FasterXML/jackson-databind

View on GitHub

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

Stars: 3.7k
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

Open All

103 issues indexed so far

Add support for basic "is-required" checks on deserialization using `@JsonProperty(required=true)` Open

3.x most-wanted

FasterXML/jackson-databind#230 · 9 comments · 7 reactions · 0 assignees · Indexed Sep 15, 2026
@JsonUnwrapped completeness: allow more flexible renaming Open

most-wanted

FasterXML/jackson-databind#385 · 2 comments · 8 reactions · 0 assignees · Indexed Sep 15, 2026
Allow reading/writing `writerExcludingView()`/`readerExcludingView()` (JsonView exclusion) Open

most-wanted need-test-case

FasterXML/jackson-databind#456 · 19 comments · 11 reactions · 0 assignees · Indexed Sep 15, 2026
Add `@JsonWrapped` Open

most-wanted

FasterXML/jackson-databind#512 · 26 comments · 11 reactions · 0 assignees · Indexed Sep 15, 2026
Add a feature to require "complete" creators; that is, to prevent use of setters if using property-based creator Open

FasterXML/jackson-databind#567 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Allow JsonDeserializer to provide default value for "missing" properties Open

FasterXML/jackson-databind#618 · 3 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Allow handling of unresolved forward references when using @JsonIdentityInfo(resolver = ..) Open

FasterXML/jackson-databind#670 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Allow pre-definition of object ids before serialisation/deserialisation Open

FasterXML/jackson-databind#693 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Allow custom formats in JSON Schemas Open

3.x

FasterXML/jackson-databind#757 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add serialization feature: strict numbers (FPs that fit `long`, Javascript compatibility) Open

FasterXML/jackson-databind#911 · 22 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Force root wrapping per class Open

most-wanted

FasterXML/jackson-databind#1022 · 12 comments · 12 reactions · 0 assignees · Indexed Sep 15, 2026
@JsonIgnoreProperties does not stack Open

3.x

FasterXML/jackson-databind#1037 · 10 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Support `@JsonFormat` for `String`, numbers, using String.format() Open

3.x

FasterXML/jackson-databind#1114 · 22 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Allow use of `@JsonFormat(shape=Shape.STRING)` for `string[]`, `int[]`, `long[]` Open

3.x

FasterXML/jackson-databind#1242 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add mechanism, annotation, to handle "JSON-in-JSON" case Open

FasterXML/jackson-databind#1375 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`JsonGenerator` cannot write binary-valued property names Open

3.x

FasterXML/jackson-databind#1553 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add `convertValue()` method to `ObjectReader` Open

most-wanted

FasterXML/jackson-databind#1591 · 4 comments · 7 reactions · 0 assignees · Indexed Sep 15, 2026
mapper-wide root value naming configuration? Open

FasterXML/jackson-databind#1621 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`@JsonPropertyOrder` partially ignored when `@JsonUnwrapped` is used Open

3.x

FasterXML/jackson-databind#1670 · 8 comments · 4 reactions · 0 assignees · Indexed Sep 15, 2026
Add feature for writing Java `null` Strings as `""`, write null `java.util.Collection` or array as `[]` Open

FasterXML/jackson-databind#1815 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add support for static `@JsonCreator` factory methods in Mixin classes Open

most-wanted

FasterXML/jackson-databind#1820 · 10 comments · 30 reactions · 0 assignees · Indexed Sep 15, 2026
`@JsonAppend` not following sort order specified in `@JsonPropertyOrder` Open

FasterXML/jackson-databind#1827 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Polymorphic serialization: use property name directly as type info, without wrapper Open

polymorphic-handling

FasterXML/jackson-databind#2005 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support `@JsonIdentityInfo` for Map-valued properties Open

objectid

FasterXML/jackson-databind#2012 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`@PreSerialize` / `@PostDeserialize` method annotations Open

most-wanted

FasterXML/jackson-databind#2045 · 1 comment · 18 reactions · 0 assignees · Indexed Sep 15, 2026
JsonSerialize.keyUsing propagates in values of the Map Open

3.x

FasterXML/jackson-databind#2050 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Provide comparator for TreeMap deserialisation Open

most-wanted

FasterXML/jackson-databind#2162 · 9 comments · 5 reactions · 0 assignees · Indexed Sep 15, 2026
Deserializing nested xml within json Open

FasterXML/jackson-databind#2242 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Exception while deserializing with `@JsonRootName` when multiple root properties Open

FasterXML/jackson-databind#2253 · 15 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Make it possible to use `@JsonPropertyOrder` to order properties last (not just first) Open

FasterXML/jackson-databind#2260 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Support specifying method for instantiating builders in `@JsonDeserialize` Open

builder-related most-wanted

FasterXML/jackson-databind#2354 · 11 comments · 5 reactions · 0 assignees · Indexed Sep 15, 2026
Location incorrectly reported when using `@JsonTypeInfo` Open

polymorphic-handling

FasterXML/jackson-databind#2386 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
It would be good if custom annotations from value class were used for Builder too Open

builder-related

FasterXML/jackson-databind#2391 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Two Type fields in serialised string, when using using `As.EXTERNAL_PROPERTY` with `@JsonTypeName` Open

FasterXML/jackson-databind#2844 · 5 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Allow for multiple `@JsonAnySetter` when `@JsonUnwrapped` is supplied Open

FasterXML/jackson-databind#2877 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`@JsonFormat` Support for locale specific number format Open

FasterXML/jackson-databind#2945 · 8 comments · 4 reactions · 0 assignees · Indexed Sep 15, 2026
Allow registering a hook to modify/pre-process String values read Open

most-wanted

FasterXML/jackson-databind#2971 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Polymorphic subtype deduction based on 'presence' of fields does not take 'absence' of fields into account Open

has-failing-test polymorphic-deduction

FasterXML/jackson-databind#2976 · 20 comments · 4 reactions · 0 assignees · Indexed Sep 15, 2026
`@JsonIgnoreProperties(ignoreUnknown=false)` can not override `DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES=false` Open

3.x has-failing-test most-wanted

FasterXML/jackson-databind#3067 · 10 comments · 10 reactions · 0 assignees · Indexed Sep 15, 2026
Consider using `AccessibleObject.trySetAccessible()` instead of `setAccessible()` in `ClassUtil.checkAndFixAccess()` -- CANNOT, Android doesn't have it!!! Open

3.2 android

FasterXML/jackson-databind#3118 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Map Key interface not serialized with both type serializer or keyUsing Open

FasterXML/jackson-databind#3119 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`@JsonDeserialize` on a super class pointing to a sibling class makes Jackson deserialize using that sibling class Open

3.x

FasterXML/jackson-databind#3145 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Polymorphic subtype deduction behaves differently based on order of fields Open

polymorphic-deduction

FasterXML/jackson-databind#3183 · 11 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
support ObjectType - like JavaType but without dependence on Java class introspection Open

FasterXML/jackson-databind#3278 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support optional serialization/deserialization of map with non-string key type Open

FasterXML/jackson-databind#3283 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Inner classes that get their generic information from an outer class lose type information Open

FasterXML/jackson-databind#3288 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Deduction deserialization - add support for pojo-hierarchies such that the absence of child fields infers a supertype Open

polymorphic-deduction

FasterXML/jackson-databind#3289 · 20 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Provide an ObjectMapper configuration (`DeserializationFeature`) to automatically do `clearLocation()` for `JacksonException` Open

FasterXML/jackson-databind#3340 · 5 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
JSON5: Provide a way to read/write a comment using `JsonNode` Open

FasterXML/jackson-databind#5377 · 4 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Unsigned integers Open

most-wanted

FasterXML/jackson-databind#3359 · 1 comment · 5 reactions · 0 assignees · Indexed Sep 15, 2026

FasterXML/jackson-databind

Get new issues in your inbox