This tutorial guides users through setting up a chat application using Express.js, Nexmo's Node.js Server SDK, and Passport.js to authenticate users. The process starts with creating a new project, installing dependencies, and configuring Nexmo credentials. Users are then guided through creating a Typeform to capture user data, which is used to create a new user in the database and generate a JWT for authentication. The application also uses Ngrok to expose the local machine to the internet safely. Once users authenticate, they can join conversations and send messages. The tutorial concludes with tips on how to enhance the application further, including sending magic links via email, capturing display names and images, and implementing additional features such as revokable opaque strings, audio support, and shared media previews.