# JSON Compatible Encoder { #json-compatible-encoder }

There are some cases where you might need to convert a data type (like a Pydantic model) to something compatible with JSON (like a `dict`, `list`, etc).

For example, if you need to store it in a database.

For that, **FastAPI** provides a `jsonable_encoder()` function.

## Using the `jsonable_encoder` { #using-the-jsonable-encoder }

    /**
     *
     */
    private Strings() {
    }

    /**
     * Encodes a string into bytes using the specified encoding.
     *
     * @param str the string to encode
     * @param encoding the character encoding to use
     * @return encoded byte array, or empty array if str is null
     */
    public static byte[] getBytes(final String str, final Charset encoding) {

        return src[si] & 0xFF | (src[si + 1] & 0xFF) << 8 | (src[si + 2] & 0xFF) << 16 | (src[si + 3] & 0xFF) << 24;
    }

    /* Encode and decode 64 bit integers
     */

    /**
     * Encodes a 64-bit unsigned integer in big-endian byte order.
     *
     * @param l the long value to encode
     * @param dst the destination byte array
     * @param di the starting index in the destination array

            DECODE_TABLE[ENCODE_TABLE[i]] = (byte) i;
        }
    }

    /**
     * Encodes data in Base64.
     *
     * @param inData
     *            The data to encode
     * @return The encoded data
     */
    public static String encode(final byte[] inData) {
        if (ArrayUtil.isEmpty(inData)) {
            return "";
        }
        final int mod = inData.length % 3;

    }

    public void test_unicode_base64_encoding() {
        // 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);
    }

            context = new PreauthIntegrityNegotiateContext(mockConfig, hashAlgos, salt);
            int encoded = context.encode(buffer, 0);

            assertEquals(4 + (count * 2) + 16, encoded);
            assertEquals(context.size(), encoded);
        }

        @Test
        @DisplayName("Should encode and decode correctly")
        void testEncodeAndDecode() throws SMBProtocolDecodingException {

    /**
     * Base-64 encodes the supplied block of data.  Line wrapping is not
     * applied on output.
     *
     * @param bytes The block of data that is to be Base-64 encoded.
     * @return A <code>String</code> containing the encoded data.
     */
    public static String encode(final byte[] bytes) {
        int length = bytes.length;
        if (length == 0) {

        when(mockFileInfo.encode(dst, 0)).thenReturn(8);
        when(mockFileInfo.size()).thenReturn(8);

        // Test encode
        int encoded = mockFileInfo.encode(dst, 0);
        assertEquals(8, encoded);

        // Test size
        int size = mockFileInfo.size();
        assertEquals(8, size);

        // Verify interactions
        verify(mockFileInfo).encode(dst, 0);

	buf.WriteString(xxml.Header)
	if err := xxml.NewEncoder(&buf).Encode(response); err != nil {
		bugLogIf(GlobalContext, err)
		return nil
	}
	return buf.Bytes()
}

// Encodes the response headers into JSON format.
func encodeResponseJSON(response any) []byte {
	var bytesBuffer bytes.Buffer
	e := json.NewEncoder(&bytesBuffer)
	e.Encode(response)
	return bytesBuffer.Bytes()
}

// Write parts count

            int encoded = originalContext.encode(buffer, 0);
            assertEquals(2 + (2 * maxCiphers), encoded);

            EncryptionNegotiateContext decodedContext = new EncryptionNegotiateContext();
            int decoded = decodedContext.decode(buffer, 0, encoded);

            assertEquals(encoded, decoded);
            assertArrayEquals(ciphers, decodedContext.getCiphers());