> For the complete documentation index, see [llms.txt](https://shoppinpal.gitbook.io/docs-shoppinpal-com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://shoppinpal.gitbook.io/docs-shoppinpal-com/3.-the-backend/built-in-models.md).

# Built-in models

Let's first acclimate ourselves with where the built-in models live. Go have a peek at the `node_modules/loopback/common/models` directory.

Specifically, let's open up `node_modules/loopback/common/models/user.json`

Have a cursory glance, we could go into great details around the contents of this file and what everything means but lets leave that for a later exercise.