Implementing secure single sign-on authentication in NestJS

NestJS, a progressive Node.js framework, is used to build efficient, reliable, and scalable server-side applications, and this tutorial details implementing a secure Google single sign-on (SSO) in a NestJS backend service, integrating it with a React frontend application. The process involves setting up client and server folders, configuring a Google OAuth 2.0 project on the Google Cloud Platform, and managing state with Zustand. On the backend, developers configure NestJS to work with MongoDB to store user data and implement Google OAuth using the Google Auth Library. The tutorial demonstrates creating a user schema, enabling CORS for communication between the NestJS server and the React client, and implementing a login function to handle user authentication. The frontend uses the GoogleOAuthProvider and GoogleLogin APIs to log in users and send data to the backend, storing user information in local storage and displaying it using React components. The tutorial emphasizes secure handling of sensitive information through environment variables and showcases the integration's success by displaying user details upon login and storing them in a MongoDB database.