> For the complete documentation index, see [llms.txt](https://smu-portal.gitbook.io/get-started/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://smu-portal.gitbook.io/get-started/book-module-tutorial/backend.md).

# Backend

We will begin by defining our database models, then we will create the appropriate services that contain the business logic of our application. Following that, we will expose API routes to forward the supported requests (and any information encoded in request URLs) to the proper controller functions. Finally, we will test our new API routes using Postman.