express如何获取请求头的cookie里面的expires 信息

Question

用了中间键cookie-parser但是依然获取不到cookie里面的expires信息

var express=require('express')
var app=express()
var cookieParser = require('cookie-parser')
app.use(cookieParser())
app.use(function(req,res){
    console.log(req.cookies)
    res.json(req.cookies)
})