CBOR cheatsheet

cheatsheet.md

CBOR cheatsheet

Major type	Description	Binary	Shorthand
0	an unsigned integer	000_xxxxx	unsigned(#)
1	a negative integer	001_xxxxx	negative(#-1)
2	a byte string	010_xxxxx	bytes(n)
3	a text string	011_xxxxx	text(n)
4	an array of data items	100_xxxxx	array(n)
5	a map of pairs of data items	101_xxxxx	map(n)

¹ For negative(#-1), # represents the negative value minus 1. For example, negative(4) represents a value of -5.

⁵ For map(n), n represents number of key/value pairs.

Quick references

Unsigned integer

Number	Hex
0 .. 9	00 .. 09
10 .. 15	0A .. 0F
16 .. 23	10 .. 17
24 .. 255	18 18 .. 18 FF
256 .. 65535	19 0100 .. 19 FFFF
65536 .. 4294967295	1A 00010000 .. 1A FFFFFFFF

Negative integer

Number	Hex
-1 .. -10	20 .. 29
-11 .. -16	2A .. 2F
-17 .. -24	30 .. 37
-25 .. -256	38 18 .. 38 FF
-257 .. -65536	39 0100 .. 39 FFFF
-65537 .. -4294967296	3A 00010000 .. 3A FFFFFFFF

Byte string

Length	Hex
0 .. 9	40 .. 49
10 .. 15	4A .. 4F
16 .. 23	50 .. 57
24 .. 255	58 18 .. 58 FF
256 .. 65535	59 0100 .. 59 FFFF
65536 .. 4294967295	5A 00010000 .. 5A FFFFFFFF
Indefinite	5F

Text string

Length	Hex
0 .. 9	60 .. 69
10 .. 15	6A .. 6F
16 .. 23	70 .. 77
24 .. 255	78 18 .. 78 FF
256 .. 65535	79 0100 .. 79 FFFF
65536 .. 4294967295	7A 00010000 .. 7A FFFFFFFF
Indefinite	7F

Array

Length	Hex
0 .. 9	80 .. 89
10 .. 15	8A .. 8F
16 .. 23	90 .. 97
24 .. 255	98 18 .. 98 FF
256 .. 65535	99 0100 .. 99 FFFF
65536 .. 4294967295	9A 00010000 .. 9A FFFFFFFF
Indefinite	9F

Map

Length	Hex
0 .. 9	A0 .. A9
10 .. 15	AA .. AF
16 .. 23	B0 .. B7
24 .. 255	B8 18 .. B8 FF
256 .. 65535	B9 0100 .. B9 FFFF
65536 .. 4294967295	BA 00010000 .. BA FFFFFFFF
Indefinite	BF

Length represents number of key/value pairs.