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-2.12.4-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/ser/std/StdKeySerializer.java

package com.fasterxml.jackson.databind.ser.std;

import java.io.IOException;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;

/**
 * Specialized serializer that can be used as the generic key serializer,
 * when serializing {@link java.util.Map}s to JSON Objects.
 *
 * @deprecated Since 2.8, use {@link StdKeySerializers.Default} instead.
 */
@SuppressWarnings("serial")
@Deprecated // since 2.8,
public class StdKeySerializer extends StdSerializer<Object>
{
    public StdKeySerializer() { super(Object.class); }

    @Override
    public void serialize(Object value, JsonGenerator g, SerializerProvider provider) throws IOException {
        // 19-Oct-2016, tatu: Simplified to bare essentials since this is deprecated
        g.writeFieldName(value.toString());
    }
}

⏎ com/fasterxml/jackson/databind/ser/std/StdKeySerializer.java

 

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⇑⇑ Jackson - Java JSON library