How to refresh the access token in aws amplify from front end react app ?

We have a react based front end app. It uses amplify in front end to interact with cognito. We use hosted cognito login page in our react web app. When we send the access token to backend api backed by API GW which uses cognito to authorize and authenticate. The issue is sometime the access is getting expired. It looks like the access token is available for 1 hour only.

How do we know whether the token is valid or not in front end code using aws amplify ? If it is expired, how do we use amplify sdk/api to refresh and get the new token without refreshing the page ?

Note:

• When we manually refresh the page, it is working.
• We want to perform the api call make it as a successful api call without asking the user to manually refresh the page.