very crude but minimal JSON encode/decode in LUA

json.lua

-- json parsing
function json_decode(msg)
   local js = {}
   for k,v in string.gmatch(msg,'"(%w+)":"(%w+)",') do
      js[k] = v;
   end
   for k,v in string.gmatch(msg,'"(%w+)":"(%w+)"}') do
      js[k] = v;
   end
   return js
end

function json_encode(map)
   local msg = "{"
   for k,v in pairs(map) do
      msg = msg..'"'..k..'":"'..v..'",'
   end
   return string.sub(msg,0,-2)..'}'
end