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/StdConverter.java

package com.fasterxml.jackson.databind.util;

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

/**
 * Standard implementation of {@link Converter} that supports explicit
 * type access, instead of relying type detection of generic type
 * parameters. 
 * 
 * @since 2.2
 */
public abstract class StdConverter<IN,OUT>
    implements Converter<IN,OUT>
{
    /*
    /**********************************************************
    /* Partial Converter API implementation
    /**********************************************************
     */

    @Override
    public abstract OUT convert(IN value);

    @Override
    public JavaType getInputType(TypeFactory typeFactory) {
        return _findConverterType(typeFactory).containedType(0);
    }

    @Override
    public JavaType getOutputType(TypeFactory typeFactory) {
        return _findConverterType(typeFactory).containedType(1);
    }

    protected JavaType _findConverterType(TypeFactory tf) {
        JavaType thisType = tf.constructType(getClass());
        JavaType convType = thisType.findSuperType(Converter.class);
        if (convType == null || convType.containedTypeCount() < 2) {
            throw new IllegalStateException("Cannot find OUT type parameter for Converter of type "+getClass().getName());
        }
        return convType;
    }
}

⏎ com/fasterxml/jackson/databind/util/StdConverter.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 

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⇑⇑ Jackson - Java JSON library