Sort best match first fom Json list

[AsfaltoPesante]

I have a json list with these values
"John Brown", "John Smith","John","Simply John", "Mr. John" etc
what i'd like to achive is that no matter wher ein the json order is "John" the exact match always appear first then the others.
I've seen an example that works with list but it does not with json
ANy of you have ideas?