How to make connection between frontend and backend while using jira server platform rest api for logging in my application

How to make connection between frontend and backend(session) while using jira server platform rest api for logging in my application. I am using spring boot in backend and I am quite stuck in this that how to make connection between my frontend and backend while using jira rest apis.

What libraries are you using on the front end? If you’re using straight AJS - you should be able to use jquery to make the appropriate Ajax calls.