Well I use it, not that that means much :) Tried several "json replacement" formats (bson, cbor, msgpack, ion...) and json5 won by being the smallest after com

Well I use it, not that that means much :) Tried several "json replacement" formats (bson, cbor, msgpack, ion...) and json5 won by being the smallest after compression (on my data) while also having the nice bonus of retaining human-readability.