In this chapter, we are going to learn about what middleware is, look at different types of middleware, and learn about how they work. We are also going to extend our Redux store using the Saga middleware. We covered the concept of router middleware in Chapter 3, Routing.

In this chapter, we will cover the following topics:

• Learning about middleware and its related patterns
• Exploring the usage of redux-saga as middleware
• Outlining some further reading resources