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Java implementation of JSON Web Token (JWT)

There is a newer version: 4.4.0

package com.auth0.jwt.impl;

import com.auth0.jwt.RegisteredClaims;
import com.fasterxml.jackson.core.JsonGenerator;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

/**
 * Jackson serializer implementation for converting into JWT Payload parts.
 * 
 * This class is thread-safe.
 *
 * @see com.auth0.jwt.JWTCreator
 */
public class PayloadSerializer extends ClaimsSerializer {
    public PayloadSerializer() {
        super(PayloadClaimsHolder.class);
    }

    @Override
    protected void writeClaim(Map.Entry entry, JsonGenerator gen) throws IOException {
        if (RegisteredClaims.AUDIENCE.equals(entry.getKey())) {
            writeAudience(gen, entry);
        } else {
            super.writeClaim(entry, gen);
        }
    }

    /**
     * Audience may be a list of strings or a single string. This is needed to properly handle the aud claim when
     * added with the {@linkplain com.auth0.jwt.JWTCreator.Builder#withPayload(Map)} method.
     */
    private void writeAudience(JsonGenerator gen, Map.Entry e) throws IOException {
        if (e.getValue() instanceof String) {
            gen.writeFieldName(e.getKey());
            gen.writeString((String) e.getValue());
        } else {
            List audArray = new ArrayList<>();
            if (e.getValue() instanceof String[]) {
                audArray = Arrays.asList((String[]) e.getValue());
            } else if (e.getValue() instanceof List) {
                List audList = (List) e.getValue();
                for (Object aud : audList) {
                    if (aud instanceof String) {
                        audArray.add((String) aud);
                    }
                }
            }
            if (audArray.size() == 1) {
                gen.writeFieldName(e.getKey());
                gen.writeString(audArray.get(0));
            } else if (audArray.size() > 1) {
                gen.writeFieldName(e.getKey());
                gen.writeStartArray();
                for (String aud : audArray) {
                    gen.writeString(aud);
                }
                gen.writeEndArray();
            }
        }
    }
}