ordered-keymap?

  haskell/aeson#1152 · Filter by author sjakobi opened on Nov 29, 2025

• What does ordered-keymap actually do?

  haskell/aeson#1151 · Filter by author Ptival opened on Nov 21, 2025
  1

• Feature request to (optionally) support "Python JSON" number extensions

  haskell/aeson#1150 · Filter by author ljwall opened on Nov 11, 2025

• Documentation examples for generic instances for ToJSONKey fail to compile

  haskell/aeson#1145 · Filter by author soenkehahn opened on Sep 17, 2025

• Use strict Vector in Value.

  haskell/aeson#1135 · Filter by author phadej opened on Jun 1, 2025

• The Solo instance is incorrect

  haskell/aeson#1119 · Filter by author Qqwy opened on Oct 5, 2024
  16

• Parse exception raised for combination of .: and .!=

  haskell/aeson#1110 · Filter by author quintenkasteel opened on Jul 5, 2024
  2

• Allow customization of record field unpacking for TaggedObject

  haskell/aeson#1090 · Filter by author tysonzero opened on Apr 4, 2024

• implement toMapText and fromMapText as unsafeCoerce?

  haskell/aeson#1086 · Filter by author MangoIV opened on Feb 29, 2024
  2

• Better error message when parsing data with BOM

  haskell/aeson#1082 · Filter by author adamgundry opened on Nov 7, 2023

• Getting issue while creating to create ToJSON instance using aeson template in aeson-1.4.7.1

  haskell/aeson#1074 · Filter by author adiR28 opened on Oct 5, 2023

• aeson-2.1.2.1 test suite fails on 32bit/i686

  haskell/aeson#1060 · Filter by author sternenseemann opened on Aug 14, 2023
  2

• Could not deduce RecordFromJSON' and RecordToPairs in aeson-2.2.0.0

  help wanted
  haskell/aeson#1059 · Filter by author julmb opened on Aug 12, 2023
  5

• Error message quality: parse vs iparse

  haskell/aeson#1057 · Filter by author marcosh opened on Aug 11, 2023

• Generically-like instances are much slower to compile since 2.0.0.0

  haskell/aeson#1053 · Filter by author amesgen opened on Jul 11, 2023
  16

• mention KeyValue change in 2.2 changelog

  haskell/aeson#1051 · Filter by author simonmichael opened on Jul 1, 2023
  1

• Make Sum type encoder more flexible

  haskell/aeson#1050 · Filter by author yaitskov opened on Jun 28, 2023
  2

• Generic instance with omitNothingFields = True is very slow

  haskell/aeson#1030 · Filter by author brprice opened on Jun 7, 2023
  1

• Generic encoding incorrect for some cases

  haskell/aeson#1016 · Filter by author yav opened on Apr 2, 2023
  1

• Need an option to cast string to int

  haskell/aeson#990 · Filter by author yaitskov opened on Jan 27, 2023
  1