Cognito User Pool: How to refresh Access Token using Refresh Token

Question

I am using Cognito user pool to authenticate users in my system. A successful authentication gives an ID Token (JWT), Access Token (JWT) and a Refresh

Answer 1

If you have a refresh token then you can get new access, id, and refresh token by just making this simple POST request to cognito:

POST https://mydomain.auth.us-east-1.amazoncognito.com/oauth2/token >
Content-Type='application/x-www-form-urlencoded'
Authorization=Basic aSdxd892iujendek328uedj

grant_type=refresh_token&
client_id=djc98u3jiedmi283eu928&
refresh_token=REFRESH_TOKEN

You will get the following response back:

HTTP/1.1 200 OK
Content-Type: application/json

{
   "access_token":"eyJz9sdfsdfsdfsd", 
   "refresh_token":"dn43ud8uj32nk2je",
   "id_token":"dmcxd329ujdmkemkd349r",
   "token_type":"Bearer", 
   "expires_in":3600
}