Build a Full Stack Nexmo App with Express and React

A developer can build a front-end application with React that controls conversations in real-time using the Nexmo Client SDK, which allows users to control elements of the conversation. The application is built on top of an Express server, which provides routes for managing users and other work. The full-stack app consists of two separate applications: one running on port 3001 (the Express server) and another on port 3000 (the React client). The Nexmo Client SDK is used to generate JWTs, create new users, and manage conversations in both the front-end and back-end applications. The application can be started using npm start, which starts the Express server and the React client concurrently.