Jira Oauth authentication behind screen using username and password in nodejs

I am working on Jira Oauth authentication using NodeJS, for this I am following this link: https://devup.co/jira-rest-api-oauth-authentication-in-node-js-2f8d226a493a

Now I am able to login and generate token using jira, but my requirement is different I have username and password so I don't need to show login popup window, because user is already login.

Is there any other way to generate OAuth token using username and password behind screen without showing login popup window??

via Sanjay