Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

Jackson Core Source Code files are provided in the source packge (jackson-core-2.14.0-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Core Source Code below:

⏎ com/fasterxml/jackson/core/type/package-info.java

/**
 * Contains classes needed for type introspection, mostly used by data binding
 * functionality. Most of this functionality is needed to properly handled
 * generic types, and to simplify and unify processing of things Jackson needs
 * to determine how contained types (of {@link java.util.Collection} and
 * {@link java.util.Map} classes) are to be handled.
 *<p>
 * With 2.9, an additional type ({@link com.fasterxml.jackson.core.type.WritableTypeId})
 * was added to help handling of type identifiers needed to support polymorphic
 * type serialization, deserialization.
 */
package com.fasterxml.jackson.core.type;

⏎ com/fasterxml/jackson/core/type/package-info.java

Or download all of them as a single archive file:

File name: jackson-core-2.14.0-sources.jar
File size: 497693 bytes
Release date: 2022-11-05
Download 

⇒ Download and Install Jackson Binary Package

⇐ What Is Jackson

⇑ Downloading and Reviewing jackson-*.jar

⇑⇑ Jackson - Java JSON library