How automatically getting token in Postman

I use the Postman desktop app for web API testing. I have a lot of controllers and for each need a token. First I get Bearer token and then copy it to other requests. This token have limit time. Can I get token automatically and then automatically set it to all others requests ?

ok, I just used Environments in postman.

1 - create new Environment with token.

2 - add test after auth request like this :

var jsonData = JSON.parse(responseBody);
var token = jsonData._token;
postman.setEnvironmentVariable("token", token);

3 - just set {{token}}

And of course you can set token before request if you use Pre-request Script in one of requests.