The library uses the following mapping from JSON values types to CBOR types according to the CBOR specification (RFC 7049):
JSON value type | value/range | CBOR type | first byte |
null | null | Null | 0xF6 |
boolean | true | True | 0xF5 |
boolean | false | False | 0xF4 |
number_integer | -9223372036854775808..-2147483649 | Negative integer (8 bytes follow) | 0x3B |
number_integer | -2147483648..-32769 | Negative integer (4 bytes follow) | 0x3A |
number_integer | -32768..-129 | Negative integer (2 bytes follow) | 0x39 |
number_integer | -128..-25 | Negative integer (1 byte follow) | 0x38 |
number_integer | -24..-1 | Negative integer | 0x20..0x37 |
number_integer | 0..23 | Integer | 0x00..0x17 |
number_integer | 24..255 | Unsigned integer (1 byte follow) | 0x18 |
number_integer | 256..65535 | Unsigned integer (2 bytes follow) | 0x19 |
number_integer | 65536..4294967295 | Unsigned integer (4 bytes follow) | 0x1A |
number_integer | 4294967296..18446744073709551615 | Unsigned integer (8 bytes follow) | 0x1B |
number_unsigned | 0..23 | Integer | 0x00..0x17 |
number_unsigned | 24..255 | Unsigned integer (1 byte follow) | 0x18 |
number_unsigned | 256..65535 | Unsigned integer (2 bytes follow) | 0x19 |
number_unsigned | 65536..4294967295 | Unsigned integer (4 bytes follow) | 0x1A |
number_unsigned | 4294967296..18446744073709551615 | Unsigned integer (8 bytes follow) | 0x1B |
number_float | any value | Double-Precision Float | 0xFB |
string | length: 0..23 | UTF-8 string | 0x60..0x77 |
string | length: 23..255 | UTF-8 string (1 byte follow) | 0x78 |
string | length: 256..65535 | UTF-8 string (2 bytes follow) | 0x79 |
string | length: 65536..4294967295 | UTF-8 string (4 bytes follow) | 0x7A |
string | length: 4294967296..18446744073709551615 | UTF-8 string (8 bytes follow) | 0x7B |
array | size: 0..23 | array | 0x80..0x97 |
array | size: 23..255 | array (1 byte follow) | 0x98 |
array | size: 256..65535 | array (2 bytes follow) | 0x99 |
array | size: 65536..4294967295 | array (4 bytes follow) | 0x9A |
array | size: 4294967296..18446744073709551615 | array (8 bytes follow) | 0x9B |
object | size: 0..23 | map | 0xA0..0xB7 |
object | size: 23..255 | map (1 byte follow) | 0xB8 |
object | size: 256..65535 | map (2 bytes follow) | 0xB9 |
object | size: 65536..4294967295 | map (4 bytes follow) | 0xBA |
object | size: 4294967296..18446744073709551615 | map (8 bytes follow) | 0xBB |