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

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

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/util/Converter.java

package com.fasterxml.jackson.databind.util;

import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.type.TypeFactory;

/**
 * Helper interface for things that convert Objects of
 * one type to another.
 *<p>
 * NOTE: implementors are strongly encouraged to extend {@link StdConverter}
 * instead of directly implementing {@link Converter}, since that can
 * help with default implementation of typically boiler-plate code.
 *
 * @param <IN> Type of values converter takes
 * @param <OUT> Result type from conversion
 *
 * @see com.fasterxml.jackson.databind.ser.std.StdDelegatingSerializer
 * @see com.fasterxml.jackson.databind.deser.std.StdDelegatingDeserializer
 *
 * @since 2.1
 */
public interface Converter<IN,OUT>
{
    /**
     * Main conversion method.
     */
    public OUT convert(IN value);

    /**
     * Method that can be used to find out actual input (source) type; this
     * usually can be determined from type parameters, but may need
     * to be implemented differently from programmatically defined
     * converters (which cannot change static type parameter bindings).
     * 
     * @since 2.2
     */
    public JavaType getInputType(TypeFactory typeFactory);

    /**
     * Method that can be used to find out actual output (target) type; this
     * usually can be determined from type parameters, but may need
     * to be implemented differently from programmatically defined
     * converters (which cannot change static type parameter bindings).
     * 
     * @since 2.2
     */
    public JavaType getOutputType(TypeFactory typeFactory);
    
    /*
    /**********************************************************
    /* Helper class(es)
    /**********************************************************
     */

    /**
     * This marker class is only to be used with annotations, to
     * indicate that <b>no converter is to be used</b>.
     *<p>
     * Specifically, this class is to be used as the marker for
     * annotation {@link com.fasterxml.jackson.databind.annotation.JsonSerialize},
     * property <code>converter</code> (and related)
     * 
     * @since 2.2
     */
    public abstract static class None
        implements Converter<Object,Object> { }
}

⏎ com/fasterxml/jackson/databind/util/Converter.java

Or download all of them as a single archive file:

File name: jackson-databind-2.14.0-sources.jar
File size: 1187952 bytes
Release date: 2022-11-05
Download 

⇒ Jackson Annotations Source Code

⇐ Download and Install Jackson Binary Package

⇑ Downloading and Reviewing jackson-*.jar

⇑⇑ Jackson - Java JSON library