maybe rename for consistency?
parse_nbt -> decode_nbt

then

decode_b64(string) -> string
encode_b64(string) -> string
decode_json(string) -> value
encode_json(value) -> string

wdym b64? also the json stuff would be pretty easy ngl, cos of parseJSON function in Value.java (or whatever it's called, I cant remember)

b64 == base64.