Creating a full-stack MERN app using JWT authentication: Part 2

The text outlines the process of implementing JWT (JSON Web Token) authentication within a full-stack MERN (MongoDB, Express.js, React, Node.js) application by creating a REST API-based server using Express.js. It details the necessary steps to export functions for the creation and validation of JWTs, and how to expose REST API endpoints for user authentication, including signing in, obtaining tokens, and signing out. The text emphasizes the importance of using Bearer authentication for secure token transmission over HTTPS and explains the syntax for the Authorization header. It also discusses the creation of Express.js server routes, the use of middleware like express.json() for parsing JSON payloads, and the organization of the code to handle API requests effectively. The document concludes with the implementation of API endpoints and suggests using tools like Postman for testing, while highlighting the future integration of client-side functionalities in the subsequent part of the series.