Help in completing user authentication via JWT Token on an Angular - nodejs application

This is an existing and fully functional enterprise application to which I have to add some features and fix some bugs. No www, internet access, used only on enterprise lan network. - Development on dedicated VPS server. 1) I have implemented a login page in my angular application, making use of a simple API call to check the correctness of username and password entered by the user. I have however bypassed the use of a jwt token, which I would like to add now. While the frontend is almost ok, I think we have to work on the backend part. I have already installed the npm package “jsonwebtoken” on nodejs. What i would like - JWT and expiration timestamp back to the client in the HTTP Response body and stored on Local Storage. Or suggest you, a best practice. - Error Message if authentication fails. - Put the username of authenticated user in navigation bar . 2) Add column filter in table 3) Find a more efficient solution for drag and drop lines/rows. It is likely that if I remain satisfied with the work you do, I will ask for further more complex and remunerative developments. More detailed information in the attached file.