// Test that unicode strings are properly encoded/decoded
        String unicodeString = "日本語テスト";
        String encoded = BaseEncoding.base64().encode(unicodeString.getBytes(StandardCharsets.UTF_8));
        String decoded = new String(BaseEncoding.base64().decode(encoded), StandardCharsets.UTF_8);

        assertEquals(unicodeString, decoded);
    }

    @Test

     * </p>
     *
     * @param inData
     *            The data to decode
     * @return The decoded data, or null if the input is null or empty
     */
    public static byte[] decode(final String inData) {
        if (StringUtil.isEmpty(inData)) {
            return null;
        }
        return Base64.getDecoder().decode(inData);
    }

        final byte[] decoded = Base64Util.decode(encoded);
        assertEquals("Decoded should have same length", 2, decoded.length);
        assertEquals("First byte should match", twoBytes[0], decoded[0]);
        assertEquals("Second byte should match", twoBytes[1], decoded[1]);
    }

    /**
     * Test backward compatibility with standard Base64
     *
     * @throws Exception
     */

        return stream(getRoles()).get(stream -> stream.map(this::decode).toArray(n -> new String[n]));
    }

    @Override
    public String[] getGroupNames() {
        return stream(getGroups()).get(stream -> stream.map(this::decode).toArray(n -> new String[n]));
    }

    private String decode(final String value) {
        return new String(Base64.getDecoder().decode(value), Constants.CHARSET_UTF_8);
    }

    @Override

    }

    /**
     * Decodes the given host string using the specified encoding.
     *
     * @param host the host string to decode
     * @return the decoded host string
     */
    protected String decode(final String host) {
        if (host.indexOf('%') == -1) {
            return host;
        }
        try {
            return URLDecoder.decode(host, encoding);

{* ../../docs_src/json_base64_bytes/tutorial001_py310.py ln[1:9,29:35] hl[9] *}

If you check the `/docs`, they will show that the field `data` expects base64 encoded bytes:

<div class="screenshot">
<img src="/img/tutorial/json-base64-bytes/image01.png">
</div>

You could send a request like:

      return decode(certificatePem, pkcs8Base64)
    }

    private fun decode(
      certificatePem: String,
      pkcs8Base64Text: String,
    ): HeldCertificate {
      val certificate = certificatePem.decodeCertificatePem()

      val pkcs8Bytes =
        pkcs8Base64Text.decodeBase64()
          ?: throw IllegalArgumentException("failed to decode private key")

         */
        protected Map<String, Long> valueCountMap = new LinkedHashMap<>();

        /**
         * The decoded name of the field.
         */
        protected String name;

        /**
         * Constructs a Field from OpenSearch Terms aggregation.
         * Decodes the field name and processes all term buckets to extract
         * field values and their document counts.
         *

        return permission;
    }

    /**
     * Decodes a search role format string back to a permission string.
     * Reverses the encoding process to restore original permission format.
     *
     * @param value the encoded permission string to decode
     * @return the decoded permission string, or null if the input is blank or invalid
     */
    public String decode(final String value) {
        if (StringUtil.isBlank(value)) {

                enc = encoding;
            }

            try {
                url = URLDecoder.decode(url, enc);
            } catch (final Exception e) {
                // Failed to decode URL, using original URL as-is
                if (getLogger().isDebugEnabled()) {
                    getLogger().debug("Failed to decode URL with encoding {}: {}", enc, url, e);
                }
            }
        }