Welcome to the first step in building our Redis-based backend system. In this unit, we will focus on how to manage user data with expiration using Redis. This is a fundamental part of our project that will set the stage for more advanced features in later units. Each unit will focus on a specific aspect of the project, allowing you to build a complete system step by step.

Let's take a quick look at what you'll be building in this unit. We will focus on two key operations for managing user data:

1. Adding user data with an expiration time: This will ensure that user data is stored for a limited period and automatically deleted afterward.
2. Retrieving user data: This operation will help us fetch the user data we previously stored.

Here’s a quick example of how we will structure these operations:

Notice how in JavaScript, we use import to bring in the necessary module. We handle any connection errors using an event listener. We use JSON.stringify to convert data to a JSON string before storing it and then JSON.parse to convert it back to an object when retrieving it.