Crack JWT HS256 with hashcat with Intel I9

[Jojo koko]

if you didnt specify an attackmask you test your hash versus an empty word, so your wordlist is just one empty string ''

?a means is one position all possible 95 ascii signs which is bruteforce, you have to provide a mask for bruteforce because you could also just bruteforce ?l which means just lower ascii chars

I thank you about your help but when I didn't set any attack mask ,hashcat find key like 1234 so it's really run

I don't know  what are all the options for HA256 but I want to run on all over the options, even not ascii
How can I do that please?

By the way I tried ?a?a?a?a?a?a?a?a
And I got
Minimum password length supported by kernel: 0
Maximum password length supported by kernel: 256

Hashes: 1 digests; 1 unique digests, 1 unique salts
Bitmaps: 16 bits, 65536 entries, 0x0000ffff mask, 262144 bytes, 5/13 rotates

Is that OK? why ascii chars are only 16 bits