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json4s

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json4s
JSON library

Scala · 1486 stars

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render function escapes unicode characters that are not control ones (currencies ...) Open

Difficulty 2/5 1-3 hours Newbie friendliness 50/100

json4s/json4s#1811 · Opened Feb 5, 2026
Need a fallback mechanism to allow custom serializer to be tried AFTER the default serializer fail. Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

json4s/json4s#1605 · 1 comment · Opened Jan 27, 2025
IndexOutOfBoundsException when parsing a Map[String, String] Open

Difficulty 3/5 1-2 days Newbie friendliness 32/100

json4s/json4s#1575 · 1 comment · Opened Dec 19, 2024
Incorrect parsing of ISO date time with microseconds Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

json4s/json4s#1565 · 3 comments · Opened Nov 16, 2024
Performance issue with List extraction Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

json4s/json4s#1544 · 1 reaction · Opened Oct 12, 2024
NoSuchMethodError Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

json4s/json4s#1459 · Opened Apr 23, 2024
Unsound deserialization involving AnyVal on scala 3 Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

json4s/json4s#1453 · 2 reactions · Opened Apr 11, 2024
support Jackson StreamReadConstraints Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

json4s/json4s#1444 · Opened Mar 17, 2024
possible perf issues with Jackson 2.17 Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

json4s/json4s#1443 · 1 comment · 1 reaction · Opened Mar 14, 2024
In Json4s-jackson with Scala 2, FieldSerializer doesn't compose well with @JsonAlias Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

json4s/json4s#1427 · Opened Feb 16, 2024
JBool can not be extracted to String Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

json4s/json4s#1426 · 1 comment · Opened Feb 13, 2024
Spark 3.3.0 or greater than 3.3.0 versions giving class not found with json4s library Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

json4s/json4s#1425 · 1 comment · 5 reactions · Opened Feb 13, 2024
failure extracting null to None when strict and disallow-nulls are specified Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

json4s/json4s#1398 · 1 reaction · Opened Dec 9, 2023
Diff on arrays with single values is reducing them to the value Open

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

json4s/json4s#1384 · 1 reaction · Opened Oct 23, 2023
Xml to json conversion with sibling elements with the same tag Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

json4s/json4s#1348 · Opened Aug 22, 2023
Wildcard/underscore serialization issue Mapping Exception Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

json4s/json4s#1250 · Opened Mar 15, 2023
Invalid input for optional fields should result in a MappingException, regardless of strictOptionParsing Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

json4s/json4s#1203 · Opened Jan 2, 2023
support jackson's fast number parsing/writing features Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

json4s/json4s#1198 · Opened Dec 17, 2022
Getting NoSuchMethodError with scala 2.12.10 and spark 3.2.0 Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

json4s/json4s#1169 · 3 comments · 5 reactions · Opened Nov 7, 2022
ShortTypeHints does not work with `object` Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

json4s/json4s#1162 · 1 comment · Opened Nov 1, 2022
ShortTypeHints don't work for backtick-quoted class names Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

json4s/json4s#1150 · Opened Oct 20, 2022
extraction always yield empty JObject if loaded AFTER scalatest 3.2.10 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

json4s/json4s#1082 · 1 comment · Opened Jun 11, 2022
Could not find implicit value for evidence parameter of type org.json4s.AsJsonInput in json4s 4.0.4 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

json4s/json4s#1034 · Opened Mar 23, 2022
json4s parsing StructType Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

json4s/json4s#1028 · Opened Mar 13, 2022
Contextual deserialization of a field based on multiple fields? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

json4s/json4s#1022 · Opened Feb 22, 2022
Deprecation Warning for extract with Scala 3 Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

json4s/json4s#982 · 3 comments · 13 reactions · Opened Jan 14, 2022
MappingException: unknown error with using json4s on spark datasets Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

json4s/json4s#857 · Opened Sep 3, 2021
cannot transform from AST Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

json4s/json4s#849 · Opened Aug 18, 2021
json4s-jackson-core: no implicit MonadicJValue Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

json4s/json4s#815 · Opened Jun 26, 2021
Security considerations: `FullTypeHints` and `org.json4s.jackson.Serialization::read` DDoS Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

json4s/json4s#805 · 1 reaction · Opened Jun 5, 2021
Parsing 10ks of JSON documents hits bottleneck on ParserUtil segment pool. Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

json4s/json4s#771 · 7 comments · Opened Mar 6, 2021
java.time.Instant serializer (and probably others too) is dropping sub-milliseconds Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

json4s/json4s#767 · 1 comment · Opened Feb 24, 2021
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask. org.json4s.jackson.JsonMethods$.parse$default$3()Z Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

json4s/json4s#756 · 1 comment · Opened Jan 20, 2021
Create new issue template Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

json4s/json4s#748 · Opened Jan 10, 2021
CustomSerializer[Enumeration.Value] clobbers EnumNameSerializer() Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

json4s/json4s#712 · 2 comments · Opened Aug 6, 2020
De-serialization polymorphic lists Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

json4s/json4s#709 · Opened Aug 4, 2020
Formats.typeHints.typeHintFieldName is inaccurate Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

json4s/json4s#706 · 1 comment · Opened Jul 27, 2020
Extraction.decompose fails on case class with secondary implicit arguments list : org.json4s.package$MappingException: Can't find constructor Open

improvement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

json4s/json4s#702 · 7 comments · Opened Jul 6, 2020
convert xml to json Open

bug enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

json4s/json4s#682 · 2 comments · 2 reactions · Opened May 19, 2020
Serializer & KeySerializer should be Serializable Open

improvement

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

json4s/json4s#680 · 2 comments · 2 reactions · Opened May 15, 2020
Improve numeric type interoperability with ECMAScript JSON Open

improvement

Difficulty 5/5 Over a week Newbie friendliness 35/100

json4s/json4s#678 · 1 reaction · Opened May 11, 2020
Types extending Iterable[_] are not rendered correctly Open

improvement

Difficulty 4/5 3-5 days Newbie friendliness 42/100

json4s/json4s#677 · 3 comments · Opened May 9, 2020
Question: Raise exception while extraction object with the wrong schema on the Optional field Open

question

Difficulty 3/5 1-2 days Newbie friendliness 30/100

json4s/json4s#672 · Opened Apr 30, 2020
camelizeKeys/snakelizeKey for all case classes Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

json4s/json4s#665 · Opened Apr 5, 2020
Provide a format configuration that retains pre-3.6 behavior for strictOptionParsing. Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

json4s/json4s#664 · 3 comments · Opened Apr 3, 2020
Constructor matcher downvotes arguments with defaults, which may choose least correct option. Open

Difficulty 3/5 1-2 days Newbie friendliness 30/100

json4s/json4s#661 · 5 comments · Opened Mar 25, 2020
Using Hints prevent hot reloading in Play Open

enhancement improvement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

json4s/json4s#652 · 2 comments · 1 reaction · Opened Feb 13, 2020
extract should fail on extra fields Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

json4s/json4s#650 · 6 comments · Opened Feb 10, 2020
extractOpt[String] seems to be broken in 3.6.x Open

improvement

Difficulty 3/5 1-2 days Newbie friendliness 42/100

json4s/json4s#648 · 7 comments · Opened Jan 13, 2020
Unexpectedly returns default values for entire case class when one field is missing Open

documentation

Difficulty 4/5 3-5 days Newbie friendliness 35/100

json4s/json4s#647 · 6 comments · Opened Jan 6, 2020

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