Comment by zzo38computer

I prefer DER, which is also a binary format so it has the advantages of binary formats, too. (There is also BER, but in my opinion, DER is better.) I use DER in some programs, if the structured data format is useful. (Also, since text format is sometimes useful too, I had made up TER which is intended to be converted to DER. The DER file can be made in other ways as well and it is not required to use TER.)

(Also, standard ASN.1 does not have a key/value list type (which JSON and CBOR do have), but I had made up some nonstandard extensions to ASN.1 (called ASN.1X), including a few additional types, one of which is the key/value list type. Due to this, ASN.1X can now make a superset of the data that can be made by JSON (the only new type that is needed for this is the key/value list type; the other types of JSON are already standard ASN.1 types).)