VALIDITY of Access token in facebook graph api

Question

如果我有一个访问令牌，我可以以某种方式解析它以知道它将在什么时间到期？

Answer 1

You can use Facebook's Debug Tool to check this if it's a small number of tokens

The expiry is also given to you along with the token at the point in the Authentication flow where you obtain the token itself - so ideally you'd store the expiry at that time and keep it up to date when you get a new token or extend the current token