require("json")
result = {
    ["ip"]="192.168.0.177",
    ["date"]="2018-1-21",
         }

local test = assert(io.open("/tmp/abc.txt", "w"))
result = json.encode(result)
test:write(result)
test:close()


require("json")
local test = io.open("/tmp/abc.txt", "r")
local readjson= test:read("*a")
local table =json.decode(readjson)
test:close()
print("ip: " .. table["ip"])