Sharing data with unauthenticated users using Node js

This is a new area for me and don't know how to achieve this. I am developing a web app using Node.js in which I have some data stored into a database (PostgreSQL). I have a user who has created an account to access that data. Now, this user wants some way (eg. an URL which can be visited) to share that data with others without giving his credentials. How do I do this? After searching on Google for some ideas, I came across to something like RESTful API but have no idea if that is the way to go with or I need to do something else. Please, any suggestions on how I can achieve this would be greatly appreciated and what are the best practices to do so. Thanks.

via harsh