# Method Web.Auth.OAuth2.Base()->get_token_from_jwt()

Method get_token_from_jwt

  `string get_token_from_jwt(string jwt, string token_endpoint, string|void sub, void|function(bool, string:void) async_cb)`

Description

  Get an `access_token` from a JWT. http://jwt.io/

Parameter `jwt`

  JSON string.

Parameter `token_endpoint`

  URI to the request access_token endpoint.

Parameter `sub`

  Email/id of the requesting user.

Parameter `async_callback`

  If given the request will be made asynchronously. The signature is `callback(bool, string)`. If successful the second argument will be the result encoded with encode_value(), which can be stored and later used to populate an instance via set_from_cookie().