function table2json(t)
	local function serialize(tbl)  
		local tmp = {}  
		for k, v in pairs(tbl) do  
			local k_type = type(k)  
			local v_type = type(v)  
			local key = (k_type == "string" and "\"" .. k .. "\":")  
				or (k_type == "number" and "")  
			local value = (v_type == "table" and serialize(v))  
                            or (v_type == "boolean" and tostring(v))  
                            or (v_type == "string" and "\"" .. v .. "\"")  
                            or (v_type == "number" and v)  
            tmp[#tmp + 1] = key and value and tostring(key) .. tostring(value) or nil  
    	end  
        if table.maxn(tbl) == 0 then  
            return "{" .. table.concat(tmp, ",") .. "}"  
        else  
            return "[" .. table.concat(tmp, ",") .. "]"  
    	end  
    end  

    return serialize(t)  
end