FasterXML/jackson-databind

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General data-binding package for Jackson: works on streaming API (core) implementation(s)

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Forks: 1.5k
Open beginner issues: 0
Indexed issues: 103
Avg merge: 3d 6h
Merged PRs (30d): 28

Dominant language: Java
License: Apache-2.0
Last GitHub push: Sep 15, 2026
Latest indexed: Sep 15, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

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103 open issues indexed

Support factories (external factory methods) Open

most-wanted pr-welcome

FasterXML/jackson-databind#3472 · 2 comments · 9 reactions · 0 assignees · Indexed Sep 15, 2026
Support prettifying of serializing json string with f.ex key and value different color Open

FasterXML/jackson-databind#3502 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add `MapperFeature` that allows defaulting creator properties as required Open

3.x pr-welcome

FasterXML/jackson-databind#3507 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
possibility to not require JsonTypeInfo annotation for sealed classes? Open

3.x polymorphic-handling

FasterXML/jackson-databind#3596 · 15 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
CBOR: finite-length maps support on ObjectMapper Open

FasterXML/jackson-databind#3679 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`@JsonSubTypes` declared on multiple interfaces of a class results in order-dependent resolution and outcome Open

has-failing-test will-not-fix

FasterXML/jackson-databind#3681 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`@JsonAnyGetter` can emit duplicate properties generating Invalid JSON Open

FasterXML/jackson-databind#4091 · 14 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support for Array Sorting during Deserialization Open

3.x

FasterXML/jackson-databind#4124 · 16 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support disallow list for default typing Open

polymorphic-handling

FasterXML/jackson-databind#4182 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Jackson Base64 is still better 🥳 Open

FasterXML/jackson-databind#4247 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Add new tag-on interface, `ToStringConverter` for "Key Serializers" to implement Open

FasterXML/jackson-databind#4276 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Allow changing serializer used for a single property of a Class Open

FasterXML/jackson-databind#4385 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Using `JsonInclude.Include.NON_DEFAULT` together with `JsonTypeInfo.defaultImpl` should exclude the type property Open

FasterXML/jackson-databind#4522 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Registering a converter for a type might incorrectly limit serializer construction for actual type Open

FasterXML/jackson-databind#4662 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Enum naming strategy should allow different naming conventions used in source code Open

enum pr-welcome

FasterXML/jackson-databind#4675 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Polymorphic Deserialization Based on Property (extend `DEDUCTION`) Open

polymorphic-deduction

FasterXML/jackson-databind#4714 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support `@JsonAnySetter` on setter method (single `Map` parameter) Open

pr-welcome

FasterXML/jackson-databind#4889 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Automatically detect target type (`Class`) to deserialize to Open

3.x

FasterXML/jackson-databind#5064 · 20 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Change `MapperFeature.OVERRIDE_PUBLIC_ACCESS_MODIFIERS` default to `false` for 3.0 (if and when `MethodHandle`s used) Open

3.2 3.x performance

FasterXML/jackson-databind#5074 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Consider possibility of allowing "delegating-AND-properties-based" Creators Open

2.19

FasterXML/jackson-databind#5084 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add `MapperFeature`s for disabling Field, Method, Creator introspection for JDK classes (and backing extension point) Open

3.x

FasterXML/jackson-databind#5149 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
A `Duplicate injectable value ...` error occurs only when the same ID `JacksonInject` is specified for a field multiple times Open

gen-ai

FasterXML/jackson-databind#5217 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
For multiple constructors, treat a single-arg record constructor as if it were a multiple-arg constructor with `@JsonProperty` annotations Open

3.x has-failing-test pr-welcome

FasterXML/jackson-databind#5222 · 21 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Allow accepting a JSON substring using a string instead of throwing an exception Open

FasterXML/jackson-databind#5233 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Jackson 3: `@JsonSubTypes` does not affect validity checks for `Id.CLASS`, only `Id.NAME` Open

3.x polymorphic-handling

FasterXML/jackson-databind#5320 · 8 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
`@JsonValue` ignores propertyInclusion rules for config overide Open

Record

FasterXML/jackson-databind#5380 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Combination of sealed class and polymorphism does not work as expected when deserializing json Open

polymorphic-deduction polymorphic-handling

FasterXML/jackson-databind#5496 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Jackson3 Deserialization with Properties Based constructor fails with tools.jackson.databind.exc.InvalidDefinitionException Open

need-test-case

FasterXML/jackson-databind#5593 · 19 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
JsonSetter.contentNulls propagates unexpectedly into nested structures Open

to-evaluate

FasterXML/jackson-databind#5742 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Optionally keeping token locations in `TreeTraversingParser` Open

to-evaluate

FasterXML/jackson-databind#5895 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support use of JSON Pointers (RFC 6901) for serializing object graphs (Object Id) Open

objectid

FasterXML/jackson-databind#5920 · 15 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Jackson3 finds constructors which Jackson2 did not, changing property serialization order Open

3.x

FasterXML/jackson-databind#6032 · 14 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Constructor binding: absent vs null Open

FasterXML/jackson-databind#6063 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Current token incorrectly reported when using `@JsonTypeInfo` Open

to-evaluate

FasterXML/jackson-databind#6091 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Jackson 3 migration – polymorphic use case differences in `readerFor` and `writerFor` expected? Open

FasterXML/jackson-databind#6093 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Spring Boot 4 / Jackson 3 ignores field default value during @RequestBody deserialization Open

lombok spring to-evaluate

FasterXML/jackson-databind#6100 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`JsonInclude.Include.NON_DEFAULT` doesn't seem to be working with collections/objects Open

to-evaluate

FasterXML/jackson-databind#6106 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Should there be a KeySerializer? Open

FasterXML/jackson-databind#6112 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Jackson StringNode has code to parse strings to numbers Open

FasterXML/jackson-databind#6131 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
introduce a date length setting Open

FasterXML/jackson-databind#6132 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`@JsonFilter` with `serializeAllExcept()` does not filter `@JsonAnyGetter` entries Open

3.3

FasterXML/jackson-databind#6136 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Jackson 3 requires a `public` visibility for an implicit `long`-argument delegating constructor, but not for the equivalent `String` one (Jackson 2 accepts both as `private`) Open

to-evaluate

FasterXML/jackson-databind#6144 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`@JsonIgnoreProperties` bypassed for Creator properties with builders and external type ids Open

FasterXML/jackson-databind#6145 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support conditional type ID inclusion during deserialization Open

to-evaluate

FasterXML/jackson-databind#6147 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`@JsonCreator` for enums converts value to String event if it is not Open

to-evaluate

FasterXML/jackson-databind#6164 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Is there a way to skip null values for properties handled by @JsonAnySetter? Open

FasterXML/jackson-databind#6170 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Add opt-in failure for duplicate elements when deserializing JSON arrays into Set types Open

FasterXML/jackson-databind#6177 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`@JacksonInject(useInput = OptBoolean.FALSE)` ignored for Field and Setter properties Open

FasterXML/jackson-databind#6201 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
@JsonAlias ignored in enum if @JsonValue is present Open

to-evaluate

FasterXML/jackson-databind#6210 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`DecimalNode` to `BigInteger` conversion no longer guarded by `StreamReadConstraints.validateBigIntegerScale()` in 3.x Open

FasterXML/jackson-databind#6214 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

FasterXML/jackson-databind

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