You should now have a better understanding of various data interchange formats such as JSON, BSON, XML, and YAML, and how they are used in web applications. You should understand the differences between SQL and NoSQL databases and what the advantages are of using one or the other depending on the needs of your application, and you have also learned about MongoDB and its use of BSON as a binary form of JSON. Additionally, you have learned about using web SPA container elements, and various methods of initializing and loading your app into that container.
These concepts are fundamental to understanding SPA development in general, and to understanding the inner workings of the MEAN stack and how it differs from other application development architectures.
Now that you have gotten a glimpse into the server side of a Node.js application and built a basic server with Express, let's go deeper into working with Express and learn about creating REST API requests for consumption within an SPA...