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/package-info.java

/**
 * Main public API classes of the core streaming JSON
 * processor: most importantly {@link com.fasterxml.jackson.core.JsonFactory}
 * used for constructing
 * JSON parser ({@link com.fasterxml.jackson.core.JsonParser})
 * and generator
 * ({@link com.fasterxml.jackson.core.JsonGenerator})
 * instances.
 * <p>
 * Public API of the higher-level mapping interfaces ("Mapping API")
 * is found from the "jackson-databind" bundle, except for following
 * base interfaces that are defined here:
 * <ul>
 *<li>{@link com.fasterxml.jackson.core.TreeNode} is included
 *within Streaming API to support integration of the Tree Model
 *(which is based on <code>JsonNode</code>) with the basic
 *parsers and generators (iff using mapping-supporting factory: which
 *is part of Mapping API, not core)
 *  </li>
 *<li>{@link com.fasterxml.jackson.core.ObjectCodec} is included so that
 *  reference to the object capable of serializing/deserializing
 *  Objects to/from JSON (usually, <code>com.fasterxml.jackson.databind.ObjectMapper</code>)
 *  can be exposed, without adding direct dependency to implementation.
 *  </li>
 *</ul>
 */

package com.fasterxml.jackson.core;

⏎ com/fasterxml/jackson/core/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 

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⇐ What Is Jackson

⇑ Downloading and Reviewing jackson-*.jar

⇑⇑ Jackson - Java JSON library