Mastering MEAN Web Development Expert Full Stack JavaScript (Video 31)

This video tutorial explains how to configure Socket.IO in a backend Express app to emit messages when a user logs in or a new master is added. It covers setting up the Express app to work with Socket.IO, using app.locals to make the Socket.IO instance available to controllers, and emitting messages to clients. The video also demonstrates testing the setup using the Socket.IO Tester Chrome extension.

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