如何使用 JavaScript 获取当前登录的用户 ID

Question

I want to get the current logged-in userId. How can I do this with plain JavaScript?

I can do it with a get request that uses security claims in the backend with c#, but is there a better way?

Answer 1

Depending on the way how login is implemented... Assume that you use API's and JWT. So usually when you log in, you get a JWT assigned, it can already hold some of those details (depends on the end-point what you get). Use http://jwt.io and you'll see. There are then tools in the JavaScript world to decode a JWT and get those data. Anyhow, if you do a single additional call, then cache the result, that is just as fine, IMO. Also you usually store JWT in a localStorage or so, so those data are avail. all the time...