# Layer your app, keep Express within its boundaries

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 ### Separate component code into layers: web, services, and Data Access Layer (DAL)

![alt text](../../assets/images/structurebycomponents.PNG "Separate component code into layers")

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### 1 min explainer: The downside of mixing layers

![alt text](../../assets/images/keepexpressinweb.gif "The downside of mixing layers")