AltJSON

>> do http://reb4.me/r/altjson

>> to-json ["A" "block" of 6.0 Rebol #values]
== {["A","block","of",6.0,"Rebol","values"]}

>> probe load-json {{"foo":"bar","num":10,"null":null}}
make object! [
    foo: "bar"
    num: 10
    null: none
]

JSON.red

>> do %JSON.red

>> json/encode ["A" "block" of 6.0 Rebol #values]
== {["A","block","of",6.0,"Rebol","#values"]}

>> json/decode {{"foo":"bar","num":10,"null":null}}
== #(
    foo: "bar"
    num: 10
)