How to use httpservice?

hs = game:GetService("HttpService")
test = hs:GetAsync("http://www.roproxy.tk/Asset/AvatarAccoutrements.ashx?userId=57686851", true)
print(test)

This one printed the body of the html

hs = game:GetService("HttpService")=
test = hs:GetAsync("http://www.roproxy.tk/Asset/AvatarAccoutrements.ashx?userId=57686851", true)
local Items = hs:JSONDecode(test)

when i tried to decode the JSON this error came out Can't parse JSON

now i want to use the data i obtained to turn it into a character changing appearance without dying is there a way to turn the data to a table?

There is a CharacterAppearance Property of Players might be more useful for this.

Now, to answer your question: Because it's in JSON, you first have to decode it into a Table, this can be done Via:

local URLs = {}
hs = game:GetService("HttpService")
test = hs:GetAsync("http://www.roproxy.tk/Asset/AvatarAccoutrements.ashx?userId=57686851", true)
for String in string.gmatch(test, "(.-);") do 
URLs[#URLS + 1] = String;
end