//引入jwt
const jwt = require("jsonwebtoken")

//创建一个对象
const obj = {
    name:"swk",
    age:18,
    gender:"男"
}

//使用jwt来对json数据进行加密
const token = jwt.sign(obj,"hellohellohowyou",{
    expiresIn:"1"  //过期时间
})
//console.log(token);

try{    
    //服务器收到客户端的token后
    //解密
    const decodeData = jwt.verify(token,"hellohellohowyou")
    console.log(decodeData);
}catch(e){
    //token解码失败，说明token无效
    console.log("无效的token");
}