News:

• 31-Jan-2010: Jackson 1.4.2 and 1.3.4 released.
• 11-Jan-2010: Jackson 1.4.1 released.
• 21-Dec-2009: Jackson 1.3.3 released.
• 19-Dec-2009: Jackson 1.4.0 released; available at [Jackson@FasterXML ]!
• 02-Dec-2009: Jackson 1.3.2 released.
• 23-Nov-2009: Jackson 1.3.1 released
• 30-Oct-2009: Jackson 1.3.0 released
• 03-Oct-2009: Maintenance release, 1.2.1, at FasterXML.com .
• 02-Aug-2009: Jackson 1.2.0 released! Now with BYOC (Bring Your Own Constructors), and Mix-in annotations... and [Lotsa More ]!
• 31-Jul-2009: Jackson 1.1.2 patch release available at FasterXML.com
• 18-Jul-2009: Jackson 1.1.1, a patch release with couple of fixes (core jar had some mapper classes; compilation failed on JDK 1.5, handling of NaN floats) released
• 26-Jun-2009: Moving more of documentation to FasterXML.com
• 22-Jun-2009: Jackson 1.1.0 released; highlights are: support for using JAXB annotations, generating JSON Schema, allowing fields to be directly serialized/deserialized, and simpler set of core annotations (@JsonProperty, @JsonSerialize and @JsonDeserializer).
• 04-Jun-2009: Jackson 1.0.1, minor patch release with a single fix, released.
• 08-May-2009: Jackson 1.0.0 released
• 27-Apr-2009: Second 1.0 release candidate (0.9.9-6) released: much improved Jax-RS provider for doing "Clean Json" on Jersey
• 20-Apr-2009: First 1.0 release candidate (0.9.9-5) released!
• 14-Apr-2009: 0.9.9-4 released, generics-related bug fixes. Getting yet closer to 1.0.0...
• 03-Apr-2009: 0.9.9-3 released, lots of bug fixes.
• 13-Mar-2009: 0.9.9-2 released, paving the way for 1.0.0 release (please test!)
• 02-Mar-2009: 0.9.9 released: lots of minor improvements, but perhaps most importantly, now comes with a proper JAX-RS Json Content handler: No more Franken-JSON with JAX-RS!
• 16-Feb-2009: 0.9.8 released: most basic annotations now implemented, JsonParser/JsonGenerator connected to ObjectMapper (iff using MappingJsonFactory).
• 10-Feb-2009: Started writing some Documentation, including Tutorial.
• 04-Feb-2009: 0.9.7 released: complete binary/base64 support, other misc improvements
• 14-Jan-2009: 0.9.6 released: now with full-featured DE-serialization, too. That is, complete POJO/Bean data mapping support!
• 10-Dec-2008: 0.9.5 released: now with full-featured serialization, including Bean serialization (just missing Bean deserialization)

For older news, see News page.

What is Jackson?

Jackson is a:

• Streaming (reading, writing)
• FAST (measured to be faster than any other Java json parser and data binder)
• Powerful (full data binding for common JDK classes as well as any Java bean class, Collection, Map or Enum)
• Zero-dependency (does not rely on other packages beyond JDK)
• Open Source (LGPL or AL)
• Fully conformant

JSON processor (JSON parser + JSON generator) written in Java. Beyond basic JSON reading/writing (parsing, generating), it also offers full node-based Tree Model, as well as full OJM (Object/Json Mapper) data binding functionality.

Where can I find it?

See Download page for downloadable versions.

For historical interest (only), the old home page is still available at http://www.cowtowncoder.com/hatchery/jackson/.

How do I use it?

Documentation page has full list of entries, but here are some quickie links:

• Tutorial gets you started
• Cowtown Blog has articles on Jackson usage amongst other things

Who can help me with my (potential) Jackson use?

If you need help using Jackson – or just figuring if you would want to use it – there are resources available to help you. Beyond Documentation available from this site, you can consult:

• Jackson mailing lists offer best-effort support by authors, contributors and others users.
• Specialists at FasterXML can offer wider range of commercial support, including enterprise integration and consultation services.