The first complete real-time messaging workflow is now implemented.

Restart the backend if necessary and open the application in two browser windows.

Follow these steps:

1. Open the first browser window.
2. Enter username John.
3. Join the chat.
4. Open the second browser window.
5. Enter username Sarah.
6. Join the chat.
7. Send a message from John.
8. Verify that Sarah receives it immediately.
9. Send another message from Sarah.
10. Verify that John receives it.

Expected result:

Both clients should see the same messages without refreshing the browser.

At this stage, usernames are supplied by the browser and are not authenticated identities. We will discuss trusted identity and authentication in a later chapter.

Test Real-Time Messaging

Introduction to Socket.IO

Environment and Project Setup

Create the Express and Socket.IO Server

Connect the Browser to Socket.IO

Implement Real-Time Messaging

Master Socket.IO Events and Acknowledgements

Implement Socket.IO Rooms and Private Messaging

Socket.IO Authentication and Security

Connection Lifecycle and Reconnection

Testing and Troubleshooting

Scale Socket.IO Using Redis Adapter

Production Deployment and Best Practices

Receive and Display Messages in the Browser

Learn Socket.IO from scratch by building a real-time chat application with Express, rooms, private messaging, authentication, and Redis scaling.

Socket.IO with Node.js: Build a Complete Real-Time Chat Application

Test Real-Time Messaging - Socket.IO with Node.js: Build a Complete Real-Time Chat Application

Test Real-Time Messaging

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